INT-3950: Fix Aggregator documentation

JIRA: https://jira.spring.io/browse/INT-3950

Previously there was a mention of the `MessageGroupStore.expireMessageGroup(groupId)` which just doesn't existing
in the Framework and never has been there.

* Fix the documentation for the existing `MessageGroupStore.expireMessageGroups(timeout)`.
Although the mention there of `Control Bus` requires to have `@ManagedOperation` on the method.

* Add `@ManagedOperation` for the `MessageGroupStore.expireMessageGroups(timeout)` and confirm with the test-case: `AggregatorWithMessageStoreParserTests`
* Fix the same docs in the XSD for `<aggregator>`
* Fix other typos in the `aggregator.adoc` and `resequencer.adoc`

Conflicts:
	spring-integration-core/src/main/java/org/springframework/integration/store/AbstractMessageGroupStore.java

Conflicts:
	spring-integration-core/src/main/java/org/springframework/integration/store/AbstractMessageGroupStore.java
	src/reference/asciidoc/aggregator.adoc
	src/reference/asciidoc/resequencer.adoc

spring-integration-core/src/main/java/org/springframework/integration/store/AbstractMessageGroupStore.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2016 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
@@ -25,6 +25,7 @@ import org.springframework.integration.support.DefaultMessageBuilderFactory;
 import org.springframework.integration.support.MessageBuilderFactory;
 import org.springframework.integration.support.utils.IntegrationUtils;
 import org.springframework.jmx.export.annotation.ManagedAttribute;
+import org.springframework.jmx.export.annotation.ManagedOperation;
 import org.springframework.jmx.export.annotation.ManagedResource;
 import org.springframework.messaging.Message;
 
@@ -94,11 +95,12 @@ public abstract class AbstractMessageGroupStore implements MessageGroupStore, It
 
 	@Override
 	public void registerMessageGroupExpiryCallback(MessageGroupCallback callback) {
-		expiryCallbacks.add(callback);
+		this.expiryCallbacks.add(callback);
 	}
 
 	@Override
-	public int expireMessageGroups(long timeout) {
+	@ManagedOperation
+	public synchronized int expireMessageGroups(long timeout) {
 		int count = 0;
 		long threshold = System.currentTimeMillis() - timeout;
 		for (MessageGroup group : this) {

spring-integration-core/src/main/java/org/springframework/integration/store/MessageGroupStore.java

@@ -15,6 +15,7 @@ package org.springframework.integration.store;
 import java.util.Iterator;
 
 import org.springframework.jmx.export.annotation.ManagedAttribute;
+import org.springframework.jmx.export.annotation.ManagedOperation;
 import org.springframework.messaging.Message;
 
 /**
@@ -77,6 +78,7 @@ public interface MessageGroupStore extends BasicMessageGroupStore {
 	 *
 	 * @see #registerMessageGroupExpiryCallback(MessageGroupCallback)
 	 */
+	@ManagedOperation
 	int expireMessageGroups(long timeout);
 
 	/**
@@ -121,7 +123,7 @@ public interface MessageGroupStore extends BasicMessageGroupStore {
 	/**
 	 * Invoked when a MessageGroupStore expires a group.
 	 */
-	public interface MessageGroupCallback {
+	interface MessageGroupCallback {
 
 		void execute(MessageGroupStore messageGroupStore, MessageGroup group);
 

spring-integration-core/src/test/java/org/springframework/integration/config/AggregatorWithMessageStoreParserTests-context.xml

@@ -14,10 +14,12 @@
 
 	<aggregator id="aggregator" ref="aggregatorBean"
 		input-channel="input" output-channel="output" message-store="messageStore" send-partial-result-on-expiry="true"/>
-		
+
 	<beans:bean id="messageStore" class="org.springframework.integration.store.SimpleMessageStore"/>
 
 	<beans:bean id="aggregatorBean"
 		class="org.springframework.integration.config.TestAggregatorBean" />
 
+	<control-bus input-channel="controlBusChannel" output-channel="nullChannel"/>
+
 </beans:beans>

spring-integration-core/src/test/java/org/springframework/integration/config/AggregatorWithMessageStoreParserTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2010 the original author or authors.
+ * Copyright 2002-2016 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.
@@ -26,31 +26,36 @@ import org.springframework.messaging.Message;
 import org.springframework.messaging.MessageChannel;
 import org.springframework.integration.store.MessageGroupStore;
 import org.springframework.integration.support.MessageBuilder;
+import org.springframework.messaging.support.GenericMessage;
 import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 
 /**
  * @author Dave Syer
+ * @author Artem Bilan
  */
 @ContextConfiguration
 @RunWith(SpringJUnit4ClassRunner.class)
+@DirtiesContext
 public class AggregatorWithMessageStoreParserTests {
-	
+
 	@Autowired
 	@Qualifier("input")
 	private MessageChannel input;
-	
+
 	@Autowired
 	private TestAggregatorBean aggregatorBean;
-	
+
 	@Autowired
 	private MessageGroupStore messageGroupStore;
 
+    @Autowired
+	private MessageChannel controlBusChannel;
+
     @Test
     @DirtiesContext
     public void testAggregation() {
- 
         input.send(createMessage("123", "id1", 3, 1, null));
         assertEquals(1, messageGroupStore.getMessageGroup("id1").size());
         input.send(createMessage("789", "id1", 3, 3, null));
@@ -67,12 +72,11 @@ public class AggregatorWithMessageStoreParserTests {
     @Test
     @DirtiesContext
     public void testExpiry() {
- 
         input.send(createMessage("123", "id1", 3, 1, null));
         assertEquals(1, messageGroupStore.getMessageGroup("id1").size());
         input.send(createMessage("456", "id1", 3, 2, null));
         assertEquals(2, messageGroupStore.getMessageGroup("id1").size());
-        messageGroupStore.expireMessageGroups(-10000);
+	    this.controlBusChannel.send(new GenericMessage<Object>("@messageStore.expireMessageGroups(-10000)"));
         assertEquals("One and only one message should have been aggregated", 1, aggregatorBean
                 .getAggregatedMessages().size());
         Message<?> aggregatedMessage = aggregatorBean.getAggregatedMessages().get("id1");

spring-integration-mongodb/src/main/java/org/springframework/integration/mongodb/store/ConfigurableMongoDbMessageStore.java

@@ -38,6 +38,7 @@ import org.springframework.integration.store.MessageGroupStore;
 import org.springframework.integration.store.MessageStore;
 import org.springframework.integration.store.SimpleMessageGroup;
 import org.springframework.jmx.export.annotation.ManagedAttribute;
+import org.springframework.jmx.export.annotation.ManagedOperation;
 import org.springframework.messaging.Message;
 import org.springframework.util.Assert;
 
@@ -286,6 +287,7 @@ public class ConfigurableMongoDbMessageStore extends AbstractConfigurableMongoDb
 	}
 
 	@Override
+	@ManagedOperation
 	public int expireMessageGroups(long timeout) {
 		int count = 0;
 		long threshold = System.currentTimeMillis() - timeout;

src/reference/docbook/aggregator.xml

@@ -437,7 +437,7 @@ then you should simply provide an implementation of the <classname>ReleaseStrate
 		once their containing <classname>MessageGroup</classname> is expired (see <code>MessageGroupStore.expireMessageGroups(long)</code>).
 		One way of expiring <classname>MessageGroup</classname>s is by configuring a <classname>MessageGroupStoreReaper</classname>.
 		However <classname>MessageGroup</classname>s can alternatively be expired by simply calling
-		<code>MessageGroupStore.expireMessageGroup(groupId)</code>. That could be accomplished via a Control Bus operation
+		<code>MessageGroupStore.expireMessageGroups(timeout)</code>. That could be accomplished via a Control Bus operation
 		or by simply invoking that method if you have a reference to the <classname>MessageGroupStore</classname> instance.
 		Otherwise by itself this attribute has no behavior. It only serves as an indicator of what to do (discard or send to the output/reply
 		channel) with Messages that are still in the <classname>MessageGroup</classname> that is about to be expired.