org.apache.activemq.artemis.spi.core.protocol.MessagePersister Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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
*
* http://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.apache.activemq.artemis.spi.core.protocol;
import java.util.ServiceLoader;
import org.apache.activemq.artemis.api.core.ActiveMQBuffer;
import org.apache.activemq.artemis.api.core.Message;
import org.apache.activemq.artemis.core.persistence.CoreMessageObjectPools;
import org.apache.activemq.artemis.core.message.impl.CoreMessagePersister;
import org.apache.activemq.artemis.core.persistence.Persister;
import org.apache.activemq.artemis.core.persistence.StorageManager;
import org.apache.activemq.artemis.core.server.LargeServerMessage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.invoke.MethodHandles;
import static org.apache.activemq.artemis.core.persistence.PersisterIDs.MAX_PERSISTERS;
public class MessagePersister implements Persister {
@Override
public byte getID() {
return 0;
}
private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
private static final MessagePersister theInstance = new MessagePersister();
/** This will be used for reading messages */
private static final Persister[] persisters = new Persister[MAX_PERSISTERS];
static {
CoreMessagePersister persister = CoreMessagePersister.getInstance();
MessagePersister.registerPersister(persister);
Iterable protocols = ServiceLoader.load(ProtocolManagerFactory.class, MessagePersister.class.getClassLoader());
for (ProtocolManagerFactory next : protocols) {
registerProtocol(next);
}
}
public static void registerProtocol(ProtocolManagerFactory manager) {
Persister[] messagePersisters = manager.getPersister();
if (messagePersisters == null || messagePersisters.length == 0) {
logger.debug("Cannot find persister for {}", manager);
} else {
for (Persister p : messagePersisters) {
registerPersister(p);
}
}
}
public static void clearPersisters() {
for (int i = 0; i < persisters.length; i++) {
persisters[i] = null;
}
}
public static Persister getPersister(byte id) {
if (id == 0 || id > MAX_PERSISTERS) {
return null;
}
return persisters[id - 1];
}
public static void registerPersister(Persister persister) {
if (persister != null) {
assert persister.getID() <= MAX_PERSISTERS : "You must update MessagePersister::MAX_PERSISTERS to a higher number";
persisters[persister.getID() - 1] = persister;
}
}
public static MessagePersister getInstance() {
return theInstance;
}
protected MessagePersister() {
}
@Override
public int getEncodeSize(Message record) {
return 0;
}
/** Sub classes must add the first short as the protocol-id */
@Override
public void encode(ActiveMQBuffer buffer, Message record) {
buffer.writeByte(getID());
}
@Override
public Message decode(ActiveMQBuffer buffer, Message record, CoreMessageObjectPools pools) {
return decode(buffer, record, pools, null);
}
public Message decode(ActiveMQBuffer buffer, Message record, CoreMessageObjectPools pools, StorageManager storageManager) {
byte protocol = buffer.readByte();
Persister persister = getPersister(protocol);
if (persister == null) {
throw new NullPointerException("couldn't find factory for type=" + protocol);
}
Message message = persister.decode(buffer, record, pools);
if (message instanceof LargeServerMessage) {
((LargeServerMessage) message).setStorageManager(storageManager);
}
return message;
}
}