Package org.nebulaframework.grid.cluster.manager.services.registration

Source Code of org.nebulaframework.grid.cluster.manager.services.registration.ClusterRegistrationServiceImpl

/*
* Copyright (C) 2008 Yohan Liyanage.
*
* Licensed 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.nebulaframework.grid.cluster.manager.services.registration;

import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

import javax.jms.ConnectionFactory;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.nebulaframework.deployment.classloading.node.exporter.GridNodeClassExporterSupport;
import org.nebulaframework.grid.cluster.manager.ClusterManager;
import org.nebulaframework.grid.cluster.node.GridNodeProfile;
import org.nebulaframework.grid.cluster.node.delegate.GridNodeDelegate;
import org.nebulaframework.grid.cluster.registration.Registration;
import org.nebulaframework.grid.cluster.registration.RegistrationImpl;
import org.nebulaframework.grid.service.event.ServiceEventsSupport;
import org.nebulaframework.grid.service.event.ServiceHookCallback;
import org.nebulaframework.grid.service.message.ServiceMessage;
import org.nebulaframework.grid.service.message.ServiceMessageType;
import org.springframework.beans.factory.annotation.Required;

/**
* Implementation of {@link ClusterRegistrationService}, which is responsible
* for handling {@code GridNode} registration with in the cluster.
* <p>
* This class will be remote enabled through Spring JMS Remoting support, so
* that it could be accessed by remote {@code GridNode}s.
* <p>
* This class holds references to the registered {@code GridNode}s, through a
* special delegate instance dedicated for each node, implemented by
* {@code GridNodeDelegate}.
* <p>
* <i>Spring Managed</i>
*
* @author Yohan Liyanage
* @version 1.0
*
* @see ClusterRegistrationService
* @see GridNodeDelegate
*/
public class ClusterRegistrationServiceImpl implements
    ClusterRegistrationService, InternalClusterRegistrationService {

  private static Log log = LogFactory
      .getLog(ClusterRegistrationServiceImpl.class);

  private ClusterManager cluster;          // Owner Cluster
  private ConnectionFactory connectionFactory;  // JMS Connection Factory

  // Holds delegate references of GridNodes registered, against Node Id
  private Map<UUID, GridNodeDelegate> clusterNodes = new HashMap<UUID, GridNodeDelegate>();

  /**
   * Constructs a {@code ClusterRegistrationServiceImpl} for
   * the given {@code ClusterManager}.
   *
   * @param cluster {@code ClusterManager}
   */
  public ClusterRegistrationServiceImpl(ClusterManager cluster) {
    super();
    this.cluster = cluster;
  }

  /**
   * Sets the JMS ConnectionFactory used by this class to communicate
   * with remote {@code GridNode}s.
   *
   * @param connectionFactory JMS {@code ConnectionFactory}
   */
  @Required
  public void setConnectionFactory(ConnectionFactory connectionFactory) {
    this.connectionFactory = connectionFactory;
  }

  /**
   * {@inheritDoc}
   */
  public Registration registerNode(final UUID nodeId, GridNodeProfile profile) {

    // Set the Registration Data
    RegistrationImpl reg = new RegistrationImpl();
    reg.setBrokerUrl(this.cluster.getClusterInfo().getServiceUrl());
    reg.setNodeId(nodeId);
    reg.setClusterId(this.cluster.getClusterId());

    GridNodeDelegate delegate = new GridNodeDelegate(nodeId, profile);
    delegate.setClassExporter(GridNodeClassExporterSupport
        .createServiceProxy(nodeId, connectionFactory));
    synchronized (this) {
      this.clusterNodes.put(nodeId, delegate)
    }

    log.info("Node registered [ID:" + nodeId + "]");

    // Notify Service Event
    ServiceMessage message = new ServiceMessage(nodeId.toString(),ServiceMessageType.NODE_REGISTERED);
    ServiceEventsSupport.getInstance().onServiceMessage(message);

    // Create HeartBeat Failure Hook
    ServiceEventsSupport.addServiceHook(new ServiceHookCallback() {
      public void onServiceEvent(ServiceMessage msg) {
        synchronized (this) {
          clusterNodes.remove(nodeId);
         
          // Notify Service Event
          ServiceMessage message = new ServiceMessage(nodeId.toString(),ServiceMessageType.NODE_UNREGISTERED);
          ServiceEventsSupport.getInstance().onServiceMessage(message);
        }   
      }
    }, nodeId.toString(), ServiceMessageType.HEARTBEAT_FAILED);
   
    // Start HeartBeat Tracking
    cluster.getHeartBeatService().addNode(nodeId);
   
    // Return Registration Data to Node
    return reg;
  }

  /**
   * {@inheritDoc}
   */
  public void unregisterNode(UUID id) {
    synchronized (this) {
      this.clusterNodes.remove(id);
    }
    ServiceMessage message = new ServiceMessage(id.toString(), ServiceMessageType.NODE_UNREGISTERED);
    cluster.getServiceMessageSender().sendServiceMessage(message);
    log.info("Node unregistered [ID:" + id + "]");
  }

  /**
   * Returns a reference to the {@code GridNodeDelegate} instance
   * which represents a given {@code GridNode}, identified by the
   * {@code nodeId}.
   *
   * @param nodeId {@code UUID} Node Id
   *
   * @return {@code GridNodeDelegate} delegate
   *
   * @throws IllegalArgumentException if no such node exists
   */
  public GridNodeDelegate getGridNodeDelegate(UUID nodeId) {
   
    if (this.clusterNodes.containsKey(nodeId)) {
      // If node exists, return
      return this.clusterNodes.get(nodeId);
    } else {
      throw new IllegalArgumentException(
          "No such Node registered with Id " + nodeId);
    }
  }

  /**
   * {@inheritDoc}
   */
  public int getNodeCount() {
    return clusterNodes.size();
  }

}
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