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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.flow;
public class CreditCreditManager extends AbstractFlowCreditManager implements FlowCreditManager_0_10
{
private volatile long _bytesCredit;
private volatile long _messageCredit;
public CreditCreditManager(long bytesCredit, long messageCredit)
{
_bytesCredit = bytesCredit;
_messageCredit = messageCredit;
setSuspended(!hasCredit());
}
public synchronized void setCreditLimits(final long bytesCredit, final long messageCredit)
{
_bytesCredit = bytesCredit;
_messageCredit = messageCredit;
setSuspended(!hasCredit());
}
public long getMessageCredit()
{
return _messageCredit == -1L
? Long.MAX_VALUE
: _messageCredit;
}
public long getBytesCredit()
{
return _bytesCredit == -1L
? Long.MAX_VALUE
: _bytesCredit;
}
public synchronized void restoreCredit(final long messageCredit, final long bytesCredit)
{
}
public synchronized void addCredit(final long messageCredit, final long bytesCredit)
{
boolean notifyIncrease = true;
if(_messageCredit >= 0L && messageCredit > 0L)
{
notifyIncrease = _messageCredit != 0L;
_messageCredit += messageCredit;
}
if(_bytesCredit >= 0L && bytesCredit > 0L)
{
notifyIncrease = notifyIncrease && bytesCredit>0;
_bytesCredit += bytesCredit;
if(notifyIncrease)
{
notifyIncreaseBytesCredit();
}
}
setSuspended(!hasCredit());
}
public void clearCredit()
{
_bytesCredit = 0l;
_messageCredit = 0l;
setSuspended(true);
}
public synchronized boolean hasCredit()
{
// Note !=, if credit is < 0 that indicates infinite credit
return (_bytesCredit != 0L && _messageCredit != 0L);
}
public synchronized boolean useCreditForMessage(long msgSize)
{
if(_messageCredit >= 0L)
{
if(_messageCredit > 0)
{
if(_bytesCredit < 0L)
{
_messageCredit--;
return true;
}
else if(msgSize <= _bytesCredit)
{
_messageCredit--;
_bytesCredit -= msgSize;
return true;
}
else
{
return false;
}
}
else
{
setSuspended(true);
return false;
}
}
else if(_bytesCredit >= 0L)
{
if(msgSize <= _bytesCredit)
{
_bytesCredit -= msgSize;
return true;
}
else
{
return false;
}
}
else
{
return true;
}
}
public synchronized void stop()
{
if(_bytesCredit > 0)
{
_bytesCredit = 0;
}
if(_messageCredit > 0)
{
_messageCredit = 0;
}
}
}
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