broker-plugins/amqp-0-8-protocol/src/main/java/org/apache/qpid/server/protocol/v0_8/NoAckCreditManager.java

/*
 * 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.protocol.v0_8;

import org.apache.qpid.server.transport.ProtocolEngine;
import org.apache.qpid.server.flow.AbstractFlowCreditManager;

public class NoAckCreditManager extends AbstractFlowCreditManager
{
    private final ProtocolEngine _protocolEngine;

    public NoAckCreditManager(ProtocolEngine protocolEngine)
    {
        _protocolEngine = protocolEngine;
    }

    @Override
    public void restoreCredit(final long messageCredit, final long bytesCredit)
    {
        setSuspended(!hasCredit());
    }

    @Override
    public boolean hasCredit()
    {
        return !_protocolEngine.isTransportBlockedForWriting();
    }

    @Override
    public boolean useCreditForMessage(final long msgSize)
    {
        if (!hasCredit())
        {
            setSuspended(true);
            return false;
        }
        return true;
    }
}