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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.http.netty;
import org.elasticsearch.common.Booleans;
import com.carrotsearch.hppc.IntHashSet;
import com.carrotsearch.hppc.IntSet;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.component.AbstractLifecycleComponent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.netty.NettyUtils;
import org.elasticsearch.common.netty.OpenChannelsHandler;
import org.elasticsearch.common.network.NetworkAddress;
import org.elasticsearch.common.network.NetworkService;
import org.elasticsearch.common.network.NetworkUtils;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.*;
import org.elasticsearch.common.unit.ByteSizeUnit;
import org.elasticsearch.common.unit.ByteSizeValue;
import org.elasticsearch.common.util.BigArrays;
import org.elasticsearch.common.util.concurrent.EsExecutors;
import org.elasticsearch.http.netty.pipelining.HttpPipeliningHandler;
import org.elasticsearch.monitor.jvm.JvmInfo;
import org.elasticsearch.http.BindHttpException;
import org.elasticsearch.http.HttpInfo;
import org.elasticsearch.http.HttpServerAdapter;
import org.elasticsearch.http.HttpServerTransport;
import org.elasticsearch.http.HttpStats;
import org.elasticsearch.http.netty.cors.CorsConfig;
import org.elasticsearch.http.netty.cors.CorsConfigBuilder;
import org.elasticsearch.http.netty.cors.CorsHandler;
import org.elasticsearch.http.netty.pipelining.HttpPipeliningHandler;
import org.elasticsearch.monitor.jvm.JvmInfo;
import org.elasticsearch.rest.RestChannel;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.support.RestUtils;
import org.elasticsearch.transport.BindTransportException;
import org.jboss.netty.bootstrap.ServerBootstrap;
import org.jboss.netty.channel.*;
import org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory;
import org.jboss.netty.channel.socket.oio.OioServerSocketChannelFactory;
import org.jboss.netty.handler.codec.http.HttpChunkAggregator;
import org.jboss.netty.handler.codec.http.HttpContentCompressor;
import org.jboss.netty.handler.codec.http.HttpMethod;
import org.jboss.netty.handler.codec.http.HttpRequestDecoder;
import org.jboss.netty.handler.timeout.ReadTimeoutException;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicReference;
import java.util.regex.Pattern;
import static org.elasticsearch.common.network.NetworkService.TcpSettings.*;
import static org.elasticsearch.common.util.concurrent.EsExecutors.daemonThreadFactory;
import static org.elasticsearch.common.network.NetworkService.TcpSettings.TCP_BLOCKING;
import static org.elasticsearch.common.network.NetworkService.TcpSettings.TCP_KEEP_ALIVE;
import static org.elasticsearch.common.network.NetworkService.TcpSettings.TCP_NO_DELAY;
import static org.elasticsearch.common.network.NetworkService.TcpSettings.TCP_RECEIVE_BUFFER_SIZE;
import static org.elasticsearch.common.network.NetworkService.TcpSettings.TCP_REUSE_ADDRESS;
import static org.elasticsearch.common.network.NetworkService.TcpSettings.TCP_SEND_BUFFER_SIZE;
import static org.elasticsearch.http.netty.cors.CorsHandler.ANY_ORIGIN;
/**
*
*/
public class NettyHttpServerTransport extends AbstractLifecycleComponent implements HttpServerTransport {
static {
NettyUtils.setup();
}
public static final String SETTING_CORS_ENABLED = "http.cors.enabled";
public static final String SETTING_CORS_ALLOW_ORIGIN = "http.cors.allow-origin";
public static final String SETTING_CORS_MAX_AGE = "http.cors.max-age";
public static final String SETTING_CORS_ALLOW_METHODS = "http.cors.allow-methods";
public static final String SETTING_CORS_ALLOW_HEADERS = "http.cors.allow-headers";
public static final String SETTING_CORS_ALLOW_CREDENTIALS = "http.cors.allow-credentials";
public static final String SETTING_PIPELINING = "http.pipelining";
public static final String SETTING_PIPELINING_MAX_EVENTS = "http.pipelining.max_events";
public static final String SETTING_HTTP_COMPRESSION = "http.compression";
public static final String SETTING_HTTP_COMPRESSION_LEVEL = "http.compression_level";
public static final String SETTING_HTTP_DETAILED_ERRORS_ENABLED = "http.detailed_errors.enabled";
public static final boolean DEFAULT_SETTING_PIPELINING = true;
public static final int DEFAULT_SETTING_PIPELINING_MAX_EVENTS = 10000;
public static final String DEFAULT_PORT_RANGE = "9200-9300";
private static final String[] DEFAULT_CORS_METHODS = { "OPTIONS", "HEAD", "GET", "POST", "PUT", "DELETE" };
private static final String[] DEFAULT_CORS_HEADERS = { "X-Requested-With", "Content-Type", "Content-Length" };
private static final int DEFAULT_CORS_MAX_AGE = 1728000;
protected final NetworkService networkService;
protected final BigArrays bigArrays;
protected final ByteSizeValue maxContentLength;
protected final ByteSizeValue maxInitialLineLength;
protected final ByteSizeValue maxHeaderSize;
protected final ByteSizeValue maxChunkSize;
protected final int workerCount;
protected final boolean blockingServer;
protected final boolean pipelining;
protected final int pipeliningMaxEvents;
protected final boolean compression;
protected final int compressionLevel;
protected final boolean resetCookies;
protected final String port;
protected final String bindHosts[];
protected final String publishHosts[];
protected final boolean detailedErrorsEnabled;
protected final String tcpNoDelay;
protected final String tcpKeepAlive;
protected final boolean reuseAddress;
protected final ByteSizeValue tcpSendBufferSize;
protected final ByteSizeValue tcpReceiveBufferSize;
protected final ReceiveBufferSizePredictorFactory receiveBufferSizePredictorFactory;
protected final ByteSizeValue maxCumulationBufferCapacity;
protected final int maxCompositeBufferComponents;
protected volatile ServerBootstrap serverBootstrap;
protected volatile BoundTransportAddress boundAddress;
protected volatile List serverChannels = new ArrayList<>();
// package private for testing
OpenChannelsHandler serverOpenChannels;
protected volatile HttpServerAdapter httpServerAdapter;
private final CorsConfig corsConfig;
@Inject
public NettyHttpServerTransport(Settings settings, NetworkService networkService, BigArrays bigArrays) {
super(settings);
this.networkService = networkService;
this.bigArrays = bigArrays;
if (settings.getAsBoolean("netty.epollBugWorkaround", false)) {
System.setProperty("org.jboss.netty.epollBugWorkaround", "true");
}
ByteSizeValue maxContentLength = settings.getAsBytesSize("http.netty.max_content_length", settings.getAsBytesSize("http.max_content_length", new ByteSizeValue(100, ByteSizeUnit.MB)));
this.maxChunkSize = settings.getAsBytesSize("http.netty.max_chunk_size", settings.getAsBytesSize("http.max_chunk_size", new ByteSizeValue(8, ByteSizeUnit.KB)));
this.maxHeaderSize = settings.getAsBytesSize("http.netty.max_header_size", settings.getAsBytesSize("http.max_header_size", new ByteSizeValue(8, ByteSizeUnit.KB)));
this.maxInitialLineLength = settings.getAsBytesSize("http.netty.max_initial_line_length", settings.getAsBytesSize("http.max_initial_line_length", new ByteSizeValue(4, ByteSizeUnit.KB)));
// don't reset cookies by default, since I don't think we really need to
// note, parsing cookies was fixed in netty 3.5.1 regarding stack allocation, but still, currently, we don't need cookies
this.resetCookies = settings.getAsBoolean("http.netty.reset_cookies", settings.getAsBoolean("http.reset_cookies", false));
this.maxCumulationBufferCapacity = settings.getAsBytesSize("http.netty.max_cumulation_buffer_capacity", null);
this.maxCompositeBufferComponents = settings.getAsInt("http.netty.max_composite_buffer_components", -1);
this.workerCount = settings.getAsInt("http.netty.worker_count", EsExecutors.boundedNumberOfProcessors(settings) * 2);
this.blockingServer = settings.getAsBoolean("http.netty.http.blocking_server", settings.getAsBoolean(TCP_BLOCKING_SERVER, settings.getAsBoolean(TCP_BLOCKING, false)));
this.port = settings.get("http.netty.port", settings.get("http.port", DEFAULT_PORT_RANGE));
this.bindHosts = settings.getAsArray("http.netty.bind_host", settings.getAsArray("http.bind_host", settings.getAsArray("http.host", null)));
this.publishHosts = settings.getAsArray("http.netty.publish_host", settings.getAsArray("http.publish_host", settings.getAsArray("http.host", null)));
this.tcpNoDelay = settings.get("http.netty.tcp_no_delay", settings.get(TCP_NO_DELAY, "true"));
this.tcpKeepAlive = settings.get("http.netty.tcp_keep_alive", settings.get(TCP_KEEP_ALIVE, "true"));
this.reuseAddress = settings.getAsBoolean("http.netty.reuse_address", settings.getAsBoolean(TCP_REUSE_ADDRESS, NetworkUtils.defaultReuseAddress()));
this.tcpSendBufferSize = settings.getAsBytesSize("http.netty.tcp_send_buffer_size", settings.getAsBytesSize(TCP_SEND_BUFFER_SIZE, TCP_DEFAULT_SEND_BUFFER_SIZE));
this.tcpReceiveBufferSize = settings.getAsBytesSize("http.netty.tcp_receive_buffer_size", settings.getAsBytesSize(TCP_RECEIVE_BUFFER_SIZE, TCP_DEFAULT_RECEIVE_BUFFER_SIZE));
this.detailedErrorsEnabled = settings.getAsBoolean(SETTING_HTTP_DETAILED_ERRORS_ENABLED, true);
long defaultReceiverPredictor = 512 * 1024;
if (JvmInfo.jvmInfo().getMem().getDirectMemoryMax().bytes() > 0) {
// we can guess a better default...
long l = (long) ((0.3 * JvmInfo.jvmInfo().getMem().getDirectMemoryMax().bytes()) / workerCount);
defaultReceiverPredictor = Math.min(defaultReceiverPredictor, Math.max(l, 64 * 1024));
}
// See AdaptiveReceiveBufferSizePredictor#DEFAULT_XXX for default values in netty..., we can use higher ones for us, even fixed one
ByteSizeValue receivePredictorMin = settings.getAsBytesSize("http.netty.receive_predictor_min", settings.getAsBytesSize("http.netty.receive_predictor_size", new ByteSizeValue(defaultReceiverPredictor)));
ByteSizeValue receivePredictorMax = settings.getAsBytesSize("http.netty.receive_predictor_max", settings.getAsBytesSize("http.netty.receive_predictor_size", new ByteSizeValue(defaultReceiverPredictor)));
if (receivePredictorMax.bytes() == receivePredictorMin.bytes()) {
receiveBufferSizePredictorFactory = new FixedReceiveBufferSizePredictorFactory((int) receivePredictorMax.bytes());
} else {
receiveBufferSizePredictorFactory = new AdaptiveReceiveBufferSizePredictorFactory((int) receivePredictorMin.bytes(), (int) receivePredictorMin.bytes(), (int) receivePredictorMax.bytes());
}
this.compression = settings.getAsBoolean(SETTING_HTTP_COMPRESSION, false);
this.compressionLevel = settings.getAsInt(SETTING_HTTP_COMPRESSION_LEVEL, 6);
this.pipelining = settings.getAsBoolean(SETTING_PIPELINING, DEFAULT_SETTING_PIPELINING);
this.pipeliningMaxEvents = settings.getAsInt(SETTING_PIPELINING_MAX_EVENTS, DEFAULT_SETTING_PIPELINING_MAX_EVENTS);
this.corsConfig = buildCorsConfig(settings);
// validate max content length
if (maxContentLength.bytes() > Integer.MAX_VALUE) {
logger.warn("maxContentLength[" + maxContentLength + "] set to high value, resetting it to [100mb]");
maxContentLength = new ByteSizeValue(100, ByteSizeUnit.MB);
}
this.maxContentLength = maxContentLength;
logger.debug("using max_chunk_size[{}], max_header_size[{}], max_initial_line_length[{}], max_content_length[{}], receive_predictor[{}->{}], pipelining[{}], pipelining_max_events[{}]",
maxChunkSize, maxHeaderSize, maxInitialLineLength, this.maxContentLength, receivePredictorMin, receivePredictorMax, pipelining, pipeliningMaxEvents);
}
public Settings settings() {
return this.settings;
}
@Override
public void httpServerAdapter(HttpServerAdapter httpServerAdapter) {
this.httpServerAdapter = httpServerAdapter;
}
@Override
protected void doStart() {
this.serverOpenChannels = new OpenChannelsHandler(logger);
if (blockingServer) {
serverBootstrap = new ServerBootstrap(new OioServerSocketChannelFactory(
Executors.newCachedThreadPool(daemonThreadFactory(settings, "http_server_boss")),
Executors.newCachedThreadPool(daemonThreadFactory(settings, "http_server_worker"))
));
} else {
serverBootstrap = new ServerBootstrap(new NioServerSocketChannelFactory(
Executors.newCachedThreadPool(daemonThreadFactory(settings, "http_server_boss")),
Executors.newCachedThreadPool(daemonThreadFactory(settings, "http_server_worker")),
workerCount));
}
serverBootstrap.setPipelineFactory(configureServerChannelPipelineFactory());
if (!"default".equals(tcpNoDelay)) {
serverBootstrap.setOption("child.tcpNoDelay", Booleans.parseBoolean(tcpNoDelay, null));
}
if (!"default".equals(tcpKeepAlive)) {
serverBootstrap.setOption("child.keepAlive", Booleans.parseBoolean(tcpKeepAlive, null));
}
if (tcpSendBufferSize != null && tcpSendBufferSize.bytes() > 0) {
serverBootstrap.setOption("child.sendBufferSize", tcpSendBufferSize.bytes());
}
if (tcpReceiveBufferSize != null && tcpReceiveBufferSize.bytes() > 0) {
serverBootstrap.setOption("child.receiveBufferSize", tcpReceiveBufferSize.bytes());
}
serverBootstrap.setOption("receiveBufferSizePredictorFactory", receiveBufferSizePredictorFactory);
serverBootstrap.setOption("child.receiveBufferSizePredictorFactory", receiveBufferSizePredictorFactory);
serverBootstrap.setOption("reuseAddress", reuseAddress);
serverBootstrap.setOption("child.reuseAddress", reuseAddress);
this.boundAddress = createBoundHttpAddress();
}
private BoundTransportAddress createBoundHttpAddress() {
// Bind and start to accept incoming connections.
InetAddress hostAddresses[];
try {
hostAddresses = networkService.resolveBindHostAddresses(bindHosts);
} catch (IOException e) {
throw new BindHttpException("Failed to resolve host [" + Arrays.toString(bindHosts) + "]", e);
}
List boundAddresses = new ArrayList<>(hostAddresses.length);
for (InetAddress address : hostAddresses) {
boundAddresses.add(bindAddress(address));
}
final InetAddress publishInetAddress;
try {
publishInetAddress = networkService.resolvePublishHostAddresses(publishHosts);
} catch (Exception e) {
throw new BindTransportException("Failed to resolve publish address", e);
}
final int publishPort = resolvePublishPort(settings, boundAddresses, publishInetAddress);
final InetSocketAddress publishAddress = new InetSocketAddress(publishInetAddress, publishPort);
return new BoundTransportAddress(boundAddresses.toArray(new TransportAddress[boundAddresses.size()]), new InetSocketTransportAddress(publishAddress));
}
// package private for tests
static int resolvePublishPort(Settings settings, List boundAddresses, InetAddress publishInetAddress) {
int publishPort = settings.getAsInt("http.netty.publish_port", settings.getAsInt("http.publish_port", -1));
if (publishPort < 0) {
for (InetSocketTransportAddress boundAddress : boundAddresses) {
InetAddress boundInetAddress = boundAddress.address().getAddress();
if (boundInetAddress.isAnyLocalAddress() || boundInetAddress.equals(publishInetAddress)) {
publishPort = boundAddress.getPort();
break;
}
}
}
// if no matching boundAddress found, check if there is a unique port for all bound addresses
if (publishPort < 0) {
final IntSet ports = new IntHashSet();
for (InetSocketTransportAddress boundAddress : boundAddresses) {
ports.add(boundAddress.getPort());
}
if (ports.size() == 1) {
publishPort = ports.iterator().next().value;
}
}
if (publishPort < 0) {
throw new BindHttpException("Failed to auto-resolve http publish port, multiple bound addresses " + boundAddresses +
" with distinct ports and none of them matched the publish address (" + publishInetAddress + "). " +
"Please specify a unique port by setting http.port or http.publish_port");
}
return publishPort;
}
private CorsConfig buildCorsConfig(Settings settings) {
if (settings.getAsBoolean(SETTING_CORS_ENABLED, false) == false) {
return CorsConfigBuilder.forOrigins().disable().build();
}
String origin = settings.get(SETTING_CORS_ALLOW_ORIGIN);
final CorsConfigBuilder builder;
if (Strings.isNullOrEmpty(origin)) {
builder = CorsConfigBuilder.forOrigins();
} else if (origin.equals(ANY_ORIGIN)) {
builder = CorsConfigBuilder.forAnyOrigin();
} else {
Pattern p = RestUtils.checkCorsSettingForRegex(origin);
if (p == null) {
builder = CorsConfigBuilder.forOrigins(RestUtils.corsSettingAsArray(origin));
} else {
builder = CorsConfigBuilder.forPattern(p);
}
}
if (settings.getAsBoolean(SETTING_CORS_ALLOW_CREDENTIALS, false)) {
builder.allowCredentials();
}
String[] strMethods = settings.getAsArray(SETTING_CORS_ALLOW_METHODS, DEFAULT_CORS_METHODS);
HttpMethod[] methods = new HttpMethod[strMethods.length];
for (int i = 0; i < methods.length; i++) {
methods[i] = HttpMethod.valueOf(strMethods[i]);
}
return builder.allowedRequestMethods(methods)
.maxAge(settings.getAsInt(SETTING_CORS_MAX_AGE, DEFAULT_CORS_MAX_AGE))
.allowedRequestHeaders(settings.getAsArray(SETTING_CORS_ALLOW_HEADERS, DEFAULT_CORS_HEADERS))
.shortCircuit()
.build();
}
private InetSocketTransportAddress bindAddress(final InetAddress hostAddress) {
PortsRange portsRange = new PortsRange(port);
final AtomicReference lastException = new AtomicReference<>();
final AtomicReference boundSocket = new AtomicReference<>();
boolean success = portsRange.iterate(new PortsRange.PortCallback() {
@Override
public boolean onPortNumber(int portNumber) {
try {
synchronized (serverChannels) {
Channel channel = serverBootstrap.bind(new InetSocketAddress(hostAddress, portNumber));
serverChannels.add(channel);
boundSocket.set((InetSocketAddress) channel.getLocalAddress());
}
} catch (Exception e) {
lastException.set(e);
return false;
}
return true;
}
});
if (!success) {
throw new BindHttpException("Failed to bind to [" + port + "]", lastException.get());
}
if (logger.isDebugEnabled()) {
logger.debug("Bound http to address {{}}", NetworkAddress.format(boundSocket.get()));
}
return new InetSocketTransportAddress(boundSocket.get());
}
@Override
protected void doStop() {
synchronized (serverChannels) {
if (serverChannels != null) {
for (Channel channel : serverChannels) {
channel.close().awaitUninterruptibly();
}
serverChannels = null;
}
}
if (serverOpenChannels != null) {
serverOpenChannels.close();
serverOpenChannels = null;
}
if (serverBootstrap != null) {
serverBootstrap.releaseExternalResources();
serverBootstrap = null;
}
}
@Override
protected void doClose() {
}
@Override
public BoundTransportAddress boundAddress() {
return this.boundAddress;
}
@Override
public HttpInfo info() {
BoundTransportAddress boundTransportAddress = boundAddress();
if (boundTransportAddress == null) {
return null;
}
return new HttpInfo(boundTransportAddress, maxContentLength.bytes());
}
@Override
public HttpStats stats() {
OpenChannelsHandler channels = serverOpenChannels;
return new HttpStats(channels == null ? 0 : channels.numberOfOpenChannels(), channels == null ? 0 : channels.totalChannels());
}
public CorsConfig getCorsConfig() {
return corsConfig;
}
protected void dispatchRequest(RestRequest request, RestChannel channel) {
httpServerAdapter.dispatchRequest(request, channel);
}
protected void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception {
if (e.getCause() instanceof ReadTimeoutException) {
if (logger.isTraceEnabled()) {
logger.trace("Connection timeout [{}]", ctx.getChannel().getRemoteAddress());
}
ctx.getChannel().close();
} else {
if (!lifecycle.started()) {
// ignore
return;
}
if (!NetworkExceptionHelper.isCloseConnectionException(e.getCause())) {
logger.warn("Caught exception while handling client http traffic, closing connection {}", e.getCause(), ctx.getChannel());
ctx.getChannel().close();
} else {
logger.debug("Caught exception while handling client http traffic, closing connection {}", e.getCause(), ctx.getChannel());
ctx.getChannel().close();
}
}
}
public ChannelPipelineFactory configureServerChannelPipelineFactory() {
return new HttpChannelPipelineFactory(this, detailedErrorsEnabled);
}
protected static class HttpChannelPipelineFactory implements ChannelPipelineFactory {
protected final NettyHttpServerTransport transport;
protected final HttpRequestHandler requestHandler;
public HttpChannelPipelineFactory(NettyHttpServerTransport transport, boolean detailedErrorsEnabled) {
this.transport = transport;
this.requestHandler = new HttpRequestHandler(transport, detailedErrorsEnabled);
}
@Override
public ChannelPipeline getPipeline() throws Exception {
ChannelPipeline pipeline = Channels.pipeline();
pipeline.addLast("openChannels", transport.serverOpenChannels);
HttpRequestDecoder requestDecoder = new HttpRequestDecoder(
(int) transport.maxInitialLineLength.bytes(),
(int) transport.maxHeaderSize.bytes(),
(int) transport.maxChunkSize.bytes()
);
if (transport.maxCumulationBufferCapacity != null) {
if (transport.maxCumulationBufferCapacity.bytes() > Integer.MAX_VALUE) {
requestDecoder.setMaxCumulationBufferCapacity(Integer.MAX_VALUE);
} else {
requestDecoder.setMaxCumulationBufferCapacity((int) transport.maxCumulationBufferCapacity.bytes());
}
}
if (transport.maxCompositeBufferComponents != -1) {
requestDecoder.setMaxCumulationBufferComponents(transport.maxCompositeBufferComponents);
}
pipeline.addLast("decoder", requestDecoder);
pipeline.addLast("decoder_compress", new ESHttpContentDecompressor(transport.compression));
HttpChunkAggregator httpChunkAggregator = new HttpChunkAggregator((int) transport.maxContentLength.bytes());
if (transport.maxCompositeBufferComponents != -1) {
httpChunkAggregator.setMaxCumulationBufferComponents(transport.maxCompositeBufferComponents);
}
pipeline.addLast("aggregator", httpChunkAggregator);
pipeline.addLast("encoder", new ESHttpResponseEncoder());
if (transport.compression) {
pipeline.addLast("encoder_compress", new HttpContentCompressor(transport.compressionLevel));
}
if (transport.settings().getAsBoolean(SETTING_CORS_ENABLED, false)) {
pipeline.addLast("cors", new CorsHandler(transport.getCorsConfig()));
}
if (transport.pipelining) {
pipeline.addLast("pipelining", new HttpPipeliningHandler(transport.pipeliningMaxEvents));
}
pipeline.addLast("handler", requestHandler);
return pipeline;
}
}
}