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
   *
   *     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.internal;
  
  import java.sql.Connection;
  import java.sql.PreparedStatement;
  import java.sql.ResultSet;
  import java.sql.SQLException;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Set;
  
  import org.apache.ambari.server.controller.jdbc.ConnectionFactory;
  import org.apache.ambari.server.controller.jdbc.JobHistoryPostgresConnectionFactory;
  import org.apache.ambari.server.controller.spi.NoSuchParentResourceException;
  import org.apache.ambari.server.controller.spi.NoSuchResourceException;
  import org.apache.ambari.server.controller.spi.Predicate;
  import org.apache.ambari.server.controller.spi.Request;
  import org.apache.ambari.server.controller.spi.RequestStatus;
  import org.apache.ambari.server.controller.spi.Resource;
  import org.apache.ambari.server.controller.spi.Resource.Type;
  import org.apache.ambari.server.controller.spi.ResourceAlreadyExistsException;
  import org.apache.ambari.server.controller.spi.SystemException;
  import org.apache.ambari.server.controller.spi.UnsupportedPropertyException;
  import org.apache.ambari.server.controller.utilities.PropertyHelper;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.common.collect.ImmutableMap;
  import com.google.common.collect.ImmutableSet;
  
  /**
   * Resource provider for job resources.
   */
  public class JobResourceProvider extends
      AbstractJDBCResourceProvider<JobResourceProvider.JobFields> {
    private static final Logger LOG = LoggerFactory.getLogger(JobResourceProvider.class);
  
    protected static final String JOB_CLUSTER_NAME_PROPERTY_ID = PropertyHelper
        .getPropertyId("Job", "cluster_name");
    protected static final String JOB_WORKFLOW_ID_PROPERTY_ID = PropertyHelper
        .getPropertyId("Job", "workflow_id");
    protected static final String JOB_ID_PROPERTY_ID = PropertyHelper
        .getPropertyId("Job", "job_id");
    protected static final String JOB_NAME_PROPERTY_ID = PropertyHelper
        .getPropertyId("Job", "name");
    protected static final String JOB_STATUS_PROPERTY_ID = PropertyHelper
        .getPropertyId("Job", "status");
    protected static final String JOB_USER_NAME_PROPERTY_ID = PropertyHelper
        .getPropertyId("Job", "user_name");
    protected static final String JOB_SUBMIT_TIME_PROPERTY_ID = PropertyHelper
        .getPropertyId("Job", "submit_time");
    protected static final String JOB_ELAPSED_TIME_PROPERTY_ID = PropertyHelper
        .getPropertyId("Job", "elapsed_time");
    protected static final String JOB_MAPS_PROPERTY_ID = PropertyHelper
        .getPropertyId("Job", "maps");
    protected static final String JOB_REDUCES_PROPERTY_ID = PropertyHelper
        .getPropertyId("Job", "reduces");
    protected static final String JOB_INPUT_BYTES_PROPERTY_ID = PropertyHelper
        .getPropertyId("Job", "input_bytes");
    protected static final String JOB_OUTPUT_BYTES_PROPERTY_ID = PropertyHelper
        .getPropertyId("Job", "output_bytes");
    protected static final String JOB_CONF_PATH_PROPERTY_ID = PropertyHelper
        .getPropertyId("Job", "conf_path");
    protected static final String JOB_WORKFLOW_ENTITY_NAME_PROPERTY_ID = PropertyHelper
        .getPropertyId("Job", "workflow_entity_name");
  
    protected JobFetcher jobFetcher;
  
    /**
     * The key property ids for a Job resource.
     */
    protected static final Map<Resource.Type, String> keyPropertyIds = ImmutableMap.<Resource.Type, String>builder()
        .put(Type.Cluster, JOB_CLUSTER_NAME_PROPERTY_ID)
        .put(Type.Workflow, JOB_WORKFLOW_ID_PROPERTY_ID)
        .put(Type.Job, JOB_ID_PROPERTY_ID)
        .build();
  
    /**
     * The property ids for a Job resource.
     */
    protected static final Set<String> propertyIds = ImmutableSet.of(
        JOB_CLUSTER_NAME_PROPERTY_ID,
        JOB_WORKFLOW_ID_PROPERTY_ID,
        JOB_ID_PROPERTY_ID,
        JOB_NAME_PROPERTY_ID,
        JOB_STATUS_PROPERTY_ID,
        JOB_USER_NAME_PROPERTY_ID,
        JOB_SUBMIT_TIME_PROPERTY_ID,
        JOB_ELAPSED_TIME_PROPERTY_ID,
        JOB_MAPS_PROPERTY_ID,
        JOB_REDUCES_PROPERTY_ID,
        JOB_INPUT_BYTES_PROPERTY_ID,
        JOB_OUTPUT_BYTES_PROPERTY_ID,
        JOB_CONF_PATH_PROPERTY_ID,
        JOB_WORKFLOW_ENTITY_NAME_PROPERTY_ID);
  
    /**
     * Create a new job resource provider.
     */
    protected JobResourceProvider() {
      super(propertyIds, keyPropertyIds);
      jobFetcher = new PostgresJobFetcher(
          new JobHistoryPostgresConnectionFactory());
    }
  
    /**
     * Create a new job resource provider.
     * 
     * @param jobFetcher
     *          job fetcher
     */
    protected JobResourceProvider(JobFetcher jobFetcher) {
      super(propertyIds, keyPropertyIds);
      this.jobFetcher = jobFetcher;
    }
  
    @Override
    public RequestStatus createResources(Request request) throws SystemException,
        UnsupportedPropertyException, ResourceAlreadyExistsException,
        NoSuchParentResourceException {
      throw new UnsupportedOperationException();
    }
  
    @Override
    public Set<Resource> getResources(Request request, Predicate predicate)
        throws SystemException, UnsupportedPropertyException,
        NoSuchResourceException, NoSuchParentResourceException {
  
      Set<Resource> resourceSet = new HashSet<>();
      Set<String> requestedIds = getRequestPropertyIds(request, predicate);
  
      Set<Map<String,Object>> predicatePropertieSet = getPropertyMaps(predicate);
      for (Map<String,Object> predicateProperties : predicatePropertieSet) {
        String clusterName = (String) predicateProperties
            .get(JOB_CLUSTER_NAME_PROPERTY_ID);
        String workflowId = (String) predicateProperties
            .get(JOB_WORKFLOW_ID_PROPERTY_ID);
        String jobId = (String) predicateProperties.get(JOB_ID_PROPERTY_ID);
        resourceSet.addAll(jobFetcher.fetchJobDetails(requestedIds, clusterName,
            workflowId, jobId));
      }
      return resourceSet;
    }
  
    @Override
    public RequestStatus updateResources(Request request, Predicate predicate)
        throws SystemException, UnsupportedPropertyException,
        NoSuchResourceException, NoSuchParentResourceException {
      throw new UnsupportedOperationException();
    }
  
    @Override
    public RequestStatus deleteResources(Request request, Predicate predicate)
        throws SystemException, UnsupportedPropertyException,
        NoSuchResourceException, NoSuchParentResourceException {
      throw new UnsupportedOperationException();
    }
  
    @Override
    protected Set<String> getPKPropertyIds() {
      return new HashSet<>(keyPropertyIds.values());
    }
  
    @Override
    public Map<Type,String> getKeyPropertyIds() {
      return keyPropertyIds;
    }
  
    /**
     * Simple interface for fetching jobs from db.
     */
    public interface JobFetcher {
      /**
       * Fetch job resources.
       * 
       * @param requestedIds
       *          fields to pull from db
       * @param clusterName
       *          the cluster name
       * @param workflowId
       *          the workflow id
       * @param jobId
       *          the job id
       * @return a set of job resources
       */
      Set<Resource> fetchJobDetails(Set<String> requestedIds,
                                    String clusterName, String workflowId, String jobId);
    }
  
    /**
     * A job fetcher that queries a postgres job table.
     */
    protected class PostgresJobFetcher implements JobFetcher {
      private static final String JOB_TABLE_NAME = "job";
      private ConnectionFactory connectionFactory;
      Connection db;
      PreparedStatement ps;
  
      /**
       * Create a postgres job fetcher that uses a given connection factory.
       * 
       * @param connectionFactory
       *          a connection factory
       */
      public PostgresJobFetcher(ConnectionFactory connectionFactory) {
        this.connectionFactory = connectionFactory;
        this.db = null;
        this.ps = null;
      }
  
      protected ResultSet getResultSet(Set<String> requestedIds,
          String workflowId, String jobId) throws SQLException {
        db = null;
        ps = null;
        db = connectionFactory.getConnection();
        String fields = getDBFieldString(requestedIds);
        if (requestedIds.contains(JOB_ELAPSED_TIME_PROPERTY_ID)
            && !requestedIds.contains(JOB_SUBMIT_TIME_PROPERTY_ID))
          fields += "," + getDBField(JOB_SUBMIT_TIME_PROPERTY_ID);
        if (jobId == null) {
          ps = db.prepareStatement("SELECT " + fields + " FROM " + JOB_TABLE_NAME
              + " WHERE " + JobFields.WORKFLOWID + " = ?");
          ps.setString(1, workflowId);
        } else {
          ps = db.prepareStatement("SELECT " + fields + " FROM " + JOB_TABLE_NAME
              + " WHERE " + JobFields.JOBID + " = ?");
          ps.setString(1, jobId);
        }
        return ps.executeQuery();
      }
  
      protected void close() {
        if (ps != null)
          try {
            ps.close();
          } catch (SQLException e) {
            LOG.error("Exception while closing statment", e);
          }
  
        if (db != null)
          try {
            db.close();
          } catch (SQLException e) {
            LOG.error("Exception while closing connection", e);
          }
      }
  
      @Override
      public Set<Resource> fetchJobDetails(Set<String> requestedIds,
          String clusterName, String workflowId, String jobId) {
        Set<Resource> jobs = new HashSet<>();
        ResultSet rs = null;
        try {
          rs = getResultSet(requestedIds, workflowId, jobId);
          while (rs.next()) {
            Resource resource = new ResourceImpl(Resource.Type.Job);
            setResourceProperty(resource, JOB_CLUSTER_NAME_PROPERTY_ID,
                clusterName, requestedIds);
            setString(resource, JOB_ID_PROPERTY_ID, rs, requestedIds);
            setString(resource, JOB_NAME_PROPERTY_ID, rs, requestedIds);
            setString(resource, JOB_STATUS_PROPERTY_ID, rs, requestedIds);
            setString(resource, JOB_USER_NAME_PROPERTY_ID, rs, requestedIds);
            if (requestedIds.contains(JOB_SUBMIT_TIME_PROPERTY_ID)
                || requestedIds.contains(JOB_ELAPSED_TIME_PROPERTY_ID)) {
              long submitTime = rs.getLong(JobFields.SUBMITTIME.toString());
              if (requestedIds.contains(JOB_SUBMIT_TIME_PROPERTY_ID))
                setResourceProperty(resource, JOB_SUBMIT_TIME_PROPERTY_ID,
                    submitTime, requestedIds);
              if (requestedIds.contains(JOB_ELAPSED_TIME_PROPERTY_ID)) {
                long finishTime = rs.getLong(JobFields.FINISHTIME.toString());
                if (finishTime > submitTime)
                  setResourceProperty(resource, JOB_ELAPSED_TIME_PROPERTY_ID,
                      finishTime - submitTime, requestedIds);
                else
                  setResourceProperty(resource, JOB_ELAPSED_TIME_PROPERTY_ID, 0l,
                      requestedIds);
              }
            }
            setInt(resource, JOB_MAPS_PROPERTY_ID, rs, requestedIds);
            setInt(resource, JOB_REDUCES_PROPERTY_ID, rs, requestedIds);
            setLong(resource, JOB_INPUT_BYTES_PROPERTY_ID, rs, requestedIds);
            setLong(resource, JOB_OUTPUT_BYTES_PROPERTY_ID, rs, requestedIds);
            setString(resource, JOB_CONF_PATH_PROPERTY_ID, rs, requestedIds);
            setString(resource, JOB_WORKFLOW_ID_PROPERTY_ID, rs, requestedIds);
            setString(resource, JOB_WORKFLOW_ENTITY_NAME_PROPERTY_ID, rs,
                requestedIds);
            jobs.add(resource);
          }
        } catch (SQLException e) {
          if (LOG.isDebugEnabled())
            LOG.debug("Caught exception getting resource.", e);
          return Collections.emptySet();
        } finally {
          if (rs != null)
            try {
              rs.close();
            } catch (SQLException e) {
              LOG.error("Exception while closing ResultSet", e);
            }
  
          close();
        }
        return jobs;
      }
    }
  
    /**
     * Enumeration of db fields for the job table.
     */
    enum JobFields {
      JOBID,
      JOBNAME,
      STATUS,
      USERNAME,
      SUBMITTIME,
      FINISHTIME,
      MAPS,
      REDUCES,
      INPUTBYTES,
      OUTPUTBYTES,
      CONFPATH,
      WORKFLOWID,
      WORKFLOWENTITYNAME
    }
  
    @Override
    protected Map<String,JobFields> getDBFieldMap() {
      Map<String,JobFields> dbFields = new HashMap<>();
      dbFields.put(JOB_WORKFLOW_ID_PROPERTY_ID, JobFields.WORKFLOWID);
      dbFields.put(JOB_ID_PROPERTY_ID, JobFields.JOBID);
      dbFields.put(JOB_NAME_PROPERTY_ID, JobFields.JOBNAME);
      dbFields.put(JOB_STATUS_PROPERTY_ID, JobFields.STATUS);
      dbFields.put(JOB_USER_NAME_PROPERTY_ID, JobFields.USERNAME);
      dbFields.put(JOB_SUBMIT_TIME_PROPERTY_ID, JobFields.SUBMITTIME);
      dbFields.put(JOB_ELAPSED_TIME_PROPERTY_ID, JobFields.FINISHTIME);
      dbFields.put(JOB_MAPS_PROPERTY_ID, JobFields.MAPS);
      dbFields.put(JOB_REDUCES_PROPERTY_ID, JobFields.REDUCES);
      dbFields.put(JOB_INPUT_BYTES_PROPERTY_ID, JobFields.INPUTBYTES);
      dbFields.put(JOB_OUTPUT_BYTES_PROPERTY_ID, JobFields.OUTPUTBYTES);
      dbFields.put(JOB_CONF_PATH_PROPERTY_ID, JobFields.CONFPATH);
      dbFields.put(JOB_WORKFLOW_ENTITY_NAME_PROPERTY_ID,
          JobFields.WORKFLOWENTITYNAME);
      return dbFields;
    }
  }
  