Sync docs from v1.2.1.RELEASE to gh-pages
This commit is contained in:
Dave Syer
330
spring-cloud-bus/1.2.1.RELEASE/ghpages.sh
Normal file
330
spring-cloud-bus/1.2.1.RELEASE/ghpages.sh
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@@ -0,0 +1,330 @@
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#!/bin/bash -x
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set -e
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# Set default props like MAVEN_PATH, ROOT_FOLDER etc.
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function set_default_props() {
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# The script should be executed from the root folder
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ROOT_FOLDER=`pwd`
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echo "Current folder is ${ROOT_FOLDER}"
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if [[ ! -e "${ROOT_FOLDER}/.git" ]]; then
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echo "You're not in the root folder of the project!"
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exit 1
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fi
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# Prop that will let commit the changes
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COMMIT_CHANGES="no"
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MAVEN_PATH=${MAVEN_PATH:-}
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echo "Path to Maven is [${MAVEN_PATH}]"
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REPO_NAME=${PWD##*/}
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echo "Repo name is [${REPO_NAME}]"
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SPRING_CLOUD_STATIC_REPO=${SPRING_CLOUD_STATIC_REPO:-git@github.com:spring-cloud/spring-cloud-static.git}
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echo "Spring Cloud Static repo is [${SPRING_CLOUD_STATIC_REPO}"
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}
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# Check if gh-pages exists and docs have been built
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function check_if_anything_to_sync() {
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git remote set-url --push origin `git config remote.origin.url | sed -e 's/^git:/https:/'`
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if ! (git remote set-branches --add origin gh-pages && git fetch -q); then
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echo "No gh-pages, so not syncing"
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exit 0
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fi
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if ! [ -d docs/target/generated-docs ] && ! [ "${BUILD}" == "yes" ]; then
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echo "No gh-pages sources in docs/target/generated-docs, so not syncing"
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exit 0
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fi
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}
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function retrieve_current_branch() {
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# Code getting the name of the current branch. For master we want to publish as we did until now
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# http://stackoverflow.com/questions/1593051/how-to-programmatically-determine-the-current-checked-out-git-branch
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# If there is a branch already passed will reuse it - otherwise will try to find it
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CURRENT_BRANCH=${BRANCH}
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if [[ -z "${CURRENT_BRANCH}" ]] ; then
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CURRENT_BRANCH=$(git symbolic-ref -q HEAD)
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CURRENT_BRANCH=${CURRENT_BRANCH##refs/heads/}
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CURRENT_BRANCH=${CURRENT_BRANCH:-HEAD}
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fi
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echo "Current branch is [${CURRENT_BRANCH}]"
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git checkout ${CURRENT_BRANCH} || echo "Failed to check the branch... continuing with the script"
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}
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# Switches to the provided value of the release version. We always prefix it with `v`
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function switch_to_tag() {
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git checkout v${VERSION}
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}
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# Build the docs if switch is on
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function build_docs_if_applicable() {
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if [[ "${BUILD}" == "yes" ]] ; then
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./mvnw clean install -P docs -pl docs -DskipTests
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fi
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}
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# Get the name of the `docs.main` property
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# Get whitelisted branches - assumes that a `docs` module is available under `docs` profile
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function retrieve_doc_properties() {
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MAIN_ADOC_VALUE=$("${MAVEN_PATH}"mvn -q \
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-Dexec.executable="echo" \
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-Dexec.args='${docs.main}' \
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--non-recursive \
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org.codehaus.mojo:exec-maven-plugin:1.3.1:exec)
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echo "Extracted 'main.adoc' from Maven build [${MAIN_ADOC_VALUE}]"
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WHITELIST_PROPERTY=${WHITELIST_PROPERTY:-"docs.whitelisted.branches"}
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WHITELISTED_BRANCHES_VALUE=$("${MAVEN_PATH}"mvn -q \
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-Dexec.executable="echo" \
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-Dexec.args="\${${WHITELIST_PROPERTY}}" \
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org.codehaus.mojo:exec-maven-plugin:1.3.1:exec \
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-P docs \
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-pl docs)
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echo "Extracted '${WHITELIST_PROPERTY}' from Maven build [${WHITELISTED_BRANCHES_VALUE}]"
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}
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# Stash any outstanding changes
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function stash_changes() {
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git diff-index --quiet HEAD && dirty=$? || (echo "Failed to check if the current repo is dirty. Assuming that it is." && dirty="1")
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if [ "$dirty" != "0" ]; then git stash; fi
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}
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# Switch to gh-pages branch to sync it with current branch
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function add_docs_from_target() {
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local DESTINATION_REPO_FOLDER
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if [[ -z "${DESTINATION}" && -z "${CLONE}" ]] ; then
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DESTINATION_REPO_FOLDER=${ROOT_FOLDER}
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elif [[ "${CLONE}" == "yes" ]]; then
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mkdir -p ${ROOT_FOLDER}/target
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local clonedStatic=${ROOT_FOLDER}/target/spring-cloud-static
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if [[ ! -e "${clonedStatic}/.git" ]]; then
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echo "Cloning Spring Cloud Static to target"
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git clone ${SPRING_CLOUD_STATIC_REPO} ${clonedStatic} && git checkout gh-pages
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else
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echo "Spring Cloud Static already cloned - will pull changes"
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cd ${clonedStatic} && git checkout gh-pages && git pull origin gh-pages
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fi
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DESTINATION_REPO_FOLDER=${clonedStatic}/${REPO_NAME}
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mkdir -p ${DESTINATION_REPO_FOLDER}
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else
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if [[ ! -e "${DESTINATION}/.git" ]]; then
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echo "[${DESTINATION}] is not a git repository"
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exit 1
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fi
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DESTINATION_REPO_FOLDER=${DESTINATION}/${REPO_NAME}
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mkdir -p ${DESTINATION_REPO_FOLDER}
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echo "Destination was provided [${DESTINATION}]"
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fi
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cd ${DESTINATION_REPO_FOLDER}
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git checkout gh-pages
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git pull origin gh-pages
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# Add git branches
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###################################################################
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if [[ -z "${VERSION}" ]] ; then
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copy_docs_for_current_version
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else
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copy_docs_for_provided_version
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fi
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commit_changes_if_applicable
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}
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# Copies the docs by using the retrieved properties from Maven build
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function copy_docs_for_current_version() {
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if [[ "${CURRENT_BRANCH}" == "master" ]] ; then
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echo -e "Current branch is master - will copy the current docs only to the root folder"
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for f in docs/target/generated-docs/*; do
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file=${f#docs/target/generated-docs/*}
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if ! git ls-files -i -o --exclude-standard --directory | grep -q ^$file$; then
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# Not ignored...
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cp -rf $f ${ROOT_FOLDER}/
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git add -A ${ROOT_FOLDER}/$file
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fi
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done
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COMMIT_CHANGES="yes"
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else
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echo -e "Current branch is [${CURRENT_BRANCH}]"
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# http://stackoverflow.com/questions/29300806/a-bash-script-to-check-if-a-string-is-present-in-a-comma-separated-list-of-strin
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if [[ ",${WHITELISTED_BRANCHES_VALUE}," = *",${CURRENT_BRANCH},"* ]] ; then
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mkdir -p ${ROOT_FOLDER}/${CURRENT_BRANCH}
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echo -e "Branch [${CURRENT_BRANCH}] is whitelisted! Will copy the current docs to the [${CURRENT_BRANCH}] folder"
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for f in docs/target/generated-docs/*; do
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file=${f#docs/target/generated-docs/*}
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if ! git ls-files -i -o --exclude-standard --directory | grep -q ^$file$; then
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# Not ignored...
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# We want users to access 1.0.0.RELEASE/ instead of 1.0.0.RELEASE/spring-cloud.sleuth.html
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if [[ "${file}" == "${MAIN_ADOC_VALUE}.html" ]] ; then
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# We don't want to copy the spring-cloud-sleuth.html
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# we want it to be converted to index.html
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cp -rf $f ${ROOT_FOLDER}/${CURRENT_BRANCH}/index.html
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git add -A ${ROOT_FOLDER}/${CURRENT_BRANCH}/index.html
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else
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cp -rf $f ${ROOT_FOLDER}/${CURRENT_BRANCH}
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git add -A ${ROOT_FOLDER}/${CURRENT_BRANCH}/$file
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fi
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fi
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done
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COMMIT_CHANGES="yes"
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else
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echo -e "Branch [${CURRENT_BRANCH}] is not on the white list! Check out the Maven [${WHITELIST_PROPERTY}] property in
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[docs] module available under [docs] profile. Won't commit any changes to gh-pages for this branch."
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fi
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fi
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}
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# Copies the docs by using the explicitly provided version
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function copy_docs_for_provided_version() {
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local FOLDER=${DESTINATION_REPO_FOLDER}/${VERSION}
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mkdir -p ${FOLDER}
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echo -e "Current tag is [v${VERSION}] Will copy the current docs to the [${FOLDER}] folder"
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for f in ${ROOT_FOLDER}/docs/target/generated-docs/*; do
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file=${f#${ROOT_FOLDER}/docs/target/generated-docs/*}
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copy_docs_for_branch ${file} ${FOLDER}
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done
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COMMIT_CHANGES="yes"
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CURRENT_BRANCH="v${VERSION}"
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}
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# Copies the docs from target to the provided destination
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# Params:
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# $1 - file from target
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# $2 - destination to which copy the files
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function copy_docs_for_branch() {
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local file=$1
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local destination=$2
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if ! git ls-files -i -o --exclude-standard --directory | grep -q ^${file}$; then
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# Not ignored...
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# We want users to access 1.0.0.RELEASE/ instead of 1.0.0.RELEASE/spring-cloud.sleuth.html
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if [[ ("${file}" == "${MAIN_ADOC_VALUE}.html") || ("${file}" == "${REPO_NAME}.html") ]] ; then
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# We don't want to copy the spring-cloud-sleuth.html
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# we want it to be converted to index.html
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cp -rf $f ${destination}/index.html
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git add -A ${destination}/index.html
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else
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cp -rf $f ${destination}
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git add -A ${destination}/$file
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fi
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fi
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}
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function commit_changes_if_applicable() {
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if [[ "${COMMIT_CHANGES}" == "yes" ]] ; then
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COMMIT_SUCCESSFUL="no"
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git commit -a -m "Sync docs from ${CURRENT_BRANCH} to gh-pages" && COMMIT_SUCCESSFUL="yes" || echo "Failed to commit changes"
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# Uncomment the following push if you want to auto push to
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# the gh-pages branch whenever you commit to master locally.
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# This is a little extreme. Use with care!
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###################################################################
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if [[ "${COMMIT_SUCCESSFUL}" == "yes" ]] ; then
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git push origin gh-pages
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fi
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fi
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}
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# Switch back to the previous branch and exit block
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function checkout_previous_branch() {
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# If -version was provided we need to come back to root project
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cd ${ROOT_FOLDER}
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git checkout ${CURRENT_BRANCH} || echo "Failed to check the branch... continuing with the script"
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if [ "$dirty" != "0" ]; then git stash pop; fi
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exit 0
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}
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# Assert if properties have been properly passed
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function assert_properties() {
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echo "VERSION [${VERSION}], DESTINATION [${DESTINATION}], CLONE [${CLONE}]"
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if [[ "${VERSION}" != "" && (-z "${DESTINATION}" && -z "${CLONE}") ]] ; then echo "Version was set but destination / clone was not!"; exit 1;fi
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if [[ ("${DESTINATION}" != "" && "${CLONE}" != "") && -z "${VERSION}" ]] ; then echo "Destination / clone was set but version was not!"; exit 1;fi
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if [[ "${DESTINATION}" != "" && "${CLONE}" == "yes" ]] ; then echo "Destination and clone was set. Pick one!"; exit 1;fi
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}
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# Prints the usage
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function print_usage() {
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cat <<EOF
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The idea of this script is to update gh-pages branch with the generated docs. Without any options
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the script will work in the following manner:
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- if there's no gh-pages / target for docs module then the script ends
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- for master branch the generated docs are copied to the root of gh-pages branch
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- for any other branch (if that branch is whitelisted) a subfolder with branch name is created
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and docs are copied there
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- if the version switch is passed (-v) then a tag with (v) prefix will be retrieved and a folder
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with that version number will be created in the gh-pages branch. WARNING! No whitelist verification will take place
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- if the destination switch is passed (-d) then the script will check if the provided dir is a git repo and then will
|
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switch to gh-pages of that repo and copy the generated docs to `docs/<project-name>/<version>`
|
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- if the destination switch is passed (-d) then the script will check if the provided dir is a git repo and then will
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switch to gh-pages of that repo and copy the generated docs to `docs/<project-name>/<version>`
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USAGE:
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You can use the following options:
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-v|--version - the script will apply the whole procedure for a particular library version
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-d|--destination - the root of destination folder where the docs should be copied. You have to use the full path.
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E.g. point to spring-cloud-static folder. Can't be used with (-c)
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-b|--build - will run the standard build process after checking out the branch
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-c|--clone - will automatically clone the spring-cloud-static repo instead of providing the destination.
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Obviously can't be used with (-d)
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EOF
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}
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# ==========================================
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# ____ ____ _____ _____ _____ _______
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# / ____|/ ____| __ \|_ _| __ \__ __|
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# | (___ | | | |__) | | | | |__) | | |
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# \___ \| | | _ / | | | ___/ | |
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# ____) | |____| | \ \ _| |_| | | |
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# |_____/ \_____|_| \_\_____|_| |_|
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#
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# ==========================================
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while [[ $# > 0 ]]
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do
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key="$1"
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case ${key} in
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-v|--version)
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VERSION="$2"
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shift # past argument
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;;
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-d|--destination)
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DESTINATION="$2"
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shift # past argument
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;;
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-b|--build)
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BUILD="yes"
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;;
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-c|--clone)
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CLONE="yes"
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;;
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-h|--help)
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print_usage
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exit 0
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;;
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*)
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echo "Invalid option: [$1]"
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||||
print_usage
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exit 1
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;;
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||||
esac
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shift # past argument or value
|
||||
done
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||||
|
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assert_properties
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set_default_props
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check_if_anything_to_sync
|
||||
if [[ -z "${VERSION}" ]] ; then
|
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retrieve_current_branch
|
||||
else
|
||||
switch_to_tag
|
||||
fi
|
||||
build_docs_if_applicable
|
||||
retrieve_doc_properties
|
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stash_changes
|
||||
add_docs_from_target
|
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checkout_previous_branch
|
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696
spring-cloud-bus/1.2.1.RELEASE/index.html
Normal file
696
spring-cloud-bus/1.2.1.RELEASE/index.html
Normal file
@@ -0,0 +1,696 @@
|
||||
<!DOCTYPE html>
|
||||
<html lang="en">
|
||||
<head>
|
||||
<meta charset="UTF-8">
|
||||
<!--[if IE]><meta http-equiv="X-UA-Compatible" content="IE=edge"><![endif]-->
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1.0">
|
||||
<meta name="generator" content="Asciidoctor 1.5.3">
|
||||
<title>Spring Cloud Bus</title>
|
||||
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic%7CNoto+Serif:400,400italic,700,700italic%7CDroid+Sans+Mono:400,700">
|
||||
<style>
|
||||
/* Asciidoctor default stylesheet | MIT License | http://asciidoctor.org */
|
||||
/* Remove comment around @import statement below when using as a custom stylesheet */
|
||||
/*@import "https://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic%7CNoto+Serif:400,400italic,700,700italic%7CDroid+Sans+Mono:400,700";*/
|
||||
article,aside,details,figcaption,figure,footer,header,hgroup,main,nav,section,summary{display:block}
|
||||
audio,canvas,video{display:inline-block}
|
||||
audio:not([controls]){display:none;height:0}
|
||||
[hidden],template{display:none}
|
||||
script{display:none!important}
|
||||
html{font-family:sans-serif;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%}
|
||||
body{margin:0}
|
||||
a{background:transparent}
|
||||
a:focus{outline:thin dotted}
|
||||
a:active,a:hover{outline:0}
|
||||
h1{font-size:2em;margin:.67em 0}
|
||||
abbr[title]{border-bottom:1px dotted}
|
||||
b,strong{font-weight:bold}
|
||||
dfn{font-style:italic}
|
||||
hr{-moz-box-sizing:content-box;box-sizing:content-box;height:0}
|
||||
mark{background:#ff0;color:#000}
|
||||
code,kbd,pre,samp{font-family:monospace;font-size:1em}
|
||||
pre{white-space:pre-wrap}
|
||||
q{quotes:"\201C" "\201D" "\2018" "\2019"}
|
||||
small{font-size:80%}
|
||||
sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}
|
||||
sup{top:-.5em}
|
||||
sub{bottom:-.25em}
|
||||
img{border:0}
|
||||
svg:not(:root){overflow:hidden}
|
||||
figure{margin:0}
|
||||
fieldset{border:1px solid silver;margin:0 2px;padding:.35em .625em .75em}
|
||||
legend{border:0;padding:0}
|
||||
button,input,select,textarea{font-family:inherit;font-size:100%;margin:0}
|
||||
button,input{line-height:normal}
|
||||
button,select{text-transform:none}
|
||||
button,html input[type="button"],input[type="reset"],input[type="submit"]{-webkit-appearance:button;cursor:pointer}
|
||||
button[disabled],html input[disabled]{cursor:default}
|
||||
input[type="checkbox"],input[type="radio"]{box-sizing:border-box;padding:0}
|
||||
input[type="search"]{-webkit-appearance:textfield;-moz-box-sizing:content-box;-webkit-box-sizing:content-box;box-sizing:content-box}
|
||||
input[type="search"]::-webkit-search-cancel-button,input[type="search"]::-webkit-search-decoration{-webkit-appearance:none}
|
||||
button::-moz-focus-inner,input::-moz-focus-inner{border:0;padding:0}
|
||||
textarea{overflow:auto;vertical-align:top}
|
||||
table{border-collapse:collapse;border-spacing:0}
|
||||
*,*:before,*:after{-moz-box-sizing:border-box;-webkit-box-sizing:border-box;box-sizing:border-box}
|
||||
html,body{font-size:100%}
|
||||
body{background:#fff;color:rgba(0,0,0,.8);padding:0;margin:0;font-family:"Noto Serif","DejaVu Serif",serif;font-weight:400;font-style:normal;line-height:1;position:relative;cursor:auto}
|
||||
a:hover{cursor:pointer}
|
||||
img,object,embed{max-width:100%;height:auto}
|
||||
object,embed{height:100%}
|
||||
img{-ms-interpolation-mode:bicubic}
|
||||
.left{float:left!important}
|
||||
.right{float:right!important}
|
||||
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|
||||
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|
||||
</head>
|
||||
<body class="article">
|
||||
<div id="header">
|
||||
<h1>Spring Cloud Bus</h1>
|
||||
<div id="toc" class="toc">
|
||||
<div id="toctitle">Table of Contents</div>
|
||||
<ul class="sectlevel1">
|
||||
<li><a href="#_quick_start">Quick Start</a></li>
|
||||
<li><a href="#_addressing_an_instance">Addressing an Instance</a></li>
|
||||
<li><a href="#_addressing_all_instances_of_a_service">Addressing all instances of a service</a></li>
|
||||
<li><a href="#_application_context_id_must_be_unique">Application Context ID must be unique</a></li>
|
||||
<li><a href="#_customizing_the_message_broker">Customizing the Message Broker</a></li>
|
||||
<li><a href="#_tracing_bus_events">Tracing Bus Events</a></li>
|
||||
<li><a href="#_broadcasting_your_own_events">Broadcasting Your Own Events</a>
|
||||
<ul class="sectlevel2">
|
||||
<li><a href="#_registering_events_in_custom_packages">Registering events in custom packages</a></li>
|
||||
</ul>
|
||||
</li>
|
||||
</ul>
|
||||
</div>
|
||||
</div>
|
||||
<div id="content">
|
||||
<div id="preamble">
|
||||
<div class="sectionbody">
|
||||
<div class="paragraph">
|
||||
<p>Spring Cloud Bus links nodes of a distributed system with a lightweight message broker. This can then be used to broadcast state changes (e.g. configuration changes) or other management instructions. A key idea is that the Bus is like a distributed Actuator for a Spring Boot application that is scaled out, but it can also be used as a communication channel between apps. The only implementation currently is with an AMQP broker as the transport, but the same basic feature set (and some more depending on the transport) is on the roadmap for other transports.</p>
|
||||
</div>
|
||||
<div class="admonitionblock note">
|
||||
<table>
|
||||
<tr>
|
||||
<td class="icon">
|
||||
<div class="title">Note</div>
|
||||
</td>
|
||||
<td class="content">
|
||||
Spring Cloud is released under the non-restrictive Apache 2.0 license. If you would like to contribute to this section of the documentation or if you find an error, please find the source code and issue trackers in the project at <a href="https://github.com/spring-cloud/spring-cloud-config/tree/master/docs/src/main/asciidoc">github</a>.
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<div class="sect1">
|
||||
<h2 id="_quick_start">Quick Start</h2>
|
||||
<div class="sectionbody">
|
||||
<div class="paragraph">
|
||||
<p>Spring Cloud Bus works by adding Spring Boot autconfiguration if it detects itself on the classpath. All you need to do to enable the bus is to add <code>spring-cloud-starter-bus-amqp</code> or <code>spring-cloud-starter-bus-kafka</code> to your dependency management and Spring Cloud takes care of the rest. Make sure the broker (RabbitMQ or Kafka) is available and configured: running on localhost you shouldn’t have to do anything, but if you are running remotely use Spring Cloud Connectors, or Spring Boot conventions to define the broker credentials, e.g. for Rabbit</p>
|
||||
</div>
|
||||
<div class="listingblock">
|
||||
<div class="title">application.yml</div>
|
||||
<div class="content">
|
||||
<pre>spring:
|
||||
rabbitmq:
|
||||
host: mybroker.com
|
||||
port: 5672
|
||||
username: user
|
||||
password: secret</pre>
|
||||
</div>
|
||||
</div>
|
||||
<div class="paragraph">
|
||||
<p>The bus currently supports sending messages to all nodes listening or all nodes for a particular service (as defined by Eureka). More selector criteria may be added in the future (ie. only service X nodes in data center Y, etc…​). There are also some http endpoints under the <code>/bus/*</code> actuator namespace. There are currently two implemented. The first, <code>/bus/env</code>, sends key/value pairs to update each node’s Spring Environment. The second, <code>/bus/refresh</code>, will reload each application’s configuration, just as if they had all been pinged on their <code>/refresh</code> endpoint.</p>
|
||||
</div>
|
||||
<div class="admonitionblock note">
|
||||
<table>
|
||||
<tr>
|
||||
<td class="icon">
|
||||
<div class="title">Note</div>
|
||||
</td>
|
||||
<td class="content">
|
||||
The Bus starters cover Rabbit and Kafka, because those are the two most common implementations, but Spring Cloud Stream is quite flexible and binder will work combined with <code>spring-cloud-bus</code>.
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<div class="sect1">
|
||||
<h2 id="_addressing_an_instance">Addressing an Instance</h2>
|
||||
<div class="sectionbody">
|
||||
<div class="paragraph">
|
||||
<p>The HTTP endpoints accept a "destination" parameter, e.g. "/bus/refresh?destination=customers:9000", where the destination is an <code>ApplicationContext</code> ID. If the ID is owned by an instance on the Bus then it will process the message and all other instances will ignore it. Spring Boot sets the ID for you in the <code>ContextIdApplicationContextInitializer</code> to a combination of the <code>spring.application.name</code>, active profiles and <code>server.port</code> by default.</p>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<div class="sect1">
|
||||
<h2 id="_addressing_all_instances_of_a_service">Addressing all instances of a service</h2>
|
||||
<div class="sectionbody">
|
||||
<div class="paragraph">
|
||||
<p>The "destination" parameter is used in a Spring <code>PathMatcher</code> (with the path separator as a colon <code>:</code>) to determine if an instance will process the message. Using the example from above, "/bus/refresh?destination=customers:**" will target all instances of the "customers" service regardless of the profiles and ports set as the <code>ApplicationContext</code> ID.</p>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<div class="sect1">
|
||||
<h2 id="_application_context_id_must_be_unique">Application Context ID must be unique</h2>
|
||||
<div class="sectionbody">
|
||||
<div class="paragraph">
|
||||
<p>The bus tries to eliminate processing an event twice, once from the original <code>ApplicationEvent</code> and once from the queue. To do this, it checks the sending application context id againts the current application context id. If multiple instances of a service have the same application context id, events will not be processed. Running on a local machine, each service will be on a different port and that will be part of the application context id. Cloud Foundry supplies an index to differentiate. To ensure that the application context id is the unique, set <code>spring.application.index</code> to something unique for each instance of a service. For example, in lattice, set <code>spring.application.index=${INSTANCE_INDEX}</code> in application.properties (or bootstrap.properties if using configserver).</p>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<div class="sect1">
|
||||
<h2 id="_customizing_the_message_broker">Customizing the Message Broker</h2>
|
||||
<div class="sectionbody">
|
||||
<div class="paragraph">
|
||||
<p>Spring Cloud Bus uses
|
||||
<a href="https://cloud.spring.io/spring-cloud-stream">Spring Cloud Stream</a> to
|
||||
broadcast the messages so to get messages to flow you only need to
|
||||
include the binder implementation of your choice in the
|
||||
classpath. There are convenient starters specifically for the bus with
|
||||
AMQP (RabbitMQ) and Kafka
|
||||
(<code>spring-cloud-starter-bus-[amqp,kafka]</code>). Generally speaking
|
||||
Spring Cloud Stream relies on Spring Boot autoconfiguration
|
||||
conventions for configuring middleware, so for instance the AMQP
|
||||
broker address can be changed with <code>spring.rabbitmq.*</code>
|
||||
configuration properties. Spring Cloud Bus has a handful of native
|
||||
configuration properties in <code>spring.cloud.bus.*</code>
|
||||
(e.g. <code>spring.cloud.bus.destination</code> is the name of the topic to use
|
||||
the the externall middleware). Normally the defaults will suffice.</p>
|
||||
</div>
|
||||
<div class="paragraph">
|
||||
<p>To lean more about how to customize the message broker settings
|
||||
consult the Spring Cloud Stream documentation.</p>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<div class="sect1">
|
||||
<h2 id="_tracing_bus_events">Tracing Bus Events</h2>
|
||||
<div class="sectionbody">
|
||||
<div class="paragraph">
|
||||
<p>Bus events (subclasses of <code>RemoteApplicationEvent</code>) can be traced by
|
||||
setting <code>spring.cloud.bus.trace.enabled=true</code>. If you do this then the
|
||||
Spring Boot <code>TraceRepository</code> (if it is present) will show each event
|
||||
sent and all the acks from each service instance. Example (from the
|
||||
<code>/trace</code> endpoint):</p>
|
||||
</div>
|
||||
<div class="listingblock">
|
||||
<div class="content">
|
||||
<pre class="highlight"><code class="language-json" data-lang="json">{
|
||||
"timestamp": "2015-11-26T10:24:44.411+0000",
|
||||
"info": {
|
||||
"signal": "spring.cloud.bus.ack",
|
||||
"type": "RefreshRemoteApplicationEvent",
|
||||
"id": "c4d374b7-58ea-4928-a312-31984def293b",
|
||||
"origin": "stores:8081",
|
||||
"destination": "*:**"
|
||||
}
|
||||
},
|
||||
{
|
||||
"timestamp": "2015-11-26T10:24:41.864+0000",
|
||||
"info": {
|
||||
"signal": "spring.cloud.bus.sent",
|
||||
"type": "RefreshRemoteApplicationEvent",
|
||||
"id": "c4d374b7-58ea-4928-a312-31984def293b",
|
||||
"origin": "customers:9000",
|
||||
"destination": "*:**"
|
||||
}
|
||||
},
|
||||
{
|
||||
"timestamp": "2015-11-26T10:24:41.862+0000",
|
||||
"info": {
|
||||
"signal": "spring.cloud.bus.ack",
|
||||
"type": "RefreshRemoteApplicationEvent",
|
||||
"id": "c4d374b7-58ea-4928-a312-31984def293b",
|
||||
"origin": "customers:9000",
|
||||
"destination": "*:**"
|
||||
}
|
||||
}</code></pre>
|
||||
</div>
|
||||
</div>
|
||||
<div class="paragraph">
|
||||
<p>This trace shows that a <code>RefreshRemoteApplicationEvent</code> was sent from
|
||||
<code>customers:9000</code>, broadcast to all services, and it was received
|
||||
(acked) by <code>customers:9000</code> and <code>stores:8081</code>.</p>
|
||||
</div>
|
||||
<div class="paragraph">
|
||||
<p>To handle the ack signals yourself you could add an <code>@EventListener</code>
|
||||
for the <code>AckRemoteApplicationEvent</code> and <code>SentApplicationEvent</code> types
|
||||
to your app (and enable tracing). Or you could tap into the
|
||||
<code>TraceRepository</code> and mine the data from there.</p>
|
||||
</div>
|
||||
<div class="admonitionblock note">
|
||||
<table>
|
||||
<tr>
|
||||
<td class="icon">
|
||||
<div class="title">Note</div>
|
||||
</td>
|
||||
<td class="content">
|
||||
Any Bus application can trace acks, but sometimes it will be
|
||||
useful to do this in a central service that can do more complex
|
||||
queries on the data. Or forward it to a specialized tracing service.
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<div class="sect1">
|
||||
<h2 id="_broadcasting_your_own_events">Broadcasting Your Own Events</h2>
|
||||
<div class="sectionbody">
|
||||
<div class="paragraph">
|
||||
<p>The Bus can carry any event of type <code>RemoteApplicationEvent</code>, but the
|
||||
default transport is JSON and the deserializer needs to know which
|
||||
types are going to be used ahead of time. To register a new type it
|
||||
needs to be in a subpackage of <code>org.springframework.cloud.bus.event</code>.</p>
|
||||
</div>
|
||||
<div class="paragraph">
|
||||
<p>To customise the event name you can use <code>@JsonTypeName</code> on your custom class
|
||||
or rely on the default strategy which is to use the simple name of the class.
|
||||
Note that both the producer and the consumer will need access to the class
|
||||
definition.</p>
|
||||
</div>
|
||||
<div class="sect2">
|
||||
<h3 id="_registering_events_in_custom_packages">Registering events in custom packages</h3>
|
||||
<div class="paragraph">
|
||||
<p>If you cannot or don’t want to use a subpackage of <code>org.springframework.cloud.bus.event</code>
|
||||
for your custom events, you must specify which packages to scan for events of
|
||||
type <code>RemoteApplicationEvent</code> using <code>@RemoteApplicationEventScan</code>. Packages
|
||||
specified with <code>@RemoteApplicationEventScan</code> include subpackages.</p>
|
||||
</div>
|
||||
<div class="paragraph">
|
||||
<p>For example, if you have a custom event called <code>FooEvent</code>:</p>
|
||||
</div>
|
||||
<div class="listingblock">
|
||||
<div class="content">
|
||||
<pre class="highlight"><code class="language-java" data-lang="java">package com.acme;
|
||||
|
||||
public class FooEvent extends RemoteApplicationEvent {
|
||||
...
|
||||
}</code></pre>
|
||||
</div>
|
||||
</div>
|
||||
<div class="paragraph">
|
||||
<p>you can register this event with the deserializer in the following way:</p>
|
||||
</div>
|
||||
<div class="listingblock">
|
||||
<div class="content">
|
||||
<pre class="highlight"><code class="language-java" data-lang="java">package com.acme;
|
||||
|
||||
@Configuration
|
||||
@RemoteApplicationEventScan
|
||||
public class BusConfiguration {
|
||||
...
|
||||
}</code></pre>
|
||||
</div>
|
||||
</div>
|
||||
<div class="paragraph">
|
||||
<p>Without specifying a value, the package of the class where <code>@RemoteApplicationEventScan</code>
|
||||
is used will be registered. In this example <code>com.acme</code> will be registered using the
|
||||
package of <code>BusConfiguration</code>.</p>
|
||||
</div>
|
||||
<div class="paragraph">
|
||||
<p>You can also explicitly specify the packages to scan using the <code>value</code>, <code>basePackages</code> or
|
||||
<code>basePackageClasses</code> properties on <code>@RemoteApplicationEventScan</code>. For example:</p>
|
||||
</div>
|
||||
<div class="listingblock">
|
||||
<div class="content">
|
||||
<pre class="highlight"><code class="language-java" data-lang="java">package com.acme;
|
||||
|
||||
@Configuration
|
||||
//@RemoteApplicationEventScan({"com.acme", "foo.bar"})
|
||||
//@RemoteApplicationEventScan(basePackages = {"com.acme", "foo.bar", "fizz.buzz"})
|
||||
@RemoteApplicationEventScan(basePackageClasses = BusConfiguration.class)
|
||||
public class BusConfiguration {
|
||||
...
|
||||
}</code></pre>
|
||||
</div>
|
||||
</div>
|
||||
<div class="paragraph">
|
||||
<p>All examples of <code>@RemoteApplicationEventScan</code> above are equivalent,
|
||||
in that the <code>com.acme</code> package will be registered by explicitly specifying the
|
||||
packages on <code>@RemoteApplicationEventScan</code>. Note, you can specify multiple base
|
||||
packages to scan.</p>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
Reference in New Issue
Block a user