/*
* Copyright (C) 2012-2014 DataStax 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 com.datastax.driver.core;
import javax.net.ssl.SSLEngine;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.util.Iterator;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
import com.google.common.util.concurrent.AbstractFuture;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
import com.google.common.util.concurrent.Uninterruptibles;
import org.jboss.netty.bootstrap.ClientBootstrap;
import org.jboss.netty.channel.*;
import org.jboss.netty.channel.group.ChannelGroup;
import org.jboss.netty.channel.group.DefaultChannelGroup;
import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory;
import org.jboss.netty.handler.ssl.SslHandler;
import org.jboss.netty.util.HashedWheelTimer;
import org.jboss.netty.util.Timeout;
import org.jboss.netty.util.TimerTask;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.datastax.driver.core.exceptions.AuthenticationException;
import com.datastax.driver.core.exceptions.DriverInternalError;
// For LoggingHandler
//import org.jboss.netty.handler.logging.LoggingHandler;
//import org.jboss.netty.logging.InternalLogLevel;
/**
* A connection to a Cassandra Node.
*/
class Connection {
private static final Logger logger = LoggerFactory.getLogger(Connection.class);
private static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
public final InetSocketAddress address;
private final String name;
private final Channel channel;
private final Factory factory;
private final Dispatcher dispatcher = new Dispatcher();
// Used by connection pooling to count how many requests are "in flight" on that connection.
public final AtomicInteger inFlight = new AtomicInteger(0);
private final AtomicInteger writer = new AtomicInteger(0);
private volatile String keyspace;
private volatile boolean isInitialized;
private volatile boolean isDefunct;
private final AtomicReference<ConnectionCloseFuture> closeFuture = new AtomicReference<ConnectionCloseFuture>();
/**
* Create a new connection to a Cassandra node.
*
* The connection is open and initialized by the constructor.
*
* @throws ConnectionException if the connection attempts fails or is
* refused by the server.
*/
protected Connection(String name, InetSocketAddress address, Factory factory) throws ConnectionException, InterruptedException, UnsupportedProtocolVersionException {
this.address = address;
this.factory = factory;
this.name = name;
ClientBootstrap bootstrap = factory.newBootstrap();
ProtocolOptions protocolOptions = factory.configuration.getProtocolOptions();
int protocolVersion = factory.protocolVersion == 1 ? 1 : 2;
bootstrap.setPipelineFactory(new PipelineFactory(this, protocolVersion, protocolOptions.getCompression().compressor, protocolOptions.getSSLOptions()));
ChannelFuture future = bootstrap.connect(address);
writer.incrementAndGet();
try {
// Wait until the connection attempt succeeds or fails.
this.channel = future.awaitUninterruptibly().getChannel();
this.factory.allChannels.add(this.channel);
if (!future.isSuccess())
{
if (logger.isDebugEnabled())
logger.debug(String.format("[%s] Error connecting to %s%s", name, address, extractMessage(future.getCause())));
throw defunct(new TransportException(address, "Cannot connect", future.getCause()));
}
} finally {
writer.decrementAndGet();
}
logger.trace("[{}] Connection opened successfully", name);
initializeTransport(protocolVersion);
logger.debug("[{}] Transport initialized and ready", name);
isInitialized = true;
}
private static String extractMessage(Throwable t) {
if (t == null)
return "";
String msg = t.getMessage() == null || t.getMessage().isEmpty()
? t.toString()
: t.getMessage();
return " (" + msg + ')';
}
private void initializeTransport(int version) throws ConnectionException, InterruptedException, UnsupportedProtocolVersionException {
try {
ProtocolOptions.Compression compression = factory.configuration.getProtocolOptions().getCompression();
Message.Response response = write(new Requests.Startup(compression)).get();
switch (response.type) {
case READY:
break;
case ERROR:
Responses.Error error = (Responses.Error)response;
// Testing for a specific string is a tad fragile but well, we don't have much choice
if (error.code == ExceptionCode.PROTOCOL_ERROR && error.message.contains("Invalid or unsupported protocol version"))
throw unsupportedProtocolVersionException(version);
throw defunct(new TransportException(address, String.format("Error initializing connection: %s", error.message)));
case AUTHENTICATE:
Authenticator authenticator = factory.authProvider.newAuthenticator(address);
if (version == 1)
{
if (authenticator instanceof ProtocolV1Authenticator)
authenticateV1(authenticator);
else
// DSE 3.x always uses SASL authentication backported from protocol v2
authenticateV2(authenticator);
}
else
authenticateV2(authenticator);
break;
default:
throw defunct(new TransportException(address, String.format("Unexpected %s response message from server to a STARTUP message", response.type)));
}
} catch (BusyConnectionException e) {
throw defunct(new DriverInternalError("Newly created connection should not be busy"));
} catch (ExecutionException e) {
throw defunct(new ConnectionException(address, String.format("Unexpected error during transport initialization (%s)", e.getCause()), e.getCause()));
}
}
private UnsupportedProtocolVersionException unsupportedProtocolVersionException(int triedVersion) {
logger.debug("Got unsupported protocol version error from {} for version {}", address, triedVersion);
UnsupportedProtocolVersionException exc = new UnsupportedProtocolVersionException(address, triedVersion);
defunct(new TransportException(address, "Cannot initialize transport", exc));
return exc;
}
private void authenticateV1(Authenticator authenticator) throws ConnectionException, BusyConnectionException, ExecutionException, InterruptedException {
Requests.Credentials creds = new Requests.Credentials(((ProtocolV1Authenticator)authenticator).getCredentials());
Message.Response authResponse = write(creds).get();
switch (authResponse.type) {
case READY:
break;
case ERROR:
throw defunct(new AuthenticationException(address, ((Responses.Error)authResponse).message));
default:
throw defunct(new TransportException(address, String.format("Unexpected %s response message from server to a CREDENTIALS message", authResponse.type)));
}
}
private void authenticateV2(Authenticator authenticator) throws ConnectionException, BusyConnectionException, ExecutionException, InterruptedException {
byte[] initialResponse = authenticator.initialResponse();
if (null == initialResponse)
initialResponse = EMPTY_BYTE_ARRAY;
Message.Response authResponse = write(new Requests.AuthResponse(initialResponse)).get();
waitForAuthCompletion(authResponse, authenticator);
}
private void waitForAuthCompletion(Message.Response authResponse, Authenticator authenticator) throws ConnectionException, BusyConnectionException, ExecutionException, InterruptedException {
switch (authResponse.type) {
case AUTH_SUCCESS:
logger.trace("Authentication complete");
authenticator.onAuthenticationSuccess(((Responses.AuthSuccess)authResponse).token);
break;
case AUTH_CHALLENGE:
byte[] responseToServer = authenticator.evaluateChallenge(((Responses.AuthChallenge)authResponse).token);
if (responseToServer == null) {
// If we generate a null response, then authentication has completed, return without
// sending a further response back to the server.
logger.trace("Authentication complete (No response to server)");
return;
} else {
// Otherwise, send the challenge response back to the server
logger.trace("Sending Auth response to challenge");
waitForAuthCompletion(write(new Requests.AuthResponse(responseToServer)).get(), authenticator);
}
break;
case ERROR:
// This is not very nice, but we're trying to identify if we
// attempted v2 auth against a server which only supports v1
// The AIOOBE indicates that the server didn't recognise the
// initial AuthResponse message
String message = ((Responses.Error)authResponse).message;
if (message.startsWith("java.lang.ArrayIndexOutOfBoundsException: 15"))
message = String.format("Cannot use authenticator %s with protocol version 1, "
+ "only plain text authentication is supported with this protocol version", authenticator);
throw defunct(new AuthenticationException(address, message));
default:
throw defunct(new TransportException(address, String.format("Unexpected %s response message from server to authentication message", authResponse.type)));
}
}
public boolean isDefunct() {
return isDefunct;
}
public int maxAvailableStreams() {
return dispatcher.streamIdHandler.maxAvailableStreams();
}
<E extends Exception> E defunct(E e) {
if (logger.isDebugEnabled())
logger.debug("Defuncting connection to " + address, e);
isDefunct = true;
ConnectionException ce = e instanceof ConnectionException
? (ConnectionException)e
: new ConnectionException(address, "Connection problem", e);
// We need to signal the connection failure before erroring out handlers to make
// sure the "suspected" mechanism work as expected
Host host = factory.manager.metadata.getHost(address);
if (host != null) {
boolean isDown = factory.manager.signalConnectionFailure(host, ce, host.wasJustAdded(), isInitialized);
notifyOwnerWhenDefunct(isDown);
}
// Force the connection to close to make sure the future completes. Otherwise force() might never get called and
// threads will wait on the future forever.
// (this also errors out pending handlers)
closeAsync().force();
return e;
}
protected void notifyOwnerWhenDefunct(boolean hostIsDown) {
}
public String keyspace() {
return keyspace;
}
public void setKeyspace(String keyspace) throws ConnectionException {
if (keyspace == null)
return;
if (this.keyspace != null && this.keyspace.equals(keyspace))
return;
try {
logger.trace("[{}] Setting keyspace {}", name, keyspace);
long timeout = factory.getConnectTimeoutMillis();
// Note: we quote the keyspace below, because the name is the one coming from Cassandra, so it's in the right case already
Future future = write(new Requests.Query("USE \"" + keyspace + '"'));
Message.Response response = Uninterruptibles.getUninterruptibly(future, timeout, TimeUnit.MILLISECONDS);
switch (response.type) {
case RESULT:
this.keyspace = keyspace;
break;
default:
// The code set the keyspace only when a successful 'use'
// has been perform, so there shouldn't be any error here.
// It can happen however that the node we're connecting to
// is not up on the schema yet. In that case, defuncting
// the connection is not a bad choice.
defunct(new ConnectionException(address, String.format("Problem while setting keyspace, got %s as response", response)));
break;
}
} catch (ConnectionException e) {
throw defunct(e);
} catch (TimeoutException e) {
logger.warn(String.format("Timeout while setting keyspace on connection to %s. This should not happen but is not critical (it will retried)", address));
} catch (BusyConnectionException e) {
logger.warn(String.format("Tried to set the keyspace on busy connection to %s. This should not happen but is not critical (it will retried)", address));
} catch (ExecutionException e) {
throw defunct(new ConnectionException(address, "Error while setting keyspace", e));
}
}
/**
* Write a request on this connection.
*
* @param request the request to send
* @return a future on the server response
*
* @throws ConnectionException if the connection is closed
* @throws TransportException if an I/O error while sending the request
*/
public Future write(Message.Request request) throws ConnectionException, BusyConnectionException {
Future future = new Future(request);
write(future);
return future;
}
public ResponseHandler write(ResponseCallback callback) throws ConnectionException, BusyConnectionException {
Message.Request request = callback.request();
ResponseHandler handler = new ResponseHandler(this, callback);
dispatcher.add(handler);
request.setStreamId(handler.streamId);
/*
* We check for close/defunct *after* having set the handler because closing/defuncting
* will set their flag and then error out handler if need. So, by doing the check after
* having set the handler, we guarantee that even if we race with defunct/close, we may
* never leave a handler that won't get an answer or be errored out.
*/
if (isDefunct) {
dispatcher.removeHandler(handler.streamId, true);
throw new ConnectionException(address, "Write attempt on defunct connection");
}
if (isClosed()) {
dispatcher.removeHandler(handler.streamId, true);
throw new ConnectionException(address, "Connection has been closed");
}
logger.trace("[{}] writing request {}", name, request);
writer.incrementAndGet();
channel.write(request).addListener(writeHandler(request, handler));
return handler;
}
private ChannelFutureListener writeHandler(final Message.Request request, final ResponseHandler handler) {
return new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture writeFuture) {
writer.decrementAndGet();
if (!writeFuture.isSuccess()) {
logger.debug("[{}] Error writing request {}", name, request);
// Remove this handler from the dispatcher so it don't get notified of the error
// twice (we will fail that method already)
dispatcher.removeHandler(handler.streamId, true);
ConnectionException ce;
if (writeFuture.getCause() instanceof java.nio.channels.ClosedChannelException) {
ce = new TransportException(address, "Error writing: Closed channel");
} else {
ce = new TransportException(address, "Error writing", writeFuture.getCause());
}
handler.callback.onException(Connection.this, defunct(ce), System.nanoTime() - handler.startTime);
} else {
logger.trace("[{}] request sent successfully", name);
}
}
};
}
public boolean isClosed() {
return closeFuture.get() != null;
}
public CloseFuture closeAsync() {
ConnectionCloseFuture future = new ConnectionCloseFuture();
if (!closeFuture.compareAndSet(null, future)) {
// close had already been called, return the existing future
return closeFuture.get();
}
logger.debug("[{}] closing connection", name);
// New writes will be refused now that the future is setup.
// We must now wait on the last ongoing queries to return, which will in turn trigger
// the closing of the channel. However, if there no ongoing query, signal now.
if (dispatcher.pending.isEmpty())
future.force();
return future;
}
@Override
public String toString() {
return String.format("Connection[%s, inFlight=%d, closed=%b]", name, inFlight.get(), isClosed());
}
public static class Factory {
private final ExecutorService bossExecutor = Executors.newCachedThreadPool();
private final ExecutorService workerExecutor = Executors.newCachedThreadPool();
public final HashedWheelTimer timer = new HashedWheelTimer(new ThreadFactoryBuilder().setNameFormat("Timeouter-%d").build());
private final ChannelFactory channelFactory = new NioClientSocketChannelFactory(bossExecutor, workerExecutor);
private final ChannelGroup allChannels = new DefaultChannelGroup();
private final ConcurrentMap<Host, AtomicInteger> idGenerators = new ConcurrentHashMap<Host, AtomicInteger>();
public final DefaultResponseHandler defaultHandler;
final Cluster.Manager manager;
public final Configuration configuration;
public final AuthProvider authProvider;
private volatile boolean isShutdown;
volatile int protocolVersion;
Factory(Cluster.Manager manager, Configuration configuration) {
this.defaultHandler = manager;
this.manager = manager;
this.configuration = configuration;
this.authProvider = configuration.getProtocolOptions().getAuthProvider();
this.protocolVersion = configuration.getProtocolOptions().initialProtocolVersion;
}
public int getPort() {
return configuration.getProtocolOptions().getPort();
}
/**
* Opens a new connection to the node this factory points to.
*
* @return the newly created (and initialized) connection.
*
* @throws ConnectionException if connection attempt fails.
*/
public Connection open(Host host) throws ConnectionException, InterruptedException, UnsupportedProtocolVersionException {
InetSocketAddress address = host.getSocketAddress();
if (isShutdown)
throw new ConnectionException(address, "Connection factory is shut down");
String name = address.toString() + '-' + getIdGenerator(host).getAndIncrement();
return new Connection(name, address, this);
}
/**
* Same as open, but associate the created connection to the provided connection pool.
*/
public PooledConnection open(HostConnectionPool pool) throws ConnectionException, InterruptedException, UnsupportedProtocolVersionException {
InetSocketAddress address = pool.host.getSocketAddress();
if (isShutdown)
throw new ConnectionException(address, "Connection factory is shut down");
String name = address.toString() + '-' + getIdGenerator(pool.host).getAndIncrement();
return new PooledConnection(name, address, this, pool);
}
private AtomicInteger getIdGenerator(Host host) {
AtomicInteger g = idGenerators.get(host);
if (g == null) {
g = new AtomicInteger(1);
AtomicInteger old = idGenerators.putIfAbsent(host, g);
if (old != null)
g = old;
}
return g;
}
public long getConnectTimeoutMillis() {
return configuration.getSocketOptions().getConnectTimeoutMillis();
}
public long getReadTimeoutMillis() {
return configuration.getSocketOptions().getReadTimeoutMillis();
}
private ClientBootstrap newBootstrap() {
ClientBootstrap b = new ClientBootstrap(channelFactory);
SocketOptions options = configuration.getSocketOptions();
b.setOption("connectTimeoutMillis", options.getConnectTimeoutMillis());
Boolean keepAlive = options.getKeepAlive();
if (keepAlive != null)
b.setOption("keepAlive", keepAlive);
Boolean reuseAddress = options.getReuseAddress();
if (reuseAddress != null)
b.setOption("reuseAddress", reuseAddress);
Integer soLinger = options.getSoLinger();
if (soLinger != null)
b.setOption("soLinger", soLinger);
Boolean tcpNoDelay = options.getTcpNoDelay();
if (tcpNoDelay != null)
b.setOption("tcpNoDelay", tcpNoDelay);
Integer receiveBufferSize = options.getReceiveBufferSize();
if (receiveBufferSize != null)
b.setOption("receiveBufferSize", receiveBufferSize);
Integer sendBufferSize = options.getSendBufferSize();
if (sendBufferSize != null)
b.setOption("sendBufferSize", sendBufferSize);
return b;
}
public void shutdown() {
// Make sure we skip creating connection from now on.
isShutdown = true;
// All channels should be closed already, we call this just to be sure. And we know
// we're not on an I/O thread or anything, so just call await.
allChannels.close().awaitUninterruptibly();
// This will call shutdownNow on the boss and worker executor. Since this is called
// only once all connection have been individually closed, it's fine.
channelFactory.releaseExternalResources();
timer.stop();
}
}
private class Dispatcher extends SimpleChannelUpstreamHandler {
public final StreamIdGenerator streamIdHandler = new StreamIdGenerator();
private final ConcurrentMap<Integer, ResponseHandler> pending = new ConcurrentHashMap<Integer, ResponseHandler>();
public void add(ResponseHandler handler) {
ResponseHandler old = pending.put(handler.streamId, handler);
assert old == null;
}
public void removeHandler(int streamId, boolean releaseStreamId) {
// If we don't release the ID, mark first so that we can rely later on the fact that if
// we receive a response for an ID with no handler, it's that this ID has been marked.
if (!releaseStreamId)
streamIdHandler.mark(streamId);
ResponseHandler handler = pending.remove(streamId);
if (handler != null)
handler.cancelTimeout();
if (releaseStreamId)
streamIdHandler.release(streamId);
}
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) {
if (!(e.getMessage() instanceof Message.Response)) {
String msg = asDebugString(e.getMessage());
logger.error("[{}] Received unexpected message: {}", name, msg);
defunct(new TransportException(address, "Unexpected message received: " + msg));
} else {
Message.Response response = (Message.Response)e.getMessage();
int streamId = response.getStreamId();
logger.trace("[{}] received: {}", name, e.getMessage());
if (streamId < 0) {
factory.defaultHandler.handle(response);
return;
}
ResponseHandler handler = pending.remove(streamId);
streamIdHandler.release(streamId);
if (handler == null) {
/**
* During normal operation, we should not receive responses for which we don't have a handler. There is
* two cases however where this can happen:
* 1) The connection has been defuncted due to some internal error and we've raced between removing the
* handler and actually closing the connection; since the original error has been logged, we're fine
* ignoring this completely.
* 2) This request has timed out. In that case, we've already switched to another host (or errored out
* to the user). So log it for debugging purpose, but it's fine ignoring otherwise.
*/
streamIdHandler.unmark(streamId);
if (logger.isDebugEnabled())
logger.debug("[{}] Response received on stream {} but no handler set anymore (either the request has "
+ "timed out or it was closed due to another error). Received message is {}", name, streamId, asDebugString(response));
return;
}
handler.cancelTimeout();
handler.callback.onSet(Connection.this, response, System.nanoTime() - handler.startTime);
// If we happen to be closed and we're the last outstanding request, we need to signal the close future
// (note: this is racy as the signaling can be called more than once, but that's not a problem)
if (isClosed() && pending.isEmpty())
closeFuture.get().force();
}
}
// Make sure we don't print huge responses in debug/error logs.
private String asDebugString(Object obj) {
if (obj == null)
return "null";
String msg = obj.toString();
if (msg.length() < 500)
return msg;
return msg.substring(0, 500) + "... [message of size " + msg.length() + " truncated]";
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) {
if (logger.isDebugEnabled())
logger.debug(String.format("[%s] connection error", name), e.getCause());
// Ignore exception while writing, this will be handled by write() directly
if (writer.get() > 0)
return;
defunct(new TransportException(address, String.format("Unexpected exception triggered (%s)", e.getCause()), e.getCause()));
}
public void errorOutAllHandler(ConnectionException ce) {
Iterator<ResponseHandler> iter = pending.values().iterator();
while (iter.hasNext())
{
ResponseHandler handler = iter.next();
handler.callback.onException(Connection.this, ce, System.nanoTime() - handler.startTime);
iter.remove();
}
}
@Override
public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) {
// If we've closed the channel client side then we don't really want to defunct the connection, but
// if there is remaining thread waiting on us, we still want to wake them up
if (!isInitialized || isClosed()) {
errorOutAllHandler(new TransportException(address, "Channel has been closed"));
// we still want to force so that the future completes
Connection.this.closeAsync().force();
} else
defunct(new TransportException(address, "Channel has been closed"));
}
}
private class ConnectionCloseFuture extends CloseFuture {
@Override
public ConnectionCloseFuture force() {
// Note: we must not call releaseExternalResources on the bootstrap, because this shutdown the executors, which are shared
// This method can be thrown during Connection ctor, at which point channel is not yet set. This is ok.
if (channel == null) {
set(null);
return this;
}
// We're going to close this channel. If anyone is waiting on that connection, we should defunct it otherwise it'll wait
// forever. In general this won't happen since we get there only when all ongoing query are done, but this can happen
// if the shutdown is forced. This is a no-op if there is no handler set anymore.
dispatcher.errorOutAllHandler(new TransportException(address, "Connection has been closed"));
ChannelFuture future = channel.close();
future.addListener(new ChannelFutureListener() {
public void operationComplete(ChannelFuture future) {
if (future.getCause() != null)
ConnectionCloseFuture.this.setException(future.getCause());
else
ConnectionCloseFuture.this.set(null);
}
});
return this;
}
}
static class Future extends AbstractFuture<Message.Response> implements RequestHandler.Callback {
private final Message.Request request;
private volatile InetSocketAddress address;
public Future(Message.Request request) {
this.request = request;
}
@Override
public void register(RequestHandler handler) {
// noop, we don't care about the handler here so far
}
@Override
public Message.Request request() {
return request;
}
@Override
public void onSet(Connection connection, Message.Response response, ExecutionInfo info, Statement statement, long latency) {
onSet(connection, response, latency);
}
@Override
public void onSet(Connection connection, Message.Response response, long latency) {
this.address = connection.address;
super.set(response);
}
@Override
public void onException(Connection connection, Exception exception, long latency) {
// If all nodes are down, we will get a null connection here. This is fine, if we have
// an exception, consumers shouldn't assume the address is not null.
if (connection != null)
this.address = connection.address;
super.setException(exception);
}
@Override
public void onTimeout(Connection connection, long latency) {
assert connection != null; // We always timeout on a specific connection, so this shouldn't be null
this.address = connection.address;
super.setException(new ConnectionException(connection.address, "Operation timed out"));
}
public InetSocketAddress getAddress() {
return address;
}
}
interface ResponseCallback {
public Message.Request request();
public void onSet(Connection connection, Message.Response response, long latency);
public void onException(Connection connection, Exception exception, long latency);
public void onTimeout(Connection connection, long latency);
}
static class ResponseHandler {
public final Connection connection;
public final int streamId;
public final ResponseCallback callback;
private final Timeout timeout;
private final long startTime;
public ResponseHandler(Connection connection, ResponseCallback callback) throws BusyConnectionException {
this.connection = connection;
this.streamId = connection.dispatcher.streamIdHandler.next();
this.callback = callback;
long timeoutMs = connection.factory.getReadTimeoutMillis();
this.timeout = timeoutMs <= 0 ? null : connection.factory.timer.newTimeout(onTimeoutTask(), timeoutMs, TimeUnit.MILLISECONDS);
this.startTime = System.nanoTime();
}
void cancelTimeout() {
if (timeout != null)
timeout.cancel();
}
public void cancelHandler() {
// We haven't really received a response: we want to remove the handle because we gave up on that
// request and there is no point in holding the handler, but we don't release the streamId. If we
// were, a new request could reuse that ID but get the answer to the request we just gave up on instead
// of its own answer, and we would have no way to detect that.
connection.dispatcher.removeHandler(streamId, false);
if (connection instanceof PooledConnection)
((PooledConnection)connection).release();
}
private TimerTask onTimeoutTask() {
return new TimerTask() {
@Override
public void run(Timeout timeout) {
callback.onTimeout(connection, System.nanoTime() - startTime);
cancelHandler();
}
};
}
}
public interface DefaultResponseHandler {
public void handle(Message.Response response);
}
private static class PipelineFactory implements ChannelPipelineFactory {
// Stateless handlers
private static final Message.ProtocolDecoder messageDecoder = new Message.ProtocolDecoder();
private static final Message.ProtocolEncoder messageEncoderV1 = new Message.ProtocolEncoder(1);
private static final Message.ProtocolEncoder messageEncoderV2 = new Message.ProtocolEncoder(2);
private static final Frame.Encoder frameEncoder = new Frame.Encoder();
private final int protocolVersion;
private final Connection connection;
private final FrameCompressor compressor;
private final SSLOptions sslOptions;
public PipelineFactory(Connection connection, int protocolVersion, FrameCompressor compressor, SSLOptions sslOptions) {
this.connection = connection;
this.protocolVersion = protocolVersion;
this.compressor = compressor;
this.sslOptions = sslOptions;
}
@Override
public ChannelPipeline getPipeline() throws Exception {
ChannelPipeline pipeline = Channels.pipeline();
if (sslOptions != null) {
SSLEngine engine = sslOptions.context.createSSLEngine();
engine.setUseClientMode(true);
engine.setEnabledCipherSuites(sslOptions.cipherSuites);
SslHandler handler = new SslHandler(engine);
handler.setCloseOnSSLException(true);
pipeline.addLast("ssl", handler);
}
//pipeline.addLast("debug", new LoggingHandler(InternalLogLevel.INFO));
pipeline.addLast("frameDecoder", new Frame.Decoder());
pipeline.addLast("frameEncoder", frameEncoder);
if (compressor != null) {
pipeline.addLast("frameDecompressor", new Frame.Decompressor(compressor));
pipeline.addLast("frameCompressor", new Frame.Compressor(compressor));
}
pipeline.addLast("messageDecoder", messageDecoder);
pipeline.addLast("messageEncoder", protocolVersion == 1 ? messageEncoderV1 : messageEncoderV2);
pipeline.addLast("dispatcher", connection.dispatcher);
return pipeline;
}
}
}