content: /**
   * 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.activemq.store;
  
  import java.io.IOException;
  
  import org.apache.activemq.broker.ConnectionContext;
  import org.apache.activemq.command.ActiveMQDestination;
  import org.apache.activemq.command.Message;
  import org.apache.activemq.command.MessageAck;
  import org.apache.activemq.command.MessageId;
  import org.apache.activemq.usage.MemoryUsage;
  
  abstract public class AbstractMessageStore implements MessageStore {
      public static final ListenableFuture<Object> FUTURE;
      protected final ActiveMQDestination destination;
      protected boolean prioritizedMessages;
      protected IndexListener indexListener;
      protected final MessageStoreStatistics messageStoreStatistics = new MessageStoreStatistics();
  
      public AbstractMessageStore(ActiveMQDestination destination) {
          this.destination = destination;
      }
  
      @Override
      public void dispose(ConnectionContext context) {
      }
  
      @Override
      public void start() throws Exception {
          recoverMessageStoreStatistics();
      }
  
      @Override
      public void stop() throws Exception {
      }
  
      @Override
      public ActiveMQDestination getDestination() {
          return destination;
      }
  
      @Override
      public void setMemoryUsage(MemoryUsage memoryUsage) {
      }
  
      @Override
      public void setBatch(MessageId messageId) throws IOException, Exception {
      }
  
      /**
       * flag to indicate if the store is empty
       *
       * @return true if the message count is 0
       * @throws Exception
       */
      @Override
      public boolean isEmpty() throws Exception {
          return getMessageCount() == 0;
      }
  
      @Override
      public void setPrioritizedMessages(boolean prioritizedMessages) {
          this.prioritizedMessages = prioritizedMessages;
      }
  
      @Override
      public boolean isPrioritizedMessages() {
          return this.prioritizedMessages;
      }
  
      @Override
      public void addMessage(final ConnectionContext context, final Message message, final boolean canOptimizeHint) throws IOException{
          addMessage(context, message);
      }
  
      @Override
      public ListenableFuture<Object> asyncAddQueueMessage(final ConnectionContext context, final Message message) throws IOException {
          addMessage(context, message);
          return FUTURE;
      }
  
      @Override
      public ListenableFuture<Object> asyncAddQueueMessage(final ConnectionContext context, final Message message, final boolean canOptimizeHint) throws IOException {
          addMessage(context, message, canOptimizeHint);
          return FUTURE;
      }
  
      @Override
      public ListenableFuture<Object> asyncAddTopicMessage(final ConnectionContext context, final Message message, final boolean canOptimizeHint) throws IOException {
          addMessage(context, message, canOptimizeHint);
          return FUTURE;
      }
  
      @Override
      public ListenableFuture<Object> asyncAddTopicMessage(final ConnectionContext context, final Message message) throws IOException {
          addMessage(context, message);
          return new InlineListenableFuture();
      }
  
      @Override
      public void removeAsyncMessage(ConnectionContext context, MessageAck ack) throws IOException {
          removeMessage(context, ack);
      }
  
      @Override
      public void updateMessage(Message message) throws IOException {
          throw new IOException("update is not supported by: " + this);
      }
  
      @Override
      public void registerIndexListener(IndexListener indexListener) {
          this.indexListener = indexListener;
      }
  
      public IndexListener getIndexListener() {
          return indexListener;
      }
  
      static {
         FUTURE = new InlineListenableFuture();
      }
  
      @Override
      public int getMessageCount() throws IOException {
          return (int) getMessageStoreStatistics().getMessageCount().getCount();
      }
  
      @Override
      public long getMessageSize() throws IOException {
          return getMessageStoreStatistics().getMessageSize().getTotalSize();
      }
  
      @Override
      public MessageStoreStatistics getMessageStoreStatistics() {
          return messageStoreStatistics;
      }
  
      protected void recoverMessageStoreStatistics() throws IOException {
  
      }
  }
  