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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.qpid.server.store;
import org.apache.commons.configuration.Configuration;
import org.apache.qpid.AMQStoreException;
import org.apache.qpid.server.message.EnqueableMessage;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
/** A simple message store that stores the messages in a thread-safe structure in memory. */
public class MemoryMessageStore extends NullMessageStore
{
private final AtomicLong _messageId = new AtomicLong(1);
private final AtomicBoolean _closed = new AtomicBoolean(false);
private static final Transaction IN_MEMORY_TRANSACTION = new Transaction()
{
@Override
public StoreFuture commitTranAsync() throws AMQStoreException
{
return StoreFuture.IMMEDIATE_FUTURE;
}
@Override
public void enqueueMessage(TransactionLogResource queue, EnqueableMessage message) throws AMQStoreException
{
}
@Override
public void dequeueMessage(TransactionLogResource queue, EnqueableMessage message) throws AMQStoreException
{
}
@Override
public void commitTran() throws AMQStoreException
{
}
@Override
public void abortTran() throws AMQStoreException
{
}
@Override
public void removeXid(long format, byte[] globalId, byte[] branchId)
{
}
@Override
public void recordXid(long format, byte[] globalId, byte[] branchId, Record[] enqueues, Record[] dequeues)
{
}
};
private final StateManager _stateManager;
private final EventManager _eventManager = new EventManager();
public MemoryMessageStore()
{
_stateManager = new StateManager(_eventManager);
}
@Override
public void configureConfigStore(String name, ConfigurationRecoveryHandler recoveryHandler, Configuration config) throws Exception
{
_stateManager.attainState(State.INITIALISING);
}
@Override
public void configureMessageStore(String name, MessageStoreRecoveryHandler recoveryHandler, TransactionLogRecoveryHandler tlogRecoveryHandler, Configuration config) throws Exception
{
_stateManager.attainState(State.INITIALISED);
}
@Override
public void activate() throws Exception
{
_stateManager.attainState(State.ACTIVATING);
_stateManager.attainState(State.ACTIVE);
}
@Override
public StoredMessage addMessage(StorableMessageMetaData metaData)
{
final long id = _messageId.getAndIncrement();
StoredMemoryMessage message = new StoredMemoryMessage(id, metaData);
return message;
}
@Override
public Transaction newTransaction()
{
return IN_MEMORY_TRANSACTION;
}
@Override
public boolean isPersistent()
{
return false;
}
@Override
public void close() throws Exception
{
_stateManager.attainState(State.CLOSING);
_closed.getAndSet(true);
_stateManager.attainState(State.CLOSED);
}
@Override
public void addEventListener(EventListener eventListener, Event... events)
{
_eventManager.addEventListener(eventListener, events);
}
@Override
public String getStoreType()
{
return "Memory";
}
}
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