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.asterix.runtime.message;
  
  import java.util.concurrent.BlockingQueue;
  import java.util.concurrent.LinkedBlockingQueue;
  
  import org.apache.asterix.common.api.INcApplicationContext;
  import org.apache.asterix.common.dataflow.ICcApplicationContext;
  import org.apache.asterix.common.messaging.api.ICCMessageBroker;
  import org.apache.asterix.common.messaging.api.ICcAddressedMessage;
  import org.apache.asterix.common.messaging.api.INCMessageBroker;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.logging.log4j.Level;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  
  public class TxnIdBlockRequest implements ICcAddressedMessage {
      private static final Logger LOGGER = LogManager.getLogger();
      private static final int BLOCK_SIZE = 512;
      private static final long serialVersionUID = 1L;
  
      private static BlockingQueue<TxnIdBlockResponse> blockQueue = new LinkedBlockingQueue<>();
      private final String nodeId;
      private final int blockSizeRequested;
  
      public TxnIdBlockRequest(String nodeId, int blockSizeRequested) {
          this.nodeId = nodeId;
          this.blockSizeRequested = blockSizeRequested;
      }
  
      @Override
      public void handle(ICcApplicationContext appCtx) throws HyracksDataException {
          try {
              ICCMessageBroker broker = (ICCMessageBroker) appCtx.getServiceContext().getMessageBroker();
              long startingId = appCtx.getTxnIdFactory().getIdBlock(blockSizeRequested);
              TxnIdBlockResponse response = new TxnIdBlockResponse(startingId, blockSizeRequested);
              broker.sendRealTimeApplicationMessageToNC(response, nodeId);
          } catch (Exception e) {
              throw HyracksDataException.create(e);
          }
      }
  
      public static Block send(INcApplicationContext ncs) throws HyracksDataException {
          TxnIdBlockRequest blockRequestMessage = new TxnIdBlockRequest(ncs.getServiceContext().getNodeId(), BLOCK_SIZE);
          try {
              ((INCMessageBroker) ncs.getServiceContext().getMessageBroker()).sendMessageToPrimaryCC(blockRequestMessage);
              TxnIdBlockResponse response = blockQueue.take();
              return new Block(response.getStartingId(), response.getBlockSize());
          } catch (Exception e) {
              LOGGER.log(Level.ERROR, "Unable to request transaction id block", e);
              throw HyracksDataException.create(e);
          }
      }
  
      static void addResponse(TxnIdBlockResponse response) {
          blockQueue.offer(response);
      }
  
      @Override
      public boolean isWhispered() {
          return true;
      }
  
      @Override
      public String toString() {
          return TxnIdBlockRequest.class.getSimpleName();
      }
  
      public static class Block {
  
          private final long startingId;
          private final int blockSize;
  
          public Block(long startingId, int blockSize) {
              this.startingId = startingId;
              this.blockSize = blockSize;
          }
  
          public long getStartingId() {
              return startingId;
          }
  
          public int getBlockSize() {
              return blockSize;
          }
      }
  }
  