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.metadata.bootstrap;
  
  import java.rmi.RemoteException;
  import java.rmi.server.UnicastRemoteObject;
  import java.util.concurrent.TimeUnit;
  
  import org.apache.asterix.metadata.RMIClientFactory;
  import org.apache.asterix.metadata.RMIServerFactory;
  import org.apache.asterix.metadata.api.IAsterixStateProxy;
  import org.apache.asterix.metadata.api.IMetadataNode;
  import org.apache.hyracks.api.network.INetworkSecurityManager;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  
  /**
   * Contains Asterix distributed state such as the AsterixProperties.
   */
  public class AsterixStateProxy implements IAsterixStateProxy {
      private static final long serialVersionUID = 1L;
      private static final Logger LOGGER = LogManager.getLogger();
  
      private IMetadataNode metadataNode;
      private static IAsterixStateProxy cc;
  
      public static IAsterixStateProxy registerRemoteObject(INetworkSecurityManager networkSecurityManager,
              int metadataCallbackPort) throws RemoteException {
          cc = new AsterixStateProxy();
          IAsterixStateProxy stub = (IAsterixStateProxy) UnicastRemoteObject.exportObject(cc, metadataCallbackPort,
                  RMIClientFactory.getSocketFactory(networkSecurityManager),
                  RMIServerFactory.getSocketFactory(networkSecurityManager));
          LOGGER.info("Asterix Distributed State Proxy Bound");
          return stub;
      }
  
      public static void unregisterRemoteObject() throws RemoteException {
          if (cc != null) {
              UnicastRemoteObject.unexportObject(cc, true);
              LOGGER.info("Asterix Distributed State Proxy Unbound");
          }
      }
  
      @Override
      public synchronized void setMetadataNode(IMetadataNode metadataNode) {
          this.metadataNode = metadataNode;
          notifyAll();
      }
  
      @Override
      public IMetadataNode waitForMetadataNode(long waitFor, TimeUnit timeUnit) throws InterruptedException {
          synchronized (this) {
              //TODO(mblow): replace with nanoTime() to avoid being affected by system clock adjustments...
              long timeToWait = TimeUnit.MILLISECONDS.convert(waitFor, timeUnit);
              while (metadataNode == null && timeToWait > 0) {
                  long startTime = System.currentTimeMillis();
                  wait(timeToWait);
                  timeToWait -= System.currentTimeMillis() - startTime;
              }
              return metadataNode;
          }
      }
  }
  