/*
Copyright 2013, Lorand Bendig
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 com.twitter.ambrose.hive.reporter;
import java.io.IOException;
import java.lang.reflect.Field;
import java.util.SortedMap;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.twitter.ambrose.hive.AmbroseHiveUtil;
import com.twitter.ambrose.model.Event;
import com.twitter.ambrose.server.ScriptStatusServer;
import com.twitter.ambrose.service.impl.InMemoryStatsService;
/**
* Subclass of {@link AmbroseHiveProgressReporter} that starts a ScriptStatusServer embedded in
* the running Hive client VM. Stats are collected using by this class via InMemoryStatsService,
* which is what serves stats to ScriptStatusServer.
*
* @author Lorand Bendig <lbendig@gmail.com>
*
*/
public class EmbeddedAmbroseHiveProgressReporter extends AmbroseHiveProgressReporter {
private static final Log LOG = LogFactory.getLog(EmbeddedAmbroseHiveProgressReporter.class);
private InMemoryStatsService service;
private ScriptStatusServer server;
/**
* internal eventMap field unfolded from InMemoryStatsService
* Needed to be able to save events of workflows and restore all of the
* when script is replayed at the end
*/
private SortedMap<Integer, Event<?>> _eventMap;
EmbeddedAmbroseHiveProgressReporter() {
super(new InMemoryStatsService());
this.service = (InMemoryStatsService) getStatsWriteService();
this.server = new ScriptStatusServer(service, service);
this.server.start();
initInternal();
}
@SuppressWarnings("unchecked")
private void initInternal() {
try {
Field eventMapField = AmbroseHiveUtil
.getInternalField(InMemoryStatsService.class, "eventMap");
_eventMap = (SortedMap<Integer, Event<?>>) eventMapField.get(service);
}
catch (Exception e) {
LOG.fatal("Can't access to eventMap/dagNodeNameMap fields at "
+ InMemoryStatsService.class.getName() + "!");
throw new RuntimeException("Incompatible Hive API found!", e);
}
}
/**
* Saves events and DAGNodes for a given workflow
*/
@Override
public void saveEventStack() {
allEvents.putAll(_eventMap);
allDagNodes.putAll(service.getDagNodeNameMap(null));
}
/**
* Restores events and DAGNodes of all workflows within a script This enables
* to replay all the workflows when the script finishes
*/
@Override
public void restoreEventStack() {
_eventMap.putAll(allEvents);
service.getDagNodeNameMap(null).putAll(allDagNodes);
}
public void stopServer() {
LOG.info("Stopping Ambrose Server...");
server.stop();
}
public void flushJsonToDisk() {
try {
service.flushJsonToDisk();
}
catch (IOException e) {
LOG.warn("Couldn't write json to disk", e);
}
}
@Override
public void resetAdditionals() {
_eventMap.clear();
}
}