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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.client.state;
import org.apache.qpid.AMQException;
import org.apache.qpid.client.protocol.AMQProtocolSession;
import org.apache.qpid.framing.*;
import org.apache.qpid.protocol.AMQMethodEvent;
import org.apache.qpid.protocol.AMQMethodListener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Iterator;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;
/**
* The state manager is responsible for managing the state of the protocol session. <p/> For each AMQProtocolHandler
* there is a separate state manager.
*/
public class AMQStateManager
{
private static final Logger _logger = LoggerFactory.getLogger(AMQStateManager.class);
private AMQProtocolSession _protocolSession;
/** The current state */
private AMQState _currentState;
/**
* Maps from an AMQState instance to a Map from Class to StateTransitionHandler. The class must be a subclass of
* AMQFrame.
*/
private final Object _stateLock = new Object();
private static final long MAXIMUM_STATE_WAIT_TIME = Long.parseLong(System.getProperty("amqj.MaximumStateWait", "30000"));
public AMQStateManager()
{
this(null);
}
public AMQStateManager(AMQProtocolSession protocolSession)
{
this(AMQState.CONNECTION_NOT_STARTED, true, protocolSession);
}
protected AMQStateManager(AMQState state, boolean register, AMQProtocolSession protocolSession)
{
_protocolSession = protocolSession;
_currentState = state;
}
public AMQState getCurrentState()
{
return _currentState;
}
public void changeState(AMQState newState) throws AMQException
{
_logger.debug("State changing to " + newState + " from old state " + _currentState);
synchronized (_stateLock)
{
_currentState = newState;
_stateLock.notifyAll();
}
}
public <B extends AMQMethodBody> boolean methodReceived(AMQMethodEvent<B> evt) throws AMQException
{
B method = evt.getMethod();
// StateAwareMethodListener handler = findStateTransitionHandler(_currentState, evt.getMethod());
method.execute(_protocolSession.getMethodDispatcher(), evt.getChannelId());
return true;
}
public void attainState(final AMQState s) throws AMQException
{
synchronized (_stateLock)
{
final long waitUntilTime = System.currentTimeMillis() + MAXIMUM_STATE_WAIT_TIME;
long waitTime = MAXIMUM_STATE_WAIT_TIME;
while ((_currentState != s) && (waitTime > 0))
{
try
{
_stateLock.wait(MAXIMUM_STATE_WAIT_TIME);
}
catch (InterruptedException e)
{
_logger.warn("Thread interrupted");
}
if (_currentState != s)
{
waitTime = waitUntilTime - System.currentTimeMillis();
}
}
if (_currentState != s)
{
_logger.warn("State not achieved within permitted time. Current state " + _currentState
+ ", desired state: " + s);
throw new AMQException("State not achieved within permitted time. Current state " + _currentState
+ ", desired state: " + s);
}
}
// at this point the state will have changed.
}
public AMQProtocolSession getProtocolSession()
{
return _protocolSession;
}
public void setProtocolSession(AMQProtocolSession session)
{
_protocolSession = session;
}
public MethodRegistry getMethodRegistry()
{
return getProtocolSession().getMethodRegistry();
}
public AMQState attainState(Set<AMQState> stateSet) throws AMQException
{
synchronized (_stateLock)
{
final long waitUntilTime = System.currentTimeMillis() + MAXIMUM_STATE_WAIT_TIME;
long waitTime = MAXIMUM_STATE_WAIT_TIME;
while (!stateSet.contains(_currentState) && (waitTime > 0))
{
try
{
_stateLock.wait(MAXIMUM_STATE_WAIT_TIME);
}
catch (InterruptedException e)
{
_logger.warn("Thread interrupted");
}
if (!stateSet.contains(_currentState))
{
waitTime = waitUntilTime - System.currentTimeMillis();
}
}
if (!stateSet.contains(_currentState))
{
_logger.warn("State not achieved within permitted time. Current state " + _currentState
+ ", desired state: " + stateSet);
throw new AMQException("State not achieved within permitted time. Current state " + _currentState
+ ", desired state: " + stateSet);
}
return _currentState;
}
}
}
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