GH-422 Add initial set of Cloud Event samples

This commit adds initial set of samples and tests demonstrating various ways of how cloud event can be consumed (i.e., structured, bindary, pojo etc)

spring-cloud-function-context/src/main/java/org/springframework/cloud/function/context/config/CloudEventJsonMessageConverter.java

@@ -17,7 +17,6 @@
 package org.springframework.cloud.function.context.config;
 
 import java.lang.reflect.Type;
-import java.util.Collection;
 import java.util.Map;
 
 import org.springframework.cloud.function.json.JsonMapper;
@@ -34,7 +33,7 @@ import org.springframework.util.MimeType;
  *
  * @author Oleg Zhurakousky
  *
- * @since 3.1.0
+ * @since 3.1
  */
 public class CloudEventJsonMessageConverter extends JsonMessageConverter {
 
@@ -47,12 +46,17 @@ public class CloudEventJsonMessageConverter extends JsonMessageConverter {
 
 	@Override
 	protected Object convertFromInternal(Message<?> message, Class<?> targetClass, @Nullable Object conversionHint) {
-		Type convertToType = conversionHint == null ? targetClass : (Type) conversionHint;
-		String jsonString = (String) message.getPayload();
-		Map<String, Object> mapEvent = this.mapper.fromJson(jsonString, Map.class);
-		Object payload = this.mapper.fromJson(this.mapper.toJson(mapEvent.get("data")), convertToType);
-		mapEvent.remove("data");
-		return MessageBuilder.withPayload(payload).copyHeaders(mapEvent).build();
+		if (this.isBinary(message)) {
+			return super.convertFromInternal(message, targetClass, conversionHint);
+		}
+		else {
+			Type convertToType = conversionHint == null ? targetClass : (Type) conversionHint;
+			String jsonString = (String) message.getPayload();
+			Map<String, Object> mapEvent = this.mapper.fromJson(jsonString, Map.class);
+			Object payload = this.mapper.fromJson(this.mapper.toJson(mapEvent.get("data")), convertToType);
+			mapEvent.remove("data");
+			return MessageBuilder.withPayload(payload).copyHeaders(mapEvent).build();
+		}
 	}
 
 	@Override
@@ -61,4 +65,8 @@ public class CloudEventJsonMessageConverter extends JsonMessageConverter {
 		throw new UnsupportedOperationException("Temporarily not supported as this converter is work in progress");
 	}
 
+	private boolean isBinary(Message<?> message) {
+		Map<String, Object> headers = message.getHeaders();
+		return headers.containsKey("source") && headers.containsKey("specversion") && headers.containsKey("type");
+	}
 }

spring-cloud-function-samples/function-sample-cloudevent/.gitignore

@@ -0,0 +1,33 @@
+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

spring-cloud-function-samples/function-sample-cloudevent/.mvn/wrapper/MavenWrapperDownloader.java

@@ -0,0 +1,117 @@
+/*
+ * Copyright 2007-present the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import java.net.*;
+import java.io.*;
+import java.nio.channels.*;
+import java.util.Properties;
+
+public class MavenWrapperDownloader {
+
+    private static final String WRAPPER_VERSION = "0.5.6";
+    /**
+     * Default URL to download the maven-wrapper.jar from, if no 'downloadUrl' is provided.
+     */
+    private static final String DEFAULT_DOWNLOAD_URL = "https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/"
+        + WRAPPER_VERSION + "/maven-wrapper-" + WRAPPER_VERSION + ".jar";
+
+    /**
+     * Path to the maven-wrapper.properties file, which might contain a downloadUrl property to
+     * use instead of the default one.
+     */
+    private static final String MAVEN_WRAPPER_PROPERTIES_PATH =
+            ".mvn/wrapper/maven-wrapper.properties";
+
+    /**
+     * Path where the maven-wrapper.jar will be saved to.
+     */
+    private static final String MAVEN_WRAPPER_JAR_PATH =
+            ".mvn/wrapper/maven-wrapper.jar";
+
+    /**
+     * Name of the property which should be used to override the default download url for the wrapper.
+     */
+    private static final String PROPERTY_NAME_WRAPPER_URL = "wrapperUrl";
+
+    public static void main(String args[]) {
+        System.out.println("- Downloader started");
+        File baseDirectory = new File(args[0]);
+        System.out.println("- Using base directory: " + baseDirectory.getAbsolutePath());
+
+        // If the maven-wrapper.properties exists, read it and check if it contains a custom
+        // wrapperUrl parameter.
+        File mavenWrapperPropertyFile = new File(baseDirectory, MAVEN_WRAPPER_PROPERTIES_PATH);
+        String url = DEFAULT_DOWNLOAD_URL;
+        if(mavenWrapperPropertyFile.exists()) {
+            FileInputStream mavenWrapperPropertyFileInputStream = null;
+            try {
+                mavenWrapperPropertyFileInputStream = new FileInputStream(mavenWrapperPropertyFile);
+                Properties mavenWrapperProperties = new Properties();
+                mavenWrapperProperties.load(mavenWrapperPropertyFileInputStream);
+                url = mavenWrapperProperties.getProperty(PROPERTY_NAME_WRAPPER_URL, url);
+            } catch (IOException e) {
+                System.out.println("- ERROR loading '" + MAVEN_WRAPPER_PROPERTIES_PATH + "'");
+            } finally {
+                try {
+                    if(mavenWrapperPropertyFileInputStream != null) {
+                        mavenWrapperPropertyFileInputStream.close();
+                    }
+                } catch (IOException e) {
+                    // Ignore ...
+                }
+            }
+        }
+        System.out.println("- Downloading from: " + url);
+
+        File outputFile = new File(baseDirectory.getAbsolutePath(), MAVEN_WRAPPER_JAR_PATH);
+        if(!outputFile.getParentFile().exists()) {
+            if(!outputFile.getParentFile().mkdirs()) {
+                System.out.println(
+                        "- ERROR creating output directory '" + outputFile.getParentFile().getAbsolutePath() + "'");
+            }
+        }
+        System.out.println("- Downloading to: " + outputFile.getAbsolutePath());
+        try {
+            downloadFileFromURL(url, outputFile);
+            System.out.println("Done");
+            System.exit(0);
+        } catch (Throwable e) {
+            System.out.println("- Error downloading");
+            e.printStackTrace();
+            System.exit(1);
+        }
+    }
+
+    private static void downloadFileFromURL(String urlString, File destination) throws Exception {
+        if (System.getenv("MVNW_USERNAME") != null && System.getenv("MVNW_PASSWORD") != null) {
+            String username = System.getenv("MVNW_USERNAME");
+            char[] password = System.getenv("MVNW_PASSWORD").toCharArray();
+            Authenticator.setDefault(new Authenticator() {
+                @Override
+                protected PasswordAuthentication getPasswordAuthentication() {
+                    return new PasswordAuthentication(username, password);
+                }
+            });
+        }
+        URL website = new URL(urlString);
+        ReadableByteChannel rbc;
+        rbc = Channels.newChannel(website.openStream());
+        FileOutputStream fos = new FileOutputStream(destination);
+        fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
+        fos.close();
+        rbc.close();
+    }
+
+}

spring-cloud-function-samples/function-sample-cloudevent/.mvn/wrapper/maven-wrapper.properties

@@ -0,0 +1,2 @@
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.6.3/apache-maven-3.6.3-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar

spring-cloud-function-samples/function-sample-cloudevent/mvnw

@@ -0,0 +1,310 @@
+#!/bin/sh
+# ----------------------------------------------------------------------------
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# Maven Start Up Batch script
+#
+# Required ENV vars:
+# ------------------
+#   JAVA_HOME - location of a JDK home dir
+#
+# Optional ENV vars
+# -----------------
+#   M2_HOME - location of maven2's installed home dir
+#   MAVEN_OPTS - parameters passed to the Java VM when running Maven
+#     e.g. to debug Maven itself, use
+#       set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+#   MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+# ----------------------------------------------------------------------------
+
+if [ -z "$MAVEN_SKIP_RC" ] ; then
+
+  if [ -f /etc/mavenrc ] ; then
+    . /etc/mavenrc
+  fi
+
+  if [ -f "$HOME/.mavenrc" ] ; then
+    . "$HOME/.mavenrc"
+  fi
+
+fi
+
+# OS specific support.  $var _must_ be set to either true or false.
+cygwin=false;
+darwin=false;
+mingw=false
+case "`uname`" in
+  CYGWIN*) cygwin=true ;;
+  MINGW*) mingw=true;;
+  Darwin*) darwin=true
+    # Use /usr/libexec/java_home if available, otherwise fall back to /Library/Java/Home
+    # See https://developer.apple.com/library/mac/qa/qa1170/_index.html
+    if [ -z "$JAVA_HOME" ]; then
+      if [ -x "/usr/libexec/java_home" ]; then
+        export JAVA_HOME="`/usr/libexec/java_home`"
+      else
+        export JAVA_HOME="/Library/Java/Home"
+      fi
+    fi
+    ;;
+esac
+
+if [ -z "$JAVA_HOME" ] ; then
+  if [ -r /etc/gentoo-release ] ; then
+    JAVA_HOME=`java-config --jre-home`
+  fi
+fi
+
+if [ -z "$M2_HOME" ] ; then
+  ## resolve links - $0 may be a link to maven's home
+  PRG="$0"
+
+  # need this for relative symlinks
+  while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+      PRG="$link"
+    else
+      PRG="`dirname "$PRG"`/$link"
+    fi
+  done
+
+  saveddir=`pwd`
+
+  M2_HOME=`dirname "$PRG"`/..
+
+  # make it fully qualified
+  M2_HOME=`cd "$M2_HOME" && pwd`
+
+  cd "$saveddir"
+  # echo Using m2 at $M2_HOME
+fi
+
+# For Cygwin, ensure paths are in UNIX format before anything is touched
+if $cygwin ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --unix "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --unix "$CLASSPATH"`
+fi
+
+# For Mingw, ensure paths are in UNIX format before anything is touched
+if $mingw ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME="`(cd "$M2_HOME"; pwd)`"
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`"
+fi
+
+if [ -z "$JAVA_HOME" ]; then
+  javaExecutable="`which javac`"
+  if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then
+    # readlink(1) is not available as standard on Solaris 10.
+    readLink=`which readlink`
+    if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then
+      if $darwin ; then
+        javaHome="`dirname \"$javaExecutable\"`"
+        javaExecutable="`cd \"$javaHome\" && pwd -P`/javac"
+      else
+        javaExecutable="`readlink -f \"$javaExecutable\"`"
+      fi
+      javaHome="`dirname \"$javaExecutable\"`"
+      javaHome=`expr "$javaHome" : '\(.*\)/bin'`
+      JAVA_HOME="$javaHome"
+      export JAVA_HOME
+    fi
+  fi
+fi
+
+if [ -z "$JAVACMD" ] ; then
+  if [ -n "$JAVA_HOME"  ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+      # IBM's JDK on AIX uses strange locations for the executables
+      JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+      JAVACMD="$JAVA_HOME/bin/java"
+    fi
+  else
+    JAVACMD="`which java`"
+  fi
+fi
+
+if [ ! -x "$JAVACMD" ] ; then
+  echo "Error: JAVA_HOME is not defined correctly." >&2
+  echo "  We cannot execute $JAVACMD" >&2
+  exit 1
+fi
+
+if [ -z "$JAVA_HOME" ] ; then
+  echo "Warning: JAVA_HOME environment variable is not set."
+fi
+
+CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher
+
+# traverses directory structure from process work directory to filesystem root
+# first directory with .mvn subdirectory is considered project base directory
+find_maven_basedir() {
+
+  if [ -z "$1" ]
+  then
+    echo "Path not specified to find_maven_basedir"
+    return 1
+  fi
+
+  basedir="$1"
+  wdir="$1"
+  while [ "$wdir" != '/' ] ; do
+    if [ -d "$wdir"/.mvn ] ; then
+      basedir=$wdir
+      break
+    fi
+    # workaround for JBEAP-8937 (on Solaris 10/Sparc)
+    if [ -d "${wdir}" ]; then
+      wdir=`cd "$wdir/.."; pwd`
+    fi
+    # end of workaround
+  done
+  echo "${basedir}"
+}
+
+# concatenates all lines of a file
+concat_lines() {
+  if [ -f "$1" ]; then
+    echo "$(tr -s '\n' ' ' < "$1")"
+  fi
+}
+
+BASE_DIR=`find_maven_basedir "$(pwd)"`
+if [ -z "$BASE_DIR" ]; then
+  exit 1;
+fi
+
+##########################################################################################
+# Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+# This allows using the maven wrapper in projects that prohibit checking in binary data.
+##########################################################################################
+if [ -r "$BASE_DIR/.mvn/wrapper/maven-wrapper.jar" ]; then
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Found .mvn/wrapper/maven-wrapper.jar"
+    fi
+else
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Couldn't find .mvn/wrapper/maven-wrapper.jar, downloading it ..."
+    fi
+    if [ -n "$MVNW_REPOURL" ]; then
+      jarUrl="$MVNW_REPOURL/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar"
+    else
+      jarUrl="https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar"
+    fi
+    while IFS="=" read key value; do
+      case "$key" in (wrapperUrl) jarUrl="$value"; break ;;
+      esac
+    done < "$BASE_DIR/.mvn/wrapper/maven-wrapper.properties"
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Downloading from: $jarUrl"
+    fi
+    wrapperJarPath="$BASE_DIR/.mvn/wrapper/maven-wrapper.jar"
+    if $cygwin; then
+      wrapperJarPath=`cygpath --path --windows "$wrapperJarPath"`
+    fi
+
+    if command -v wget > /dev/null; then
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Found wget ... using wget"
+        fi
+        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+            wget "$jarUrl" -O "$wrapperJarPath"
+        else
+            wget --http-user=$MVNW_USERNAME --http-password=$MVNW_PASSWORD "$jarUrl" -O "$wrapperJarPath"
+        fi
+    elif command -v curl > /dev/null; then
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Found curl ... using curl"
+        fi
+        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+            curl -o "$wrapperJarPath" "$jarUrl" -f
+        else
+            curl --user $MVNW_USERNAME:$MVNW_PASSWORD -o "$wrapperJarPath" "$jarUrl" -f
+        fi
+
+    else
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Falling back to using Java to download"
+        fi
+        javaClass="$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.java"
+        # For Cygwin, switch paths to Windows format before running javac
+        if $cygwin; then
+          javaClass=`cygpath --path --windows "$javaClass"`
+        fi
+        if [ -e "$javaClass" ]; then
+            if [ ! -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+                if [ "$MVNW_VERBOSE" = true ]; then
+                  echo " - Compiling MavenWrapperDownloader.java ..."
+                fi
+                # Compiling the Java class
+                ("$JAVA_HOME/bin/javac" "$javaClass")
+            fi
+            if [ -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+                # Running the downloader
+                if [ "$MVNW_VERBOSE" = true ]; then
+                  echo " - Running MavenWrapperDownloader.java ..."
+                fi
+                ("$JAVA_HOME/bin/java" -cp .mvn/wrapper MavenWrapperDownloader "$MAVEN_PROJECTBASEDIR")
+            fi
+        fi
+    fi
+fi
+##########################################################################################
+# End of extension
+##########################################################################################
+
+export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"}
+if [ "$MVNW_VERBOSE" = true ]; then
+  echo $MAVEN_PROJECTBASEDIR
+fi
+MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS"
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --path --windows "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --windows "$CLASSPATH"`
+  [ -n "$MAVEN_PROJECTBASEDIR" ] &&
+    MAVEN_PROJECTBASEDIR=`cygpath --path --windows "$MAVEN_PROJECTBASEDIR"`
+fi
+
+# Provide a "standardized" way to retrieve the CLI args that will
+# work with both Windows and non-Windows executions.
+MAVEN_CMD_LINE_ARGS="$MAVEN_CONFIG $@"
+export MAVEN_CMD_LINE_ARGS
+
+WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+exec "$JAVACMD" \
+  $MAVEN_OPTS \
+  -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
+  "-Dmaven.home=${M2_HOME}" "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
+  ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@"

spring-cloud-function-samples/function-sample-cloudevent/mvnw.cmd

@@ -0,0 +1,182 @@
+@REM ----------------------------------------------------------------------------
+@REM Licensed to the Apache Software Foundation (ASF) under one
+@REM or more contributor license agreements.  See the NOTICE file
+@REM distributed with this work for additional information
+@REM regarding copyright ownership.  The ASF licenses this file
+@REM to you under the Apache License, Version 2.0 (the
+@REM "License"); you may not use this file except in compliance
+@REM with the License.  You may obtain a copy of the License at
+@REM
+@REM    https://www.apache.org/licenses/LICENSE-2.0
+@REM
+@REM Unless required by applicable law or agreed to in writing,
+@REM software distributed under the License is distributed on an
+@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@REM KIND, either express or implied.  See the License for the
+@REM specific language governing permissions and limitations
+@REM under the License.
+@REM ----------------------------------------------------------------------------
+
+@REM ----------------------------------------------------------------------------
+@REM Maven Start Up Batch script
+@REM
+@REM Required ENV vars:
+@REM JAVA_HOME - location of a JDK home dir
+@REM
+@REM Optional ENV vars
+@REM M2_HOME - location of maven2's installed home dir
+@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
+@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a keystroke before ending
+@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
+@REM     e.g. to debug Maven itself, use
+@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+@REM ----------------------------------------------------------------------------
+
+@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
+@echo off
+@REM set title of command window
+title %0
+@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on'
+@if "%MAVEN_BATCH_ECHO%" == "on"  echo %MAVEN_BATCH_ECHO%
+
+@REM set %HOME% to equivalent of $HOME
+if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
+
+@REM Execute a user defined script before this one
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
+@REM check for pre script, once with legacy .bat ending and once with .cmd ending
+if exist "%HOME%\mavenrc_pre.bat" call "%HOME%\mavenrc_pre.bat"
+if exist "%HOME%\mavenrc_pre.cmd" call "%HOME%\mavenrc_pre.cmd"
+:skipRcPre
+
+@setlocal
+
+set ERROR_CODE=0
+
+@REM To isolate internal variables from possible post scripts, we use another setlocal
+@setlocal
+
+@REM ==== START VALIDATION ====
+if not "%JAVA_HOME%" == "" goto OkJHome
+
+echo.
+echo Error: JAVA_HOME not found in your environment. >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+:OkJHome
+if exist "%JAVA_HOME%\bin\java.exe" goto init
+
+echo.
+echo Error: JAVA_HOME is set to an invalid directory. >&2
+echo JAVA_HOME = "%JAVA_HOME%" >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+@REM ==== END VALIDATION ====
+
+:init
+
+@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
+@REM Fallback to current working directory if not found.
+
+set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
+IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
+
+set EXEC_DIR=%CD%
+set WDIR=%EXEC_DIR%
+:findBaseDir
+IF EXIST "%WDIR%"\.mvn goto baseDirFound
+cd ..
+IF "%WDIR%"=="%CD%" goto baseDirNotFound
+set WDIR=%CD%
+goto findBaseDir
+
+:baseDirFound
+set MAVEN_PROJECTBASEDIR=%WDIR%
+cd "%EXEC_DIR%"
+goto endDetectBaseDir
+
+:baseDirNotFound
+set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
+cd "%EXEC_DIR%"
+
+:endDetectBaseDir
+
+IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
+
+@setlocal EnableExtensions EnableDelayedExpansion
+for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
+@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
+
+:endReadAdditionalConfig
+
+SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
+set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar"
+set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+set DOWNLOAD_URL="https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar"
+
+FOR /F "tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
+    IF "%%A"=="wrapperUrl" SET DOWNLOAD_URL=%%B
+)
+
+@REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+@REM This allows using the maven wrapper in projects that prohibit checking in binary data.
+if exist %WRAPPER_JAR% (
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Found %WRAPPER_JAR%
+    )
+) else (
+    if not "%MVNW_REPOURL%" == "" (
+        SET DOWNLOAD_URL="%MVNW_REPOURL%/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar"
+    )
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Couldn't find %WRAPPER_JAR%, downloading it ...
+        echo Downloading from: %DOWNLOAD_URL%
+    )
+
+    powershell -Command "&{"^
+		"$webclient = new-object System.Net.WebClient;"^
+		"if (-not ([string]::IsNullOrEmpty('%MVNW_USERNAME%') -and [string]::IsNullOrEmpty('%MVNW_PASSWORD%'))) {"^
+		"$webclient.Credentials = new-object System.Net.NetworkCredential('%MVNW_USERNAME%', '%MVNW_PASSWORD%');"^
+		"}"^
+		"[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $webclient.DownloadFile('%DOWNLOAD_URL%', '%WRAPPER_JAR%')"^
+		"}"
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Finished downloading %WRAPPER_JAR%
+    )
+)
+@REM End of extension
+
+@REM Provide a "standardized" way to retrieve the CLI args that will
+@REM work with both Windows and non-Windows executions.
+set MAVEN_CMD_LINE_ARGS=%*
+
+%MAVEN_JAVA_EXE% %JVM_CONFIG_MAVEN_PROPS% %MAVEN_OPTS% %MAVEN_DEBUG_OPTS% -classpath %WRAPPER_JAR% "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %*
+if ERRORLEVEL 1 goto error
+goto end
+
+:error
+set ERROR_CODE=1
+
+:end
+@endlocal & set ERROR_CODE=%ERROR_CODE%
+
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPost
+@REM check for post script, once with legacy .bat ending and once with .cmd ending
+if exist "%HOME%\mavenrc_post.bat" call "%HOME%\mavenrc_post.bat"
+if exist "%HOME%\mavenrc_post.cmd" call "%HOME%\mavenrc_post.cmd"
+:skipRcPost
+
+@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
+if "%MAVEN_BATCH_PAUSE%" == "on" pause
+
+if "%MAVEN_TERMINATE_CMD%" == "on" exit %ERROR_CODE%
+
+exit /B %ERROR_CODE%

spring-cloud-function-samples/function-sample-cloudevent/pom.xml

@@ -0,0 +1,65 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>2.3.5.RELEASE</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>io.spring.sample</groupId>
+	<artifactId>function-sample-cloudevent</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>function-sample-cloudevent</name>
+	<description>Demo project for Spring Boot</description>
+
+	<properties>
+		<java.version>8</java.version>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+        
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-function-web</artifactId>
+            <version>3.1.0-SNAPSHOT</version>
+        </dependency>
+        
+<!--         <dependency> -->
+<!--             <groupId>org.springframework.cloud</groupId> -->
+<!--             <artifactId>spring-cloud-stream-binder-rabbit</artifactId> -->
+<!--             <version>3.1.0-SNAPSHOT</version> -->
+<!--         </dependency> -->
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+			<exclusions>
+				<exclusion>
+					<groupId>org.junit.vintage</groupId>
+					<artifactId>junit-vintage-engine</artifactId>
+				</exclusion>
+			</exclusions>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

spring-cloud-function-samples/function-sample-cloudevent/src/main/java/io/spring/cloudevent/CloudeventDemoApplication.java

@@ -0,0 +1,101 @@
+/*
+ * Copyright 2020-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.spring.cloudevent;
+
+import java.util.function.Function;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.messaging.Message;
+
+/**
+ * Sample application that demonstrates how user functions can be triggered by cloud event.
+ * Events can come from anywhere (e.g., HTTP, Messaging, RSocket etc).
+ * Given that this particular sample comes already with spring-cloud-function-web support each
+ * function is a valid REST endpoint where function name signifies URL path (e.g., http://localhost:8080/asPOJOMessage).
+ *
+ * Simply start the application and post cloud event to individual function - (see individual 'curl' command at each function).
+ *
+ * You can also run CloudeventDemoApplicationTests.
+ *
+ * @author Oleg Zhurakousky
+ *
+ */
+@SpringBootApplication
+public class CloudeventDemoApplication {
+
+	public static void main(String[] args) throws Exception {
+	    SpringApplication.run(CloudeventDemoApplication.class, args);
+	}
+
+	/*
+	 * curl -w'\n' localhost:8080/asStringMessage \
+ 	 * -H "Ce-Specversion: 1.0" \
+ 	 * -H "Ce-Type: com.example.springevent" \
+ 	 * -H "Ce-Source: spring.io/spring-event" \
+ 	 * -H "Content-Type: application/json" \
+ 	 * -H "Ce-Id: 0001" \
+ 	 * -d '{"releaseDate":"2004-03-24", "releaseName":"Spring Framework", "version":"1.0"}'
+	 */
+	@Bean
+	public Function<Message<String>, String> asStringMessage() {
+		return v -> v.getPayload().toString();
+	}
+
+	/*
+	 * curl -w'\n' localhost:8080/asString \
+ 	 * -H "Ce-Specversion: 1.0" \
+ 	 * -H "Ce-Type: com.example.springevent" \
+ 	 * -H "Ce-Source: spring.io/spring-event" \
+ 	 * -H "Content-Type: application/json" \
+ 	 * -H "Ce-Id: 0001" \
+ 	 * -d '{"releaseDate":"2004-03-24", "releaseName":"Spring Framework", "version":"1.0"}'
+	 */
+	@Bean
+	public Function<String, String> asString() {
+		return v -> v;
+	}
+
+	/*
+	 * curl -w'\n' localhost:8080/asPOJOMessage \
+ 	 * -H "Ce-Specversion: 1.0" \
+ 	 * -H "Ce-Type: com.example.springevent" \
+ 	 * -H "Ce-Source: spring.io/spring-event" \
+ 	 * -H "Content-Type: application/json" \
+ 	 * -H "Ce-Id: 0001" \
+ 	 * -d '{"releaseDate":"2004-03-24", "releaseName":"Spring Framework", "version":"1.0"}'
+	 */
+	@Bean
+	public Function<Message<SpringReleaseEvent>, String> asPOJOMessage() {
+		return v -> v.getPayload().toString();
+	}
+
+	/*
+	 * curl -w'\n' localhost:8080/asPOJO \
+ 	 * -H "Ce-Specversion: 1.0" \
+ 	 * -H "Ce-Type: com.example.springevent" \
+ 	 * -H "Ce-Source: spring.io/spring-event" \
+ 	 * -H "Content-Type: application/json" \
+ 	 * -H "Ce-Id: 0001" \
+ 	 * -d '{"releaseDate":"2004-03-24", "releaseName":"Spring Framework", "version":"1.0"}'
+	 */
+	@Bean
+	public Function<SpringReleaseEvent, String> asPOJO() {
+		return v -> v.toString();
+	}
+}

spring-cloud-function-samples/function-sample-cloudevent/src/main/java/io/spring/cloudevent/SpringReleaseEvent.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2020-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.spring.cloudevent;
+
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+import com.fasterxml.jackson.annotation.JsonFormat;
+
+/**
+ * An example POJO that represents cloud event data
+ *
+ * @author Oleg Zhurakousky
+ *
+ */
+public class SpringReleaseEvent {
+
+	@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "dd-MM-yyyy")
+	private Date releaseDate;
+
+	private String releaseName;
+
+	private String version;
+
+	public Date getReleaseDate() {
+		return releaseDate;
+	}
+
+	public void setReleaseDate(Date releaseDate) {
+		this.releaseDate = releaseDate;
+	}
+
+	public String getReleaseName() {
+		return releaseName;
+	}
+
+	public void setReleaseName(String releaseName) {
+		this.releaseName = releaseName;
+	}
+
+	public String getVersion() {
+		return version;
+	}
+
+	public void setVersion(String version) {
+		this.version = version;
+	}
+
+	@Override
+	public String toString() {
+		return "releaseDate:" + new SimpleDateFormat("dd-MM-yyyy").format(releaseDate) + "; releaseName:" + releaseName + "; version:" + version;
+	}
+}

spring-cloud-function-samples/function-sample-cloudevent/src/main/resources/application.properties

@@ -0,0 +1 @@
+

spring-cloud-function-samples/function-sample-cloudevent/src/test/java/io/spring/cloudevent/CloudeventDemoApplicationTests.java

@@ -0,0 +1,254 @@
+/*
+ * Copyright 2020-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.spring.cloudevent;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.net.URI;
+import java.text.SimpleDateFormat;
+import java.util.UUID;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.cloud.function.context.config.CloudEventJsonMessageConverter;
+import org.springframework.cloud.function.json.JsonMapper;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.MediaType;
+import org.springframework.http.RequestEntity;
+import org.springframework.http.ResponseEntity;
+import org.springframework.lang.Nullable;
+import org.springframework.messaging.Message;
+import org.springframework.messaging.MessageHeaders;
+import org.springframework.messaging.converter.MessageConverter;
+import org.springframework.util.SocketUtils;
+
+/**
+ *
+ * @author Oleg Zhurakousky
+ *
+ */
+public class CloudeventDemoApplicationTests {
+
+	private TestRestTemplate testRestTemplate = new TestRestTemplate();
+
+	@BeforeEach
+	public void init() throws Exception {
+		System.setProperty("server.port", String.valueOf(SocketUtils.findAvailableTcpPort()));
+	}
+
+	/*
+	 * This test demonstrates consumption of Cloud Event via HTTP POST - binary-mode message.
+	 * According to specification - https://github.com/cloudevents/spec/blob/v1.0/spec.md
+	 * 	- A "binary-mode message" is one where the event data is stored in the message body,
+	 *    and event attributes are stored as part of message meta-data.
+	 *
+	 * The above means that it fits perfectly with Spring Message model and as such there is
+	 * absolutely nothing that needs to be done at the framework or user level to consume it.
+	 * It just works!
+	 *
+	 * The example demonstrated via two types of functions
+	 *  - Function<Message<String>, String> asBinaryViaMessage;
+	 *  - Function<String, String> asJustBinary;
+	 */
+	@Test
+	public void testAsBinaryMessageViaHTTP() throws Exception {
+		SpringApplication.run(CloudeventDemoApplication.class);
+		HttpHeaders headers = this.buildHeaders(MediaType.APPLICATION_JSON);
+		// will work with either content type
+//		HttpHeaders headers = this.buildHeaders(MediaType.valueOf("application/cloudevents+json;charset=utf-8"));
+
+		String payload = "{\"releaseDate\":\"2004-03-24\", \"releaseName\":\"Spring Framework\", \"version\":\"1.0\"}";
+
+		RequestEntity<String> re = new RequestEntity<>(payload, headers, HttpMethod.POST, this.constructURI("/asStringMessage"));
+		ResponseEntity<String> response = testRestTemplate.exchange(re, String.class);
+
+		assertThat(response.getBody()).isEqualTo(payload);
+
+		re = new RequestEntity<>(payload, headers, HttpMethod.POST, this.constructURI("/asString"));
+		response = testRestTemplate.exchange(re, String.class);
+
+		assertThat(response.getBody()).isEqualTo(payload);
+	}
+
+	/*
+	 * The same as the previous two tests with the exception that cloud event data de-serialized into POJO.
+	 * Again, given that abstractions for transparent type conversion already part of the Spring ecosystem nothing
+	 * needed to be done at the framework or user level to consume it.
+	 * It just works!
+	 */
+	@Test
+	public void testAsBinaryPOJOMessageViaHTTP() throws Exception {
+		SpringApplication.run(CloudeventDemoApplication.class);
+
+		HttpHeaders headers = this.buildHeaders(MediaType.APPLICATION_JSON);
+		String payload = "{\"releaseDate\":\"24-03-2004\", \"releaseName\":\"Spring Framework\", \"version\":\"1.0\"}";
+
+		RequestEntity<String> re = new RequestEntity<>(payload, headers, HttpMethod.POST, this.constructURI("/asPOJOMessage"));
+		ResponseEntity<String> response = testRestTemplate.exchange(re, String.class);
+
+		assertThat(response.getBody()).isEqualTo("releaseDate:24-03-2004; releaseName:Spring Framework; version:1.0");
+
+		re = new RequestEntity<>(payload, headers, HttpMethod.POST, this.constructURI("/asPOJO"));
+		response = testRestTemplate.exchange(re, String.class);
+
+		assertThat(response.getBody()).isEqualTo("releaseDate:24-03-2004; releaseName:Spring Framework; version:1.0");
+	}
+
+	/*
+	 * This test demonstrates parsing of cloud event out of provided 'datacontenttype'
+	 * using custom message converter which supports imaginary "contentType=foo/bar".
+	 *
+	 */
+	@Test
+	public void testAsBinaryPOJOMessageViaHTTPCustomDataType() throws Exception {
+		SpringApplication.run(new Class[] {CloudeventDemoApplication.class, FooBarConverterConfiguration.class}, new String[] {});
+
+		HttpHeaders headers = this.buildHeaders(MediaType.valueOf("application/cloudevents+json;charset=utf-8"));
+		headers.set("datacontenttype", "foo/bar");
+		String payload = "24-03-2004:Spring Framework:1.0";
+
+		RequestEntity<String> re = new RequestEntity<>(payload, headers, HttpMethod.POST, this.constructURI("/asPOJOMessage"));
+		ResponseEntity<String> response = testRestTemplate.exchange(re, String.class);
+
+		assertThat(response.getBody()).isEqualTo("releaseDate:24-03-2004; releaseName:Spring Framework; version:1.0");
+	}
+
+	/*
+	 * This test demonstrates sending structured
+	 */
+	@Test
+    public void testAsStracturalFormatToPOJO() throws Exception {
+        SpringApplication.run(CloudeventDemoApplication.class);
+
+        String payload = "{\n" +
+                "    \"specversion\" : \"1.0\",\n" +
+                "    \"type\" : \"org.springframework\",\n" +
+                "    \"source\" : \"https://spring.io/\",\n" +
+                "    \"id\" : \"A234-1234-1234\",\n" +
+                "    \"datacontenttype\" : \"application/json\",\n" +
+                "    \"data\" : {\n" +
+                "        \"version\" : \"1.0\",\n" +
+                "        \"releaseName\" : \"Spring Framework\",\n" +
+                "        \"releaseDate\" : \"24-03-2004\"\n" +
+                "    }\n" +
+                "}";
+
+        HttpHeaders headers = new HttpHeaders();
+        headers.setContentType(MediaType.valueOf("application/cloudevents+json;charset=utf-8"));
+
+        RequestEntity<String> re = new RequestEntity<>(payload, headers, HttpMethod.POST, this.constructURI("/asPOJOMessage"));
+        ResponseEntity<String> response = testRestTemplate.exchange(re, String.class);
+
+        assertThat(response.getBody()).isEqualTo("releaseDate:24-03-2004; releaseName:Spring Framework; version:1.0");
+
+        re = new RequestEntity<>(payload, headers, HttpMethod.POST, this.constructURI("/asPOJO"));
+		response = testRestTemplate.exchange(re, String.class);
+
+		assertThat(response.getBody()).isEqualTo("releaseDate:24-03-2004; releaseName:Spring Framework; version:1.0");
+    }
+
+
+	@Configuration
+	public static class FooBarConverterConfiguration {
+		@Bean
+		public MessageConverter foobar(JsonMapper jsonMapper) {
+			return new FooBarToCloudEventMessageConverter(jsonMapper);
+		}
+	}
+
+	public static class FooBarToCloudEventMessageConverter extends CloudEventJsonMessageConverter {
+
+		public FooBarToCloudEventMessageConverter(JsonMapper jsonMapper) {
+			super(jsonMapper);
+		}
+
+		@Override
+		protected boolean supports(Class<?> clazz) {
+			throw new UnsupportedOperationException();
+		}
+
+		@Override
+		protected boolean canConvertTo(Object payload, @Nullable MessageHeaders headers) {
+			if (!supportsMimeType(headers)) {
+				return false;
+			}
+			return true;
+		}
+		@Override
+		protected boolean canConvertFrom(Message<?> message, @Nullable Class<?> targetClass) {
+			if (targetClass == null || !supportsMimeType(message.getHeaders())) {
+				return false;
+			}
+			else if (message.getHeaders().containsKey("datacontenttype") && message.getHeaders().get("datacontenttype").equals("foo/bar")) {
+				return true;
+			}
+			return false;
+		}
+
+		@Override
+		protected Object convertFromInternal(Message<?> message, Class<?> targetClass, @Nullable Object conversionHint) {
+			if (message.getHeaders().containsKey("datacontenttype")
+					&& message.getHeaders().get("datacontenttype").equals("foo/bar")
+					&& SpringReleaseEvent.class == targetClass) {
+				SpringReleaseEvent event = new SpringReleaseEvent();
+				String[] data = ((String) message.getPayload()).split(":");
+				SimpleDateFormat df = new SimpleDateFormat("dd-MM-yyyy");
+				try {
+					event.setReleaseDate(df.parse(data[0].trim()));
+				}
+				catch (Exception e) {
+					throw new IllegalArgumentException("Failed to convert date", e);
+				}
+				event.setReleaseName(data[1]);
+				event.setVersion(data[2]);
+				return event;
+			}
+			else {
+				return super.convertFromInternal(message, targetClass, conversionHint);
+			}
+		}
+
+		@Override
+		protected Object convertToInternal(Object payload, @Nullable MessageHeaders headers,
+				@Nullable Object conversionHint) {
+
+			return null;
+
+		}
+	}
+
+	private URI constructURI(String path) throws Exception {
+		return new URI("http://localhost:" + System.getProperty("server.port") + path);
+	}
+
+	private HttpHeaders buildHeaders(MediaType contentType) {
+		HttpHeaders headers = new HttpHeaders();
+		headers.setContentType(contentType);
+		headers.set("id", UUID.randomUUID().toString());
+		headers.set("source", "https://spring.io/");
+		headers.set("specversion", "1.0");
+		headers.set("type", "org.springframework");
+		return headers;
+	}
+
+}

spring-cloud-function-samples/pom.xml

@@ -24,6 +24,7 @@
 		<module>function-sample-spring-integration</module>
 		<module>function-sample-gcp-http</module>
  		<module>function-sample-gcp-background</module>
+ 		<module>function-sample-cloudevent</module>
 	</modules>
 
 	<build>