INT-3606: Implement Closeable/Flushable

JIRA: https://jira.spring.io/browse/INT-3606

Close the store when an (S)FTP synchronizing MessageSource is stopped.

Will need another commit on 4.2.WIP to change to `Lifecycle`.

Add dirty Flag to Properties MetadataStore

Avoid unnecessary persists.

Remove unnecessary implementation of `AbstractInboundFileSynchronizingMessageSource#getComponentType()`

spring-integration-file/src/main/java/org/springframework/integration/file/filters/AbstractPersistentAcceptOnceFileListFilter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2014 the original author or authors.
+ * Copyright 2013-2015 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.
@@ -16,6 +16,8 @@
 
 package org.springframework.integration.file.filters;
 
+import java.io.Closeable;
+import java.io.IOException;
 import java.util.List;
 
 import org.springframework.integration.metadata.ConcurrentMetadataStore;
@@ -32,7 +34,7 @@ import org.springframework.util.Assert;
  *
  */
 public abstract class AbstractPersistentAcceptOnceFileListFilter<F> extends AbstractFileListFilter<F>
-		implements ReversibleFileListFilter<F> {
+		implements ReversibleFileListFilter<F>, Closeable {
 
 	protected final ConcurrentMetadataStore store;
 
@@ -78,6 +80,13 @@ public abstract class AbstractPersistentAcceptOnceFileListFilter<F> extends Abst
 		}
 	}
 
+	@Override
+	public void close() throws IOException {
+		if (this.store instanceof Closeable) {
+			((Closeable) this.store).close();
+		}
+	}
+
 	/**
 	 * The default value stored for the key is the last modified date.
 	 * @param file The file.

spring-integration-file/src/main/java/org/springframework/integration/file/filters/CompositeFileListFilter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2015 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.
@@ -16,6 +16,8 @@
 
 package org.springframework.integration.file.filters;
 
+import java.io.Closeable;
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -37,7 +39,7 @@ import org.springframework.util.Assert;
  *
  * @param <F> The type that will be filtered.
  */
-public class CompositeFileListFilter<F> implements FileListFilter<F> {
+public class CompositeFileListFilter<F> implements FileListFilter<F>, Closeable {
 
 	private final Set<FileListFilter<F>> fileFilters;
 
@@ -51,6 +53,15 @@ public class CompositeFileListFilter<F> implements FileListFilter<F> {
 	}
 
 
+	@Override
+	public void close() throws IOException {
+		for (FileListFilter<F> filter : this.fileFilters) {
+			if (filter instanceof Closeable) {
+				((Closeable) filter).close();
+			}
+		}
+	}
+
 	public CompositeFileListFilter<F> addFilter(FileListFilter<F> filter) {
 		return this.addFilters(Collections.singletonList(filter));
 	}

spring-integration-file/src/main/java/org/springframework/integration/file/remote/synchronizer/AbstractInboundFileSynchronizer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2015 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.
@@ -17,6 +17,7 @@
 package org.springframework.integration.file.remote.synchronizer;
 
 import java.io.BufferedOutputStream;
+import java.io.Closeable;
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
@@ -57,7 +58,7 @@ import org.springframework.util.ObjectUtils;
  * @since 2.0
  */
 public abstract class AbstractInboundFileSynchronizer<F> implements InboundFileSynchronizer,
-		InitializingBean, IntegrationEvaluationContextAware {
+		InitializingBean, IntegrationEvaluationContextAware, Closeable {
 
 	protected final Log logger = LogFactory.getLog(this.getClass());
 
@@ -161,6 +162,13 @@ public abstract class AbstractInboundFileSynchronizer<F> implements InboundFileS
 		return temporaryFileSuffix;
 	}
 
+	@Override
+	public void close() throws IOException {
+		if (this.filter instanceof Closeable) {
+			((Closeable) this.filter).close();
+		}
+	}
+
 	@Override
 	public void synchronizeToLocalDirectory(final File localDirectory) {
 		try {

spring-integration-file/src/main/java/org/springframework/integration/file/remote/synchronizer/AbstractInboundFileSynchronizingMessageSource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2015 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.
@@ -16,12 +16,15 @@
 
 package org.springframework.integration.file.remote.synchronizer;
 
+import java.io.Closeable;
 import java.io.File;
 import java.io.FileNotFoundException;
+import java.io.IOException;
 import java.util.Arrays;
 import java.util.Comparator;
 import java.util.regex.Pattern;
 
+import org.springframework.integration.core.LifecycleMessageSource;
 import org.springframework.integration.endpoint.AbstractMessageSource;
 import org.springframework.integration.file.FileReadingMessageSource;
 import org.springframework.integration.file.filters.AcceptOnceFileListFilter;
@@ -54,7 +57,10 @@ import org.springframework.util.Assert;
  * @author Oleg Zhurakousky
  * @author Gary Russell
  */
-public abstract class AbstractInboundFileSynchronizingMessageSource<F> extends AbstractMessageSource<File> {
+public abstract class AbstractInboundFileSynchronizingMessageSource<F> extends AbstractMessageSource<File>
+		implements LifecycleMessageSource<File> {
+
+	private volatile boolean running;
 
 	/**
 	 * Should the endpoint attempt to create the local directory? True by default.
@@ -153,6 +159,29 @@ public abstract class AbstractInboundFileSynchronizingMessageSource<F> extends A
 		}
 	}
 
+	@Override
+	public void start() {
+		this.running = true;
+	}
+
+	@Override
+	public void stop() {
+		this.running = false;
+		if (this.synchronizer instanceof Closeable) {
+			try {
+				((Closeable) this.synchronizer).close();
+			}
+			catch (IOException e) {
+				logger.error("Error closing synchronizer", e);
+			}
+		}
+	}
+
+	@Override
+	public boolean isRunning() {
+		return this.running;
+	}
+
 	/**
 	 * Polls from the file source. If the result is not null, it will be returned.
 	 * If the result is null, it attempts to sync up with the remote directory to populate the file source.