e6140a66fd
JIRA: https://jira.spring.io/browse/INT-4560
Reproduced and tested with
```java
@SpringBootApplication
public class So53521593Application {
private static final Logger logger = LoggerFactory.getLogger(So53521593Application.class);
public static void main(String[] args) {
SpringApplication.run(So53521593Application.class, args);
}
@Bean
public IntegrationFlow flow() {
ExecutorService exec = Executors.newFixedThreadPool(10);
return IntegrationFlows.from(Files.inboundAdapter(new File("/tmp/foo")).filter(
new MyFilter(new SimpleMetadataStore(), "foo")),
e -> e.poller(Pollers.fixedDelay(5, TimeUnit.SECONDS)
.maxMessagesPerPoll(10)))
.channel(MessageChannels.executor(exec))
.<File>handle((p, h) -> {
try {
p.delete();
logger.info(p.toString());
Thread.sleep(10_000);
}
catch (InterruptedException e1) {
Thread.currentThread().interrupt();
}
return null;
})
.get();
}
}
class MyFilter extends FileSystemPersistentAcceptOnceFileListFilter {
public MyFilter(ConcurrentMetadataStore store, String prefix) {
super(store, prefix);
}
@Override
protected long modified(File file) {
long modified = super.modified(file);
System.out.println(modified);
return modified;
}
}
```
**cherry-pick to 5.0.x, 4.3.x**
(cherry picked from commit 39fef2c70a)
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