code: /*
   * Copyright © 2014-2017 EntIT Software LLC, a Micro Focus company (L.P.)
   *
   * 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 io.cloudslang.worker.monitor.service;
  
  import io.cloudslang.score.events.EventBus;
  import io.cloudslang.score.events.ScoreEvent;
  import io.cloudslang.worker.management.monitor.WorkerStateUpdateService;
  import io.cloudslang.worker.monitor.PerfMetricCollector;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  import org.springframework.beans.factory.annotation.Autowired;
  
  import java.io.Serializable;
  import java.util.ArrayList;
  import java.util.Map;
  import java.util.concurrent.LinkedBlockingQueue;
  
  import static io.cloudslang.score.events.EventConstants.WORKER_PERFORMANCE_MONITOR;
  import static java.lang.Boolean.getBoolean;
  import static java.lang.Integer.getInteger;
  
  public class WorkerMetricsServiceImpl implements WorkerMetricsService {
      private static final Logger logger = LogManager.getLogger(WorkerMetricsServiceImpl.class);
      private static final int capacity = getInteger("metrics.collection.sampleCount", 10);
      private static final boolean disabled = getBoolean("worker.monitoring.disable");
  
      @Autowired
      private PerfMetricCollector perfMetricCollector;
  
      @Autowired
      private WorkerStateUpdateService workerStateUpdateService;
  
      private final LinkedBlockingQueue<Map<WorkerPerformanceMetric, Serializable>> collectMetricQueue =
              new LinkedBlockingQueue<>(capacity);
  
      @Autowired
      private EventBus eventBus;
  
      @Override
      public void collectPerformanceMetrics() {
          try {
              if (!isMonitoringDisabled()) {
                  Map<WorkerPerformanceMetric, Serializable> metricInfo = perfMetricCollector.collectMetrics();
                  collectMetricQueue.put(metricInfo);
              }
          } catch (Exception e) {
              logger.error("Failed to compute metric or collect metrics: ", e);
          }
      }
  
      @Override
      public void dispatchPerformanceMetrics() {
          try {
              if (!isMonitoringDisabled()) {
                  ArrayList<Map<WorkerPerformanceMetric, Serializable>> metricList = new ArrayList<>(collectMetricQueue.size());
                  collectMetricQueue.drainTo(metricList);
                  // Dispatch the event
                  eventBus.dispatch(new ScoreEvent(WORKER_PERFORMANCE_MONITOR, metricList));
              }
          } catch (Exception e) {
              logger.error("Failed to dispatch metric info event", e);
          }
      }
  
      private boolean isMonitoringDisabled() {
          return disabled || workerStateUpdateService.isMonitoringDisabled();
      }
  
  }
  