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
   * <p/>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p/>
   * 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.ambari.server.metrics.system.impl;
  
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.util.TreeSet;
  
  import org.apache.commons.lang.StringUtils;
  import org.eclipse.persistence.sessions.SessionProfiler;
  import org.eclipse.persistence.tools.profiler.PerformanceMonitor;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.inject.Singleton;
  
  /**
   * Class to extend the EclipseLink PerformanceMonitor, and dump the collected metrics to the AmbariServer Database Metrics source.
   */
  @Singleton
  public class AmbariPerformanceMonitor extends PerformanceMonitor {
    private static final Logger LOG = LoggerFactory.getLogger(AmbariPerformanceMonitor.class);
    private boolean isInitialized = false;
    private DatabaseMetricsSource metricsSource;
    private static String entityPackagePrefix = "org.apache"; //Can be made into a set later if needed.
  
    public AmbariPerformanceMonitor() {
      super();
      LOG.info("AmbariPerformanceMonitor instantiated");
      init();
    }
  
     private void init() {
  
      if (metricsSource == null) {
        metricsSource = (DatabaseMetricsSource) MetricsServiceImpl.getSource("database");
      }
  
      if (metricsSource != null) {
        LOG.info("AmbariPerformanceMonitor initialized");
  
        long interval = Long.parseLong(metricsSource.getConfigurationValue("dumptime", "60000"));
        this.setDumpTime(interval);
  
        String profileWeight = metricsSource.getConfigurationValue("query.weight", "HEAVY");
        this.setProfileWeight(getWeight(profileWeight));
  
        isInitialized = true;
  
      } else {
        LOG.info("AmbariPerformanceMonitor not yet initialized.");
      }
    }
  
    /**
     * Overridden dump metrics method for dumping Metrics to source rather than writing to Log file.
     */
    @Override
    public void dumpResults() {
  
      lastDumpTime = System.currentTimeMillis();
      Set<String> operations = new TreeSet<>(this.operationTimings.keySet());
      Map<String, Long> metrics = new HashMap<>();
  
      for (String operation : operations) {
  
        String[] splits = operation.split(":");
  
        Object value = this.operationTimings.get(operation);
        if (value == null) {
          value = Long.valueOf(0);
        }
        //Cleaning up metric names.
        if (value instanceof Long) {
          List<String> list = new ArrayList<>();
          for (int i = 0; i < splits.length; i++) {
            //Removing full package paths from Entity names
            if (splits[i].startsWith(entityPackagePrefix)) {
              String[] queryClassSplits = splits[i].split("\\.");
              list.add(queryClassSplits[queryClassSplits.length - 1]);
            } else if (splits[i] != null && !splits[i].equals("null")) {
              //Removing nulls in metric names.
              list.add(splits[i]);
            }
          }
          //Joining metric name portions by "." delimiter.
          metrics.put(StringUtils.join(list, "."), (Long)value);
        }
      }
      if (!metrics.isEmpty()) {
        if (!isInitialized) {
          init();
        }
        if (isInitialized) {
          LOG.debug("Publishing {} metrics to sink.", metrics.size());
          metricsSource.publish(metrics);
        }
      }
    }
  
    /**
     * Utlity method to get Profiling weight in Integer from String.
     * @param value NONE/HEAVY/ALL/NORMAL
     * @return SessionProfiler.HEAVY/NONE/ALL/NORMAL
     */
    private int getWeight(String value) {
  
      if (StringUtils.isEmpty(value) || value.equals("NONE")) {
        return SessionProfiler.NONE;
      }
  
      if (value.equals("ALL")) {
        return SessionProfiler.ALL;
      }
  
      if (value.equals("NORMAL")) {
        return SessionProfiler.NORMAL;
      }
  
      return SessionProfiler.HEAVY;
    }
  }
  