branch-1.2/ambari-server/src/main/java/org/apache/ambari/server/controller/jmx/JMXPropertyProvider.java

/**
 * 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.ambari.server.controller.jmx;

import org.apache.ambari.server.controller.internal.AbstractPropertyProvider;
import org.apache.ambari.server.controller.internal.PropertyInfo;
import org.apache.ambari.server.controller.spi.*;
import org.apache.ambari.server.controller.utilities.StreamProvider;
import org.codehaus.jackson.map.DeserializationConfig;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.ObjectReader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * Property provider implementation for JMX sources.
 */
public class JMXPropertyProvider extends AbstractPropertyProvider {

  private static final String NAME_KEY = "name";
  private static final String PORT_KEY = "tag.port";

  private final StreamProvider streamProvider;

  private final JMXHostProvider jmxHostProvider;

  private static final Map<String, String> DEFAULT_JMX_PORTS = new HashMap<String, String>();

  private final String clusterNamePropertyId;

  private final String hostNamePropertyId;

  private final String componentNamePropertyId;

  private final static ObjectReader objectReader;


  static {
    DEFAULT_JMX_PORTS.put("NAMENODE",           "50070");
    DEFAULT_JMX_PORTS.put("DATANODE",           "50075");
    DEFAULT_JMX_PORTS.put("JOBTRACKER",         "50030");
    DEFAULT_JMX_PORTS.put("TASKTRACKER",        "50060");
    DEFAULT_JMX_PORTS.put("HBASE_MASTER",       "60010");
    DEFAULT_JMX_PORTS.put("HBASE_REGIONSERVER", "60030");

    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.configure(DeserializationConfig.Feature.USE_ANNOTATIONS, false);
    objectReader = objectMapper.reader(JMXMetricHolder.class);
  }

  protected final static Logger LOG =
      LoggerFactory.getLogger(JMXPropertyProvider.class);


  // ----- Constructors ------------------------------------------------------

  /**
   * Create a JMX property provider.
   *
   * @param componentMetrics         the map of supported metrics
   * @param streamProvider           the stream provider
   * @param jmxHostProvider          the host mapping
   * @param clusterNamePropertyId    the cluster name property id
   * @param hostNamePropertyId       the host name property id
   * @param componentNamePropertyId  the component name property id
   */
  public JMXPropertyProvider(Map<String, Map<String, PropertyInfo>> componentMetrics,
                             StreamProvider streamProvider,
                             JMXHostProvider jmxHostProvider,
                             String clusterNamePropertyId,
                             String hostNamePropertyId,
                             String componentNamePropertyId) {

    super(componentMetrics);

    this.streamProvider           = streamProvider;
    this.jmxHostProvider          = jmxHostProvider;
    this.clusterNamePropertyId    = clusterNamePropertyId;
    this.hostNamePropertyId       = hostNamePropertyId;
    this.componentNamePropertyId  = componentNamePropertyId;
  }


  // ----- PropertyProvider --------------------------------------------------

  @Override
  public Set<Resource> populateResources(Set<Resource> resources, Request request, Predicate predicate)
      throws SystemException {


    Set<Resource> keepers = new HashSet<Resource>();
    for (Resource resource : resources) {
      if (populateResource(resource, request, predicate)) {
        keepers.add(resource);
      }
    }
    return keepers;
  }


  // ----- helper methods ----------------------------------------------------

  /**
   * Get the spec to locate the JMX stream from the given host and port
   *
   * @param hostName  the host name
   * @param port      the port
   *
   * @return the spec
   */
  protected String getSpec(String hostName, String port) {
    return "http://" + hostName + ":" + port + "/jmx";
  }

  /**
   * Populate a resource by obtaining the requested JMX properties.
   *
   * @param resource  the resource to be populated
   * @param request   the request
   * @param predicate the predicate
   *
   * @return true if the resource was successfully populated with the requested properties
   */
  private boolean populateResource(Resource resource, Request request, Predicate predicate)
      throws SystemException {

    Set<String> ids = getRequestPropertyIds(request, predicate);
    if (ids.isEmpty()) {
      return true;
    }

    String componentName = (String) resource.getPropertyValue(componentNamePropertyId);

    if (getComponentMetrics().get(componentName) == null) {
      // If there are no metrics defined for the given component then there is nothing to do.
      return true;
    }

    String clusterName = (String) resource.getPropertyValue(clusterNamePropertyId);

    String port = getPort(clusterName, componentName);
    if (port == null) {
      String error = "Unable to get JMX metrics.  No port value for " + componentName;
      logError(error, null);
      throw new SystemException(error, null);
    }

    String hostName = getHost(resource, clusterName, componentName);
    if (hostName == null) {
      String error = "Unable to get JMX metrics.  No host name for " + componentName;
      logError(error, null);
      throw new SystemException(error, null);
    }

    String      spec = getSpec(hostName, port);
    InputStream in   = null;
    try {
      in = streamProvider.readFrom(spec);
      JMXMetricHolder metricHolder = objectReader.readValue(in);

      Map<String, Map<String, Object>> categories = new HashMap<String, Map<String, Object>>();

      for (Map<String, Object> bean : metricHolder.getBeans()) {
        String category = getCategory(bean);
        if (category != null) {
          categories.put(category, bean);
        }
      }

      for (String propertyId : ids) {
        Map<String, PropertyInfo> propertyInfoMap = getPropertyInfoMap(componentName, propertyId);

        for (Map.Entry<String, PropertyInfo> entry : propertyInfoMap.entrySet()) {

          PropertyInfo propertyInfo = entry.getValue();
          propertyId = entry.getKey();

          if (propertyInfo.isPointInTime()) {

            String property = propertyInfo.getPropertyId();
            String category = "";

            List<String> keyList = new LinkedList<String>();
            int keyStartIndex = property.indexOf('[', 0);
            int firstKeyIndex = keyStartIndex > -1 ? keyStartIndex : property.length();
            while (keyStartIndex > -1) {
              int keyEndIndex = property.indexOf(']', keyStartIndex);
              if (keyEndIndex > -1 & keyEndIndex > keyStartIndex) {
                keyList.add(property.substring(keyStartIndex + 1, keyEndIndex));
                keyStartIndex = property.indexOf('[', keyEndIndex);
              }
              else {
                keyStartIndex = -1;
              }
            }

            int dotIndex = property.lastIndexOf('.', firstKeyIndex - 1);
            if (dotIndex != -1){
              category = property.substring(0, dotIndex);
              property = property.substring(dotIndex + 1, firstKeyIndex);
            }

            Map<String, Object> properties = categories.get(category);
            if (properties != null && properties.containsKey(property)) {
              Object value = properties.get(property);
              if (keyList.size() > 0 && value instanceof Map) {
                Map map = (Map) value;
                for (String key : keyList) {
                  value = map.get(key);
                  if (value instanceof Map) {
                    map = (Map) value;
                  }
                  else {
                    break;
                  }
                }
              }
              resource.setProperty(propertyId, value);
            }
          }
        }
      }
    } catch (IOException e) {
      logError(spec, e);
    } finally {
      if (in != null) {
        try {
          in.close();
        } catch (IOException e) {
            logError("Unable to close http input steam : spec=" + spec, e);
        }
      }
    }

    return true;
  }

  private String getPort(String clusterName, String componentName) throws SystemException {
    String port = jmxHostProvider.getPort(clusterName, componentName);
    return port == null ? DEFAULT_JMX_PORTS.get(componentName) : port;
  }

  private String getHost(Resource resource, String clusterName, String componentName) throws SystemException {
    return hostNamePropertyId == null ?
        jmxHostProvider.getHostName(clusterName, componentName) :
        (String) resource.getPropertyValue(hostNamePropertyId);
  }

  private String getCategory(Map<String, Object> bean) {
    if (bean.containsKey(NAME_KEY)) {
      String name = (String) bean.get(NAME_KEY);

      if (bean.containsKey(PORT_KEY)) {
        String port = (String) bean.get(PORT_KEY);
        name = name.replace("ForPort" + port, "");
      }
      return name;
    }
    return null;
  }

  private static void logError(String error, IOException e) {
    if (LOG.isErrorEnabled()) {
      if (e == null) {
        LOG.error("Caught exception getting JMX metrics : spec=" + error);
      } else {
        LOG.error("Caught exception getting JMX metrics : spec=" + error, e);
      }
    }
  }
}