b1a3ca764c
JIRA: https://jira.spring.io/browse/INT-4433 The current `MessagePublishingInterceptor` behavior is to parse expressions on each method invocation what is not so efficient at runtime * Introduce `default` `Expression`-based method to the `PublisherMetadataSource` contract and call existing String-based methods for backward compatibility. * Deprecate String-based `PublisherMetadataSource` methods in favor of newly introduced `Expression`-based * Implement new `getExpressionForPayload()` and `getExpressionsForHeaders()` in all the `PublisherMetadataSource` implementations * Cache parsed `Expression` s during initialization in the `PublisherMetadataSource` implementations or do that on demand in the `MethodAnnotationPublisherMetadataSource` by provided method basis * Introduce `MethodAnnotationPublisherMetadataSource#metadataCacheLimit` and populate its value from the `@EnablePublisher` or `<int:annotation-configuration>` * Implement `entrySet()` and `values()` in the `ExpressionEvalMap` **Cherry-pick to 5.0.x** * Add `@SuppressWarnings("varargs")` to avoid compilation warning * Remove LRU cache logic - it's fine to cache all the info about methods in the classpath
Spring Integration 
Checking out and Building
To check out the project and build from source, do the following:
git clone git://github.com/spring-projects/spring-integration.git
cd spring-integration
./gradlew build
NOTE: While Spring Integration runs with Java SE 6 or higher, a Java 8 compiler is required to build the project.
If you encounter out of memory errors during the build, increase available heap and permgen for Gradle:
GRADLE_OPTS='-XX:MaxPermSize=1024m -Xmx1024m'
To build and install jars into your local Maven cache:
./gradlew install
To build api Javadoc (results will be in build/api):
./gradlew api
To build reference documentation (results will be in build/reference):
./gradlew reference
To build complete distribution including -dist, -docs, and -schema zip files (results will be in build/distributions)
./gradlew dist
Using Eclipse
To generate Eclipse metadata (.classpath and .project files), do the following:
./gradlew eclipse
Once complete, you may then import the projects into Eclipse as usual:
File -> Import -> Existing projects into workspace
Browse to the 'spring-integration' root directory. All projects should import free of errors.
Using IntelliJ IDEA
To generate IDEA metadata (.iml and .ipr files), do the following:
./gradlew idea
Resources
For more information, please visit the Spring Integration website at: http://projects.spring.io/spring-integration