org.springframework.integration.store.SimpleMessageGroup Maven / Gradle / Ivy
/*
* Copyright 2002-2019 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
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.integration.store;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Set;
import org.springframework.integration.IntegrationMessageHeaderAccessor;
import org.springframework.messaging.Message;
import org.springframework.util.Assert;
/**
* Represents a mutable group of correlated messages that is bound to a certain {@link MessageStore} and group id.
* The group will grow during its lifetime, when messages are add
ed to it.
* This MessageGroup is thread safe.
*
* @author Iwein Fuld
* @author Oleg Zhurakousky
* @author Dave Syer
* @author Gary Russell
* @author Artem Bilan
*
* @since 2.0
*/
public class SimpleMessageGroup implements MessageGroup {
private final Object groupId;
private final Collection> messages;
private final Set sequences = new HashSet<>();
private final long timestamp;
private volatile int lastReleasedMessageSequence;
private volatile long lastModified;
private volatile boolean complete;
public SimpleMessageGroup(Object groupId) {
this(Collections.>emptyList(), groupId);
}
public SimpleMessageGroup(Collection> messages, Object groupId) {
this(messages, groupId, System.currentTimeMillis(), false);
}
public SimpleMessageGroup(MessageGroup messageGroup) {
this(messageGroup.getMessages(), messageGroup.getGroupId(), messageGroup.getTimestamp(),
messageGroup.isComplete());
}
public SimpleMessageGroup(Collection> messages, Object groupId, long timestamp,
boolean complete) {
this(new LinkedHashSet<>(), messages, groupId, timestamp, complete, false);
}
public SimpleMessageGroup(Collection> internalStore, Collection> messages,
Object groupId, long timestamp, boolean complete, boolean storePreLoaded) {
Assert.notNull(internalStore, "'internalStore' must not be null");
this.messages = internalStore;
this.groupId = groupId;
this.timestamp = timestamp;
this.complete = complete;
if (!storePreLoaded) {
Assert.notNull(messages, "'messages' must not be null");
for (Message message : messages) {
if (message != null) { //see INT-2666
addMessage(message);
}
}
}
}
@Override
public long getTimestamp() {
return this.timestamp;
}
@Override
public void setLastModified(long lastModified) {
this.lastModified = lastModified;
}
@Override
public long getLastModified() {
return this.lastModified;
}
@Override
public boolean canAdd(Message message) {
return true;
}
@Override
public void add(Message messageToAdd) {
addMessage(messageToAdd);
}
@Override
public boolean remove(Message message) {
this.sequences.remove(message.getHeaders().get(IntegrationMessageHeaderAccessor.SEQUENCE_NUMBER));
return this.messages.remove(message);
}
@Override
public int getLastReleasedMessageSequenceNumber() {
return this.lastReleasedMessageSequence;
}
private boolean addMessage(Message message) {
Integer sequence = message.getHeaders().get(IntegrationMessageHeaderAccessor.SEQUENCE_NUMBER, Integer.class);
this.sequences.add(sequence != null ? sequence : 0);
return this.messages.add(message);
}
@Override
public Collection> getMessages() {
return Collections.unmodifiableCollection(this.messages);
}
@Override
public void setLastReleasedMessageSequenceNumber(int sequenceNumber) {
this.lastReleasedMessageSequence = sequenceNumber;
}
@Override
public Object getGroupId() {
return this.groupId;
}
@Override
public boolean isComplete() {
return this.complete;
}
@Override
public void complete() {
this.complete = true;
}
@Override
public int getSequenceSize() {
if (size() == 0) {
return 0;
}
return new IntegrationMessageHeaderAccessor(getOne()).getSequenceSize();
}
@Override
public int size() {
return this.messages.size();
}
@Override
public Message getOne() {
synchronized (this.messages) {
Iterator> iterator = this.messages.iterator();
return iterator.hasNext() ? iterator.next() : null;
}
}
@Override
public void clear() {
this.messages.clear();
this.sequences.clear();
}
/**
* Return true if a message with this sequence number header exists in
* the group.
* @param sequence the sequence number.
* @return true if it exists.
* @since 4.3.7
*/
public boolean containsSequence(Integer sequence) {
return this.sequences.contains(sequence);
}
@Override
public String toString() {
return "SimpleMessageGroup{" +
"groupId=" + this.groupId +
", messages=" + this.messages +
", timestamp=" + this.timestamp +
", lastModified=" + this.lastModified +
'}';
}
}