/*
 * 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.uima.ducc.agent.processors;

import java.util.TreeMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

import org.apache.camel.Exchange;
import org.apache.uima.ducc.agent.Agent;
import org.apache.uima.ducc.agent.NodeAgent;
import org.apache.uima.ducc.agent.metrics.collectors.DefaultNodeLoadAverageCollector;
import org.apache.uima.ducc.agent.metrics.collectors.DefaultNodeMemoryCollector;
import org.apache.uima.ducc.agent.metrics.collectors.NodeCpuCollector;
import org.apache.uima.ducc.agent.metrics.collectors.NodeUsersCollector;
import org.apache.uima.ducc.common.DuccNode;
import org.apache.uima.ducc.common.Node;
import org.apache.uima.ducc.common.agent.metrics.memory.NodeMemory;
import org.apache.uima.ducc.common.node.metrics.NodeCpuInfo;
import org.apache.uima.ducc.common.node.metrics.NodeLoadAverage;
import org.apache.uima.ducc.common.node.metrics.NodeMetrics;
import org.apache.uima.ducc.common.node.metrics.NodeUsersInfo;
import org.apache.uima.ducc.common.utils.DuccLogger;
import org.apache.uima.ducc.transport.event.NodeMetricsUpdateDuccEvent;

public class DefaultNodeMetricsProcessor extends BaseProcessor implements NodeMetricsProcessor {
  private NodeAgent agent;

  private ExecutorService pool = Executors.newFixedThreadPool(1);

  DuccLogger logger = DuccLogger.getLogger(this.getClass(), Agent.COMPONENT_NAME);

  /*
   * public DefaultNodeMetricsProcessor(final NodeAgent agent) throws Exception { this.agent =
   * agent; }
   */
  public void setAgent(NodeAgent agent) {
    this.agent = agent;
  }

  public void process(Exchange exchange) throws Exception {
    String methodName = "process";
    try {

      DefaultNodeMemoryCollector collector = new DefaultNodeMemoryCollector();
      Future<NodeMemory> nmiFuture = pool.submit(collector);

      DefaultNodeLoadAverageCollector loadAvgCollector = new DefaultNodeLoadAverageCollector();
      Future<NodeLoadAverage> loadFuture = pool.submit(loadAvgCollector);

      NodeCpuCollector cpuCollector = new NodeCpuCollector();
      // Future<NodeCpuInfo> cpuFuture = pool.submit(cpuCollector);

      NodeCpuInfo cpuInfo = new NodeCpuInfo(agent.numProcessors,
              cpuCollector.call().getCurrentLoad());

      NodeUsersCollector nodeUsersCollector = new NodeUsersCollector(agent, logger);
      Future<TreeMap<String, NodeUsersInfo>> nuiFuture = pool.submit(nodeUsersCollector);
      boolean cpuReportingEnabled = agent.cgroupsManager.isCpuReportingEnabled();

      NodeMetrics nodeMetrics = new NodeMetrics(agent.getIdentity(), nmiFuture.get(),
              loadFuture.get(), cpuInfo, nuiFuture.get(), cpuReportingEnabled);
      if (agent.isStopping()) {
        nodeMetrics.disableNode(); // sends Unavailable status to clients (RM,WS)
        logger.info(methodName, null, ">>>>>>>>>>>>>>>>> Agent publishing State="
                + nodeMetrics.getNodeStatus() + " in Outgoing NodeMetrics");
      }
      // Node node = new DuccNode(new NodeIdentity(), nodeMetrics);
      // jrc 2011-07-30 I think this needs to be agent.getIdentity(), not create a new identity.
      Node node = new DuccNode(agent.getIdentity(), nodeMetrics, agent.useCgroups);

      // Make the agent aware how much memory is available on the node. Do this once.
      if (agent.getNodeInfo() == null) {
        agent.setNodeInfo(node);
      }
      logger.info(methodName, null, "... Agent " + node.getNodeIdentity().getCanonicalName()
              + " Posting Users:" + node.getNodeMetrics().getNodeUsersMap().size());

      NodeMetricsUpdateDuccEvent event = new NodeMetricsUpdateDuccEvent(node,
              agent.getInventoryRef().size());
      exchange.getIn().setBody(event, NodeMetricsUpdateDuccEvent.class);

    } catch (Exception e) {
      e.printStackTrace();
    }

  }

}