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`

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

@@ -26,6 +26,7 @@ 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;
 
@@ -107,6 +108,7 @@ public abstract class AbstractMessageGroupStore extends AbstractBatchingMessageG
 	}
 
 	@Override
+	@ManagedOperation
 	public synchronized int expireMessageGroups(long timeout) {
 		int count = 0;
 		long threshold = System.currentTimeMillis() - timeout;

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

@@ -17,6 +17,7 @@ import java.util.Collection;
 import java.util.Iterator;
 
 import org.springframework.jmx.export.annotation.ManagedAttribute;
+import org.springframework.jmx.export.annotation.ManagedOperation;
 import org.springframework.messaging.Message;
 
 /**
@@ -101,6 +102,7 @@ public interface MessageGroupStore extends BasicMessageGroupStore {
 	 *
 	 * @see #registerMessageGroupExpiryCallback(MessageGroupCallback)
 	 */
+	@ManagedOperation
 	int expireMessageGroups(long timeout);
 
 	/**
@@ -145,7 +147,7 @@ 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/main/resources/org/springframework/integration/config/spring-integration-4.3.xsd

@@ -3739,7 +3739,7 @@
 						Specifies whether messages that expired should be aggregated and sent to the 'output-channel' or 'replyChannel'.
 						Messages are expired when their containing MessageGroup expires. One of the ways of expiring MessageGroups is by
 						configuring a MessageGroupStoreReaper. However MessageGroups can alternatively be expired by simply calling
-						MessageGroupStore.expireMessageGroup(groupId). That could be accomplished via a ControlBus operation
+						MessageGroupStore.expireMessageGroups(timeout). That could be accomplished via a ControlBus operation
 						or by simply invoking that method if you have a reference to the MessageGroupStore instance.
 						</xsd:documentation>
 					</xsd:annotation>

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");