src/main/activemq/transport/failover/BackupTransportPool.h

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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.
 */

#ifndef _ACTIVEMQ_TRANSPORT_FAILOVER_BACKUPTRANSPORTPOOL_H_
#define _ACTIVEMQ_TRANSPORT_FAILOVER_BACKUPTRANSPORTPOOL_H_

#include <activemq/util/Config.h>
#include <activemq/threads/CompositeTask.h>
#include <activemq/threads/CompositeTaskRunner.h>
#include <activemq/transport/failover/CloseTransportsTask.h>
#include <activemq/transport/failover/BackupTransport.h>
#include <activemq/transport/failover/URIPool.h>

#include <decaf/lang/Pointer.h>
#include <decaf/io/IOException.h>
#include <decaf/util/LinkedList.h>

namespace activemq {
namespace transport {
namespace failover {

    using decaf::lang::Pointer;
    using decaf::util::LinkedList;
    using activemq::threads::CompositeTaskRunner;

    class AMQCPP_API BackupTransportPool : public activemq::threads::CompositeTask {
    private:

        friend class BackupTransport;

        mutable LinkedList< Pointer<BackupTransport> > backups;
        Pointer<CompositeTaskRunner> taskRunner;
        Pointer<CloseTransportsTask> closeTask;
        Pointer<URIPool> uriPool;
        volatile int backupPoolSize;
        volatile bool enabled;
        volatile bool pending;

    public:

        BackupTransportPool( const Pointer<CompositeTaskRunner>& taskRunner,
                             const Pointer<CloseTransportsTask>& closeTask,
                             const Pointer<URIPool>& uriPool );

        BackupTransportPool( int backupPoolSize,
                             const Pointer<CompositeTaskRunner>& taskRunner,
                             const Pointer<CloseTransportsTask>& closeTask,
                             const Pointer<URIPool>& uriPool );

        virtual ~BackupTransportPool();

        virtual bool isPending() const;

        Pointer<BackupTransport> getBackup();

        virtual bool iterate();

        int getBackupPoolSize() const {
            return this->backupPoolSize;
        }

        void setBackupPoolSize( int size ) {
            this->backupPoolSize = size;
        }

        bool isEnabled() const {
            return this->enabled;
        }

        void setEnabled( bool value );

    private:

        // The backups report their failure to the pool, the pool removes them
        // from the list and returns their URIs to the URIPool, and then adds
        // the internal transport to the close transport's task for cleanup.
        void onBackupTransportFailure( BackupTransport* failedTransport );

        Pointer<Transport> createTransport( const URI& location ) const;

    };

}}}

#endif /*_ACTIVEMQ_TRANSPORT_FAILOVER_BACKUPTRANSPORTPOOL_H_*/