/*
* Copyright © 2014 Cask Data, Inc.
*
* 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 co.cask.cdap.data.stream.service;
import co.cask.cdap.common.conf.CConfiguration;
import co.cask.cdap.common.conf.Constants;
import co.cask.cdap.common.hooks.MetricsReporterHook;
import co.cask.cdap.common.logging.LoggingContextAccessor;
import co.cask.cdap.common.logging.ServiceLoggingContext;
import co.cask.cdap.common.metrics.MetricsCollectionService;
import co.cask.cdap.data.stream.StreamCoordinator;
import co.cask.http.HttpHandler;
import co.cask.http.NettyHttpService;
import com.google.common.base.Objects;
import com.google.common.collect.ImmutableList;
import com.google.common.util.concurrent.AbstractIdleService;
import com.google.inject.Inject;
import com.google.inject.name.Named;
import org.apache.twill.common.Cancellable;
import org.apache.twill.discovery.Discoverable;
import org.apache.twill.discovery.DiscoveryService;
import org.jboss.netty.buffer.HeapChannelBufferFactory;
import java.net.InetSocketAddress;
import java.util.Set;
import javax.annotation.Nullable;
/**
* A Http service endpoint that host the stream handler.
*/
public final class StreamHttpService extends AbstractIdleService {
private final DiscoveryService discoveryService;
private final NettyHttpService httpService;
private final StreamCoordinator streamCoordinator;
private final StreamFileJanitorService janitorService;
private Cancellable cancellable;
@Inject
public StreamHttpService(CConfiguration cConf, DiscoveryService discoveryService,
StreamCoordinator streamCoordinator,
StreamFileJanitorService janitorService,
@Named(Constants.Stream.STREAM_HANDLER) Set<HttpHandler> handlers,
@Nullable MetricsCollectionService metricsCollectionService) {
this.discoveryService = discoveryService;
this.streamCoordinator = streamCoordinator;
this.janitorService = janitorService;
int workerThreads = cConf.getInt(Constants.Stream.WORKER_THREADS, 10);
this.httpService = NettyHttpService.builder()
.addHttpHandlers(handlers)
.setHandlerHooks(ImmutableList.of(new MetricsReporterHook(metricsCollectionService,
Constants.Stream.STREAM_HANDLER)))
.setHost(cConf.get(Constants.Stream.ADDRESS))
.setWorkerThreadPoolSize(workerThreads)
.setExecThreadPoolSize(0) // Execution happens in the io worker thread directly
.setConnectionBacklog(20000)
.setChannelConfig("child.bufferFactory",
HeapChannelBufferFactory.getInstance()) // ChannelBufferFactory that always creates new Buffer
.build();
}
@Override
protected void startUp() throws Exception {
LoggingContextAccessor.setLoggingContext(new ServiceLoggingContext(Constants.Logging.SYSTEM_NAME,
Constants.Logging.COMPONENT_NAME,
Constants.Service.STREAMS));
httpService.startAndWait();
cancellable = discoveryService.register(new Discoverable() {
@Override
public String getName() {
return Constants.Service.STREAMS;
}
@Override
public InetSocketAddress getSocketAddress() {
return httpService.getBindAddress();
}
});
janitorService.startAndWait();
}
@Override
protected void shutDown() throws Exception {
janitorService.stopAndWait();
try {
if (cancellable != null) {
cancellable.cancel();
}
} finally {
httpService.stopAndWait();
streamCoordinator.close();
}
}
@Override
public String toString() {
return Objects.toStringHelper(this)
.add("bindAddress", httpService.getBindAddress())
.toString();
}
}