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package org.apache.qpid.server.flow;
import org.apache.qpid.server.queue.QueueEntry;
import java.util.concurrent.atomic.AtomicLong;
/*
*
* 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.
*
*/
public class BytesOnlyCreditManager extends AbstractFlowCreditManager
{
private final AtomicLong _bytesCredit;
public BytesOnlyCreditManager(long initialCredit)
{
_bytesCredit = new AtomicLong(initialCredit);
}
public void addCredit(long messageCredit, long bytesCredit)
{
_bytesCredit.addAndGet(bytesCredit);
setSuspended(false);
}
public void removeAllCredit()
{
_bytesCredit.set(0L);
}
public boolean hasCredit()
{
return _bytesCredit.get() > 0L;
}
public boolean useCreditForMessage(QueueEntry queueEntry)
{
final long msgSize = queueEntry.getSize();
if(hasCredit())
{
if(_bytesCredit.addAndGet(-msgSize) >= 0)
{
return true;
}
else
{
_bytesCredit.addAndGet(msgSize);
setSuspended(true);
return false;
}
}
else
{
return false;
}
}
}
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