/*
* $Id: ControlSourceEventsRequestProcessor.java 169055 2011-02-26 01:01:19Z cbotev $
*/
package com.linkedin.databus.container.request;
/*
*
* Copyright 2013 LinkedIn Corp. All rights reserved
*
* 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.
*
*/
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.ExecutorService;
import com.linkedin.databus.container.netty.HttpRelay;
import com.linkedin.databus2.core.container.request.DatabusRequest;
import com.linkedin.databus2.core.container.request.InvalidRequestParamValueException;
import com.linkedin.databus2.core.container.request.RequestProcessingException;
import com.linkedin.databus2.core.container.request.RequestProcessor;
import com.linkedin.databus2.producers.EventProducer;
/**
* @author Jemiah Westerman<jwesterman@linkedin.com>
* @version $Revision: 169055 $
*/
public class ControlSourceEventsRequestProcessor
implements RequestProcessor
{
private final ExecutorService _executorService;
private List<EventProducer> _eventProducers;
public static final String COMMAND_NAME = "controlSources";
public static final String PARAM_SOURCE_NAMES = "sources";
public static final String PARAM_SCN = "scn";
public ControlSourceEventsRequestProcessor(ExecutorService executorService,
HttpRelay relay,
EventProducer eventProducer)
{
_executorService = executorService;
_eventProducers = new ArrayList<EventProducer>();
_eventProducers.add(eventProducer);
}
public ControlSourceEventsRequestProcessor(ExecutorService executorService,
HttpRelay relay,
List<EventProducer> eventProducers)
{
_executorService = executorService;
_eventProducers = new ArrayList<EventProducer>();
_eventProducers.addAll(eventProducers);
}
/** add more producers */
public void addEventProducers(List<EventProducer> eventProducers) {
_eventProducers.addAll(eventProducers);
}
/** remove some producers */
public void removeEventProducers(List<EventProducer> eventProducers) {
_eventProducers.removeAll(eventProducers);
}
private enum Actions
{
STATUS, START, PAUSE, UNPAUSE, SHUTDOWN;
}
/*
* @see com.linkedin.databus.container.request.RequestProcessor#getExecutorService()
*/
@Override
public ExecutorService getExecutorService()
{
return _executorService;
}
/*
* @see com.linkedin.databus.container.request.RequestProcessor#process(com.linkedin.databus.container.request.DatabusRequest)
*/
@Override
public DatabusRequest process(DatabusRequest request)
throws IOException, RequestProcessingException
{
// Read the action from the request
Actions action;
try
{
String strAction = request.getParams().getProperty(DatabusRequest.PATH_PARAM_NAME, "");
action = Actions.valueOf(strAction.toUpperCase());
}
catch(Exception ex)
{
throw new InvalidRequestParamValueException(COMMAND_NAME, "request path", request.getParams().getProperty(DatabusRequest.PATH_PARAM_NAME, ""));
}
switch(action)
{
case STATUS:
doStatus(request);
break;
case PAUSE:
doPause(request);
break;
case SHUTDOWN:
doShutdown(request);
break;
case START:
doStart(request);
break;
case UNPAUSE:
doUnpause(request);
break;
}
return null;
}
private void doStatus(DatabusRequest request)
throws IOException
{
Set<String> sources = getSourcesParam(request);
for(EventProducer producer : _eventProducers)
{
if(sources == null || sources.contains(producer.getName()))
{
String state;
if(producer.isRunning())
{
state = "running";
}
else if(producer.isPaused())
{
state = "paused";
}
else
{
state = "shutdown";
}
write(request, String.format("{\"name\" : \"%s\", \"status\" : \"%s\", \"SCN\" : %d}", producer.getName(), state, producer.getSCN()));
}
}
}
private void doPause(DatabusRequest request)
throws IOException
{
Set<String> sources = getSourcesParam(request);
for(EventProducer producer : _eventProducers)
{
if(sources == null || sources.contains(producer.getName()))
{
producer.pause();
}
}
doStatus(request);
}
private void doUnpause(DatabusRequest request)
throws IOException
{
Set<String> sources = getSourcesParam(request);
for(EventProducer producer : _eventProducers)
{
if(sources == null || sources.contains(producer.getName()))
{
producer.unpause();
}
}
doStatus(request);
}
private void doShutdown(DatabusRequest request)
throws IOException
{
Set<String> sources = getSourcesParam(request);
for(EventProducer producer : _eventProducers)
{
if(sources == null || sources.contains(producer.getName()))
{
producer.shutdown();
}
}
doStatus(request);
}
private void doStart(DatabusRequest request)
throws IOException, RequestProcessingException
{
Set<String> sources = getSourcesParam(request);
if(sources == null || sources.size() != 1)
{
throw new RequestProcessingException("start requires exactly one source be specified");
}
long scn = request.getOptionalLongParam(PARAM_SCN, -1L);
for(EventProducer producer : _eventProducers)
{
if(sources.contains(producer.getName()))
{
producer.start(scn);
write(request, String.format("{\"name\" : \"%s\", \"status\" : \"%s\", \"SCN\" : %d}", producer.getName(), "running", producer.getSCN()));
}
}
}
private Set<String> getSourcesParam(DatabusRequest request)
{
String s = request.getParams().getProperty(PARAM_SOURCE_NAMES);
if(s == null || s.length() == 0)
{
return null;
}
String[] sources = s.split(",");
Set<String> sourceSet = new HashSet<String>(sources.length);
sourceSet.addAll(Arrays.asList(sources));
return sourceSet;
}
private void write(DatabusRequest request, String str)
throws IOException
{
request.getResponseContent().write(ByteBuffer.wrap(str.getBytes(Charset.defaultCharset())));
}
}