broker/src/org/apache/qpid/server/store/MessageStore.java


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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.store;

import org.apache.commons.configuration.Configuration;
import org.apache.qpid.AMQException;
import org.apache.qpid.server.queue.AMQMessage;
import org.apache.qpid.server.queue.AMQQueue;
import org.apache.qpid.server.queue.QueueRegistry;

import java.util.List;

public interface MessageStore
{
    /**
     * Called after instantiation in order to configure the message store. A particular implementation can define
     * whatever parameters it wants.
     * @param queueRegistry the registry of queues to be used by this store
     * @param base the base element identifier from which all configuration items are relative. For example, if the base
     * element is "store", the all elements used by concrete classes will be "store.foo" etc.
     * @param config the apache commons configuration object
     */
    void configure(QueueRegistry queueRegistry, String base, Configuration config) throws Exception;

    /**
     * Called to close and cleanup any resources used by the message store.
     * @throws Exception
     */
    void close() throws Exception;

    void put(AMQMessage msg) throws AMQException;

    void removeMessage(long messageId) throws AMQException;

    void createQueue(AMQQueue queue) throws AMQException;

    void removeQueue(String name) throws AMQException;

    void enqueueMessage(String name, long messageId) throws AMQException;

    void dequeueMessage(String name, long messageId) throws AMQException;

    void beginTran() throws AMQException;

    void commitTran() throws AMQException;

    void abortTran() throws AMQException;

    boolean inTran();

    /**
     * Recreate all queues that were persisted, including re-enqueuing of existing messages
     * @return
     * @throws AMQException
     */
    List<AMQQueue> createQueues() throws AMQException;

    /**
     * Return a valid, currently unused message id.
     * @return a message id
     */
    long getNewMessageId();
}