/*
* 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.transport;
import com.google.common.collect.ImmutableMap;
import org.elasticsearch.action.admin.cluster.node.liveness.TransportLivenessAction;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.collect.MapBuilder;
import org.elasticsearch.common.component.AbstractLifecycleComponent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.logging.Loggers;
import org.elasticsearch.common.metrics.MeanMetric;
import org.elasticsearch.common.regex.Regex;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.BoundTransportAddress;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.common.util.concurrent.AbstractRunnable;
import org.elasticsearch.common.util.concurrent.ConcurrentCollections;
import org.elasticsearch.common.util.concurrent.ConcurrentMapLong;
import org.elasticsearch.common.util.concurrent.EsRejectedExecutionException;
import org.elasticsearch.common.util.concurrent.FutureUtils;
import org.elasticsearch.node.settings.NodeSettingsService;
import org.elasticsearch.tasks.TaskManager;
import org.elasticsearch.threadpool.ThreadPool;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.atomic.AtomicLong;
import static org.elasticsearch.common.settings.Settings.Builder.EMPTY_SETTINGS;
/**
*
*/
public class TransportService extends AbstractLifecycleComponent<TransportService> {
public static final String DIRECT_RESPONSE_PROFILE = ".direct";
private final CountDownLatch blockIncomingRequestsLatch = new CountDownLatch(1);
protected final Transport transport;
protected final ThreadPool threadPool;
protected final TaskManager taskManager;
volatile ImmutableMap<String, RequestHandlerRegistry> requestHandlers = ImmutableMap.of();
final Object requestHandlerMutex = new Object();
final ConcurrentMapLong<RequestHolder> clientHandlers = ConcurrentCollections.newConcurrentMapLongWithAggressiveConcurrency();
final AtomicLong requestIds = new AtomicLong();
final CopyOnWriteArrayList<TransportConnectionListener> connectionListeners = new CopyOnWriteArrayList<>();
// An LRU (don't really care about concurrency here) that holds the latest timed out requests so if they
// do show up, we can print more descriptive information about them
final Map<Long, TimeoutInfoHolder> timeoutInfoHandlers = Collections.synchronizedMap(new LinkedHashMap<Long, TimeoutInfoHolder>(100, .75F, true) {
@Override
protected boolean removeEldestEntry(Map.Entry eldest) {
return size() > 100;
}
});
private final TransportService.Adapter adapter;
// tracer log
public static final String SETTING_TRACE_LOG_INCLUDE = "transport.tracer.include";
public static final String SETTING_TRACE_LOG_EXCLUDE = "transport.tracer.exclude";
private final ESLogger tracerLog;
volatile String[] tracerLogInclude;
volatile String[] tracelLogExclude;
private final ApplySettings settingsListener = new ApplySettings();
/** if set will call requests sent to this id to shortcut and executed locally */
volatile DiscoveryNode localNode = null;
public TransportService(Transport transport, ThreadPool threadPool) {
this(EMPTY_SETTINGS, transport, threadPool);
}
@Inject
public TransportService(Settings settings, Transport transport, ThreadPool threadPool) {
super(settings);
this.transport = transport;
this.threadPool = threadPool;
this.tracerLogInclude = settings.getAsArray(SETTING_TRACE_LOG_INCLUDE, Strings.EMPTY_ARRAY, true);
this.tracelLogExclude = settings.getAsArray(SETTING_TRACE_LOG_EXCLUDE, new String[]{"internal:discovery/zen/fd*", TransportLivenessAction.NAME}, true);
tracerLog = Loggers.getLogger(logger, ".tracer");
adapter = createAdapter();
taskManager = createTaskManager();
}
/**
* makes the transport service aware of the local node. this allows it to optimize requests sent
* from the local node to it self and by pass the network stack/ serialization
*/
public void setLocalNode(DiscoveryNode localNode) {
this.localNode = localNode;
}
// for testing
DiscoveryNode getLocalNode() {
return localNode;
}
public TaskManager getTaskManager() {
return taskManager;
}
protected Adapter createAdapter() {
return new Adapter();
}
protected TaskManager createTaskManager() {
return new TaskManager(settings);
}
// These need to be optional as they don't exist in the context of a transport client
@Inject(optional = true)
public void setDynamicSettings(NodeSettingsService nodeSettingsService) {
nodeSettingsService.addListener(settingsListener);
}
class ApplySettings implements NodeSettingsService.Listener {
@Override
public void onRefreshSettings(Settings settings) {
String[] newTracerLogInclude = settings.getAsArray(SETTING_TRACE_LOG_INCLUDE, TransportService.this.tracerLogInclude, true);
String[] newTracerLogExclude = settings.getAsArray(SETTING_TRACE_LOG_EXCLUDE, TransportService.this.tracelLogExclude, true);
if (newTracerLogInclude == TransportService.this.tracerLogInclude && newTracerLogExclude == TransportService.this.tracelLogExclude) {
return;
}
if (Arrays.equals(newTracerLogInclude, TransportService.this.tracerLogInclude) &&
Arrays.equals(newTracerLogExclude, TransportService.this.tracelLogExclude)) {
return;
}
TransportService.this.tracerLogInclude = newTracerLogInclude;
TransportService.this.tracelLogExclude = newTracerLogExclude;
logger.info("tracer log updated to use include: {}, exclude: {}", newTracerLogInclude, newTracerLogExclude);
}
}
// used for testing
public void applySettings(Settings settings) {
settingsListener.onRefreshSettings(settings);
}
@Override
protected void doStart() {
adapter.rxMetric.clear();
adapter.txMetric.clear();
transport.transportServiceAdapter(adapter);
transport.start();
if (transport.boundAddress() != null && logger.isInfoEnabled()) {
logger.info("{}", transport.boundAddress());
for (Map.Entry<String, BoundTransportAddress> entry : transport.profileBoundAddresses().entrySet()) {
logger.info("profile [{}]: {}", entry.getKey(), entry.getValue());
}
}
}
@Override
protected void doStop() {
try {
transport.stop();
} finally {
// in case the transport is not connected to our local node (thus cleaned on node disconnect)
// make sure to clean any leftover on going handles
for (Map.Entry<Long, RequestHolder> entry : clientHandlers.entrySet()) {
final RequestHolder holderToNotify = clientHandlers.remove(entry.getKey());
if (holderToNotify != null) {
// callback that an exception happened, but on a different thread since we don't
// want handlers to worry about stack overflows
threadPool.generic().execute(new Runnable() {
@Override
public void run() {
holderToNotify.handler().handleException(new TransportException("transport stopped, action: " + holderToNotify.action()));
}
});
}
}
}
}
@Override
protected void doClose() {
transport.close();
}
/**
* start accepting incoming requests.
* when the transport layer starts up it will block any incoming requests until
* this method is called
*/
public void acceptIncomingRequests() {
blockIncomingRequestsLatch.countDown();
}
public boolean addressSupported(Class<? extends TransportAddress> address) {
return transport.addressSupported(address);
}
public TransportInfo info() {
BoundTransportAddress boundTransportAddress = boundAddress();
if (boundTransportAddress == null) {
return null;
}
return new TransportInfo(boundTransportAddress, transport.profileBoundAddresses());
}
public TransportStats stats() {
return new TransportStats(transport.serverOpen(), adapter.rxMetric.count(), adapter.rxMetric.sum(), adapter.txMetric.count(), adapter.txMetric.sum());
}
public BoundTransportAddress boundAddress() {
return transport.boundAddress();
}
public List<String> getLocalAddresses() {
return transport.getLocalAddresses();
}
public boolean nodeConnected(DiscoveryNode node) {
return node.equals(localNode) || transport.nodeConnected(node);
}
public void connectToNode(DiscoveryNode node) throws ConnectTransportException {
if (node.equals(localNode)) {
return;
}
transport.connectToNode(node);
}
public void connectToNodeLight(DiscoveryNode node) throws ConnectTransportException {
if (node.equals(localNode)) {
return;
}
transport.connectToNodeLight(node);
}
public void disconnectFromNode(DiscoveryNode node) {
if (node.equals(localNode)) {
return;
}
transport.disconnectFromNode(node);
}
public void addConnectionListener(TransportConnectionListener listener) {
connectionListeners.add(listener);
}
public void removeConnectionListener(TransportConnectionListener listener) {
connectionListeners.remove(listener);
}
public <T extends TransportResponse> TransportFuture<T> submitRequest(DiscoveryNode node, String action, TransportRequest request,
TransportResponseHandler<T> handler) throws TransportException {
return submitRequest(node, action, request, TransportRequestOptions.EMPTY, handler);
}
public <T extends TransportResponse> TransportFuture<T> submitRequest(DiscoveryNode node, String action, TransportRequest request,
TransportRequestOptions options, TransportResponseHandler<T> handler) throws TransportException {
PlainTransportFuture<T> futureHandler = new PlainTransportFuture<>(handler);
sendRequest(node, action, request, options, futureHandler);
return futureHandler;
}
public <T extends TransportResponse> void sendRequest(final DiscoveryNode node, final String action, final TransportRequest request,
final TransportResponseHandler<T> handler) {
sendRequest(node, action, request, TransportRequestOptions.EMPTY, handler);
}
public <T extends TransportResponse> void sendRequest(final DiscoveryNode node, final String action, final TransportRequest request,
final TransportRequestOptions options, TransportResponseHandler<T> handler) {
if (node == null) {
throw new IllegalStateException("can't send request to a null node");
}
final long requestId = newRequestId();
final TimeoutHandler timeoutHandler;
try {
if (options.timeout() == null) {
timeoutHandler = null;
} else {
timeoutHandler = new TimeoutHandler(requestId);
}
clientHandlers.put(requestId, new RequestHolder<>(handler, node, action, timeoutHandler));
if (lifecycle.stoppedOrClosed()) {
// if we are not started the exception handling will remove the RequestHolder again and calls the handler to notify the caller.
// it will only notify if the toStop code hasn't done the work yet.
throw new TransportException("TransportService is closed stopped can't send request");
}
if (timeoutHandler != null) {
assert options.timeout() != null;
timeoutHandler.future = threadPool.schedule(options.timeout(), ThreadPool.Names.GENERIC, timeoutHandler);
}
if (node.equals(localNode)) {
sendLocalRequest(requestId, action, request);
} else {
transport.sendRequest(node, requestId, action, request, options);
}
} catch (final Throwable e) {
// usually happen either because we failed to connect to the node
// or because we failed serializing the message
final RequestHolder holderToNotify = clientHandlers.remove(requestId);
// If holderToNotify == null then handler has already been taken care of.
if (holderToNotify != null) {
holderToNotify.cancelTimeout();
// callback that an exception happened, but on a different thread since we don't
// want handlers to worry about stack overflows
final SendRequestTransportException sendRequestException = new SendRequestTransportException(node, action, e);
threadPool.executor(ThreadPool.Names.GENERIC).execute(new AbstractRunnable() {
@Override
public void onRejection(Throwable t) {
// if we get rejected during node shutdown we don't wanna bubble it up
logger.debug("failed to notify response handler on rejection", t);
}
@Override
public void onFailure(Throwable t) {
logger.warn("failed to notify response handler on exception", t);
}
@Override
protected void doRun() throws Exception {
holderToNotify.handler().handleException(sendRequestException);
}
});
}
}
}
private void sendLocalRequest(long requestId, final String action, final TransportRequest request) {
final DirectResponseChannel channel = new DirectResponseChannel(logger, localNode, action, requestId, adapter, threadPool);
try {
final RequestHandlerRegistry reg = adapter.getRequestHandler(action);
if (reg == null) {
throw new ActionNotFoundTransportException("Action [" + action + "] not found");
}
final String executor = reg.getExecutor();
if (ThreadPool.Names.SAME.equals(executor)) {
//noinspection unchecked
reg.processMessageReceived(request, channel);
} else {
threadPool.executor(executor).execute(new AbstractRunnable() {
@Override
protected void doRun() throws Exception {
//noinspection unchecked
reg.processMessageReceived(request, channel);
}
@Override
public boolean isForceExecution() {
return reg.isForceExecution();
}
@Override
public void onFailure(Throwable e) {
try {
channel.sendResponse(e);
} catch (Throwable e1) {
logger.warn("failed to notify channel of error message for action [" + action + "]", e1);
logger.warn("actual exception", e);
}
}
});
}
} catch (Throwable e) {
try {
channel.sendResponse(e);
} catch (Throwable e1) {
logger.warn("failed to notify channel of error message for action [" + action + "]", e1);
logger.warn("actual exception", e1);
}
}
}
private boolean shouldTraceAction(String action) {
if (tracerLogInclude.length > 0) {
if (Regex.simpleMatch(tracerLogInclude, action) == false) {
return false;
}
}
if (tracelLogExclude.length > 0) {
return !Regex.simpleMatch(tracelLogExclude, action);
}
return true;
}
private long newRequestId() {
return requestIds.getAndIncrement();
}
public TransportAddress[] addressesFromString(String address, int perAddressLimit) throws Exception {
return transport.addressesFromString(address, perAddressLimit);
}
/**
* Registers a new request handler
*
* @param action The action the request handler is associated with
* @param request The request class that will be used to constrcut new instances for streaming
* @param executor The executor the request handling will be executed on
* @param handler The handler itself that implements the request handling
*/
public final <Request extends TransportRequest> void registerRequestHandler(String action, Class<Request> request, String executor, TransportRequestHandler<Request> handler) {
registerRequestHandler(action, request, executor, false, true, handler);
}
/**
* Registers a new request handler
*
* @param action The action the request handler is associated with
* @param requestFactory a callable to be used construct new instances for streaming
* @param executor The executor the request handling will be executed on
* @param handler The handler itself that implements the request handling
*/
public <Request extends TransportRequest> void registerRequestHandler(String action, Callable<Request> requestFactory, String executor, TransportRequestHandler<Request> handler) {
RequestHandlerRegistry<Request> reg = new RequestHandlerRegistry<>(action, requestFactory, taskManager, handler, executor, false, true);
registerRequestHandler(reg);
}
/**
* Registers a new request handler
*
* @param action The action the request handler is associated with
* @param requestFactory a callable to be used construct new instances for streaming
* @param executor The executor the request handling will be executed on
* @param forceExecution Force execution on the executor queue and never reject it
* @param canTripCircuitBreaker Check the request size and raise an exception in case the limit is breached.
* @param handler The handler itself that implements the request handling
*/
public <Request extends TransportRequest> void registerRequestHandler(String action, Callable<Request> requestFactory, String executor, boolean forceExecution, boolean canTripCircuitBreaker, TransportRequestHandler<Request> handler) {
RequestHandlerRegistry<Request> reg = new RequestHandlerRegistry<>(action, requestFactory, taskManager, handler, executor, forceExecution, canTripCircuitBreaker);
registerRequestHandler(reg);
}
/**
* Registers a new request handler
*
* @param action The action the request handler is associated with
* @param request The request class that will be used to constrcut new instances for streaming
* @param executor The executor the request handling will be executed on
* @param forceExecution Force execution on the executor queue and never reject it
* @param canTripCircuitBreaker Check the request size and raise an exception in case the limit is breached.
* @param handler The handler itself that implements the request handling
*/
public <Request extends TransportRequest> void registerRequestHandler(String action, Class<Request> request, String executor, boolean forceExecution, boolean canTripCircuitBreaker, TransportRequestHandler<Request> handler) {
RequestHandlerRegistry<Request> reg = new RequestHandlerRegistry<>(action, request, taskManager, handler, executor, forceExecution, canTripCircuitBreaker);
registerRequestHandler(reg);
}
protected <Request extends TransportRequest> void registerRequestHandler(RequestHandlerRegistry<Request> reg) {
synchronized (requestHandlerMutex) {
RequestHandlerRegistry replaced = requestHandlers.get(reg.getAction());
requestHandlers = MapBuilder.newMapBuilder(requestHandlers).put(reg.getAction(), reg).immutableMap();
if (replaced != null) {
logger.warn("registered two transport handlers for action {}, handlers: {}, {}", reg.getAction(), reg, replaced);
}
}
}
public void removeHandler(String action) {
synchronized (requestHandlerMutex) {
requestHandlers = MapBuilder.newMapBuilder(requestHandlers).remove(action).immutableMap();
}
}
protected RequestHandlerRegistry getRequestHandler(String action) {
return requestHandlers.get(action);
}
protected class Adapter implements TransportServiceAdapter {
final MeanMetric rxMetric = new MeanMetric();
final MeanMetric txMetric = new MeanMetric();
@Override
public void received(long size) {
rxMetric.inc(size);
}
@Override
public void sent(long size) {
txMetric.inc(size);
}
@Override
public void onRequestSent(DiscoveryNode node, long requestId, String action, TransportRequest request, TransportRequestOptions options) {
if (traceEnabled() && shouldTraceAction(action)) {
traceRequestSent(node, requestId, action, options);
}
}
protected boolean traceEnabled() {
return tracerLog.isTraceEnabled();
}
@Override
public void onResponseSent(long requestId, String action, TransportResponse response, TransportResponseOptions options) {
if (traceEnabled() && shouldTraceAction(action)) {
traceResponseSent(requestId, action);
}
}
@Override
public void onResponseSent(long requestId, String action, Throwable t) {
if (traceEnabled() && shouldTraceAction(action)) {
traceResponseSent(requestId, action, t);
}
}
protected void traceResponseSent(long requestId, String action, Throwable t) {
tracerLog.trace("[{}][{}] sent error response (error: [{}])", requestId, action, t.getMessage());
}
@Override
public void onRequestReceived(long requestId, String action) {
try {
blockIncomingRequestsLatch.await();
} catch (InterruptedException e) {
logger.trace("interrupted while waiting for incoming requests block to be removed");
}
if (traceEnabled() && shouldTraceAction(action)) {
traceReceivedRequest(requestId, action);
}
}
@Override
public RequestHandlerRegistry getRequestHandler(String action) {
return requestHandlers.get(action);
}
@Override
public TransportResponseHandler onResponseReceived(final long requestId) {
RequestHolder holder = clientHandlers.remove(requestId);
if (holder == null) {
checkForTimeout(requestId);
return null;
}
holder.cancelTimeout();
if (traceEnabled() && shouldTraceAction(holder.action())) {
traceReceivedResponse(requestId, holder.node(), holder.action());
}
return holder.handler();
}
protected void checkForTimeout(long requestId) {
// lets see if its in the timeout holder, but sync on mutex to make sure any ongoing timeout handling has finished
final DiscoveryNode sourceNode;
final String action;
assert clientHandlers.get(requestId) == null;
TimeoutInfoHolder timeoutInfoHolder = timeoutInfoHandlers.remove(requestId);
if (timeoutInfoHolder != null) {
long time = System.currentTimeMillis();
logger.warn("Received response for a request that has timed out, sent [{}ms] ago, timed out [{}ms] ago, action [{}], node [{}], id [{}]", time - timeoutInfoHolder.sentTime(), time - timeoutInfoHolder.timeoutTime(), timeoutInfoHolder.action(), timeoutInfoHolder.node(), requestId);
action = timeoutInfoHolder.action();
sourceNode = timeoutInfoHolder.node();
} else {
logger.warn("Transport response handler not found of id [{}]", requestId);
action = null;
sourceNode = null;
}
// call tracer out of lock
if (traceEnabled() == false) {
return;
}
if (action == null) {
assert sourceNode == null;
traceUnresolvedResponse(requestId);
} else if (shouldTraceAction(action)) {
traceReceivedResponse(requestId, sourceNode, action);
}
}
@Override
public void raiseNodeConnected(final DiscoveryNode node) {
threadPool.generic().execute(new Runnable() {
@Override
public void run() {
for (TransportConnectionListener connectionListener : connectionListeners) {
connectionListener.onNodeConnected(node);
}
}
});
}
@Override
public void raiseNodeDisconnected(final DiscoveryNode node) {
try {
for (final TransportConnectionListener connectionListener : connectionListeners) {
threadPool.generic().execute(new Runnable() {
@Override
public void run() {
connectionListener.onNodeDisconnected(node);
}
});
}
for (Map.Entry<Long, RequestHolder> entry : clientHandlers.entrySet()) {
RequestHolder holder = entry.getValue();
if (holder.node().equals(node)) {
final RequestHolder holderToNotify = clientHandlers.remove(entry.getKey());
if (holderToNotify != null) {
// callback that an exception happened, but on a different thread since we don't
// want handlers to worry about stack overflows
threadPool.generic().execute(new Runnable() {
@Override
public void run() {
holderToNotify.handler().handleException(new NodeDisconnectedException(node, holderToNotify.action()));
}
});
}
}
}
} catch (EsRejectedExecutionException ex) {
logger.debug("Rejected execution on NodeDisconnected", ex);
}
}
protected void traceReceivedRequest(long requestId, String action) {
tracerLog.trace("[{}][{}] received request", requestId, action);
}
protected void traceResponseSent(long requestId, String action) {
tracerLog.trace("[{}][{}] sent response", requestId, action);
}
protected void traceReceivedResponse(long requestId, DiscoveryNode sourceNode, String action) {
tracerLog.trace("[{}][{}] received response from [{}]", requestId, action, sourceNode);
}
protected void traceUnresolvedResponse(long requestId) {
tracerLog.trace("[{}] received response but can't resolve it to a request", requestId);
}
protected void traceRequestSent(DiscoveryNode node, long requestId, String action, TransportRequestOptions options) {
tracerLog.trace("[{}][{}] sent to [{}] (timeout: [{}])", requestId, action, node, options.timeout());
}
}
class TimeoutHandler implements Runnable {
private final long requestId;
private final long sentTime = System.currentTimeMillis();
volatile ScheduledFuture future;
TimeoutHandler(long requestId) {
this.requestId = requestId;
}
@Override
public void run() {
// we get first to make sure we only add the TimeoutInfoHandler if needed.
final RequestHolder holder = clientHandlers.get(requestId);
if (holder != null) {
// add it to the timeout information holder, in case we are going to get a response later
long timeoutTime = System.currentTimeMillis();
timeoutInfoHandlers.put(requestId, new TimeoutInfoHolder(holder.node(), holder.action(), sentTime, timeoutTime));
// now that we have the information visible via timeoutInfoHandlers, we try to remove the request id
final RequestHolder removedHolder = clientHandlers.remove(requestId);
if (removedHolder != null) {
assert removedHolder == holder : "two different holder instances for request [" + requestId + "]";
removedHolder.handler().handleException(new ReceiveTimeoutTransportException(holder.node(), holder.action(), "request_id [" + requestId + "] timed out after [" + (timeoutTime - sentTime) + "ms]"));
} else {
// response was processed, remove timeout info.
timeoutInfoHandlers.remove(requestId);
}
}
}
/**
* cancels timeout handling. this is a best effort only to avoid running it. remove the requestId from {@link #clientHandlers}
* to make sure this doesn't run.
*/
public void cancel() {
assert clientHandlers.get(requestId) == null : "cancel must be called after the requestId [" + requestId + "] has been removed from clientHandlers";
FutureUtils.cancel(future);
}
}
static class TimeoutInfoHolder {
private final DiscoveryNode node;
private final String action;
private final long sentTime;
private final long timeoutTime;
TimeoutInfoHolder(DiscoveryNode node, String action, long sentTime, long timeoutTime) {
this.node = node;
this.action = action;
this.sentTime = sentTime;
this.timeoutTime = timeoutTime;
}
public DiscoveryNode node() {
return node;
}
public String action() {
return action;
}
public long sentTime() {
return sentTime;
}
public long timeoutTime() {
return timeoutTime;
}
}
static class RequestHolder<T extends TransportResponse> {
private final TransportResponseHandler<T> handler;
private final DiscoveryNode node;
private final String action;
private final TimeoutHandler timeoutHandler;
RequestHolder(TransportResponseHandler<T> handler, DiscoveryNode node, String action, TimeoutHandler timeoutHandler) {
this.handler = handler;
this.node = node;
this.action = action;
this.timeoutHandler = timeoutHandler;
}
public TransportResponseHandler<T> handler() {
return handler;
}
public DiscoveryNode node() {
return this.node;
}
public String action() {
return this.action;
}
public void cancelTimeout() {
if (timeoutHandler != null) {
timeoutHandler.cancel();
}
}
}
static class DirectResponseChannel implements TransportChannel {
final ESLogger logger;
final DiscoveryNode localNode;
final private String action;
final private long requestId;
final TransportServiceAdapter adapter;
final ThreadPool threadPool;
public DirectResponseChannel(ESLogger logger, DiscoveryNode localNode, String action, long requestId, TransportServiceAdapter adapter, ThreadPool threadPool) {
this.logger = logger;
this.localNode = localNode;
this.action = action;
this.requestId = requestId;
this.adapter = adapter;
this.threadPool = threadPool;
}
@Override
public String action() {
return action;
}
@Override
public String getProfileName() {
return DIRECT_RESPONSE_PROFILE;
}
@Override
public void sendResponse(TransportResponse response) throws IOException {
sendResponse(response, TransportResponseOptions.EMPTY);
}
@Override
public void sendResponse(final TransportResponse response, TransportResponseOptions options) throws IOException {
final TransportResponseHandler handler = adapter.onResponseReceived(requestId);
// ignore if its null, the adapter logs it
if (handler != null) {
final String executor = handler.executor();
if (ThreadPool.Names.SAME.equals(executor)) {
processResponse(handler, response);
} else {
threadPool.executor(executor).execute(new Runnable() {
@SuppressWarnings({"unchecked"})
@Override
public void run() {
processResponse(handler, response);
}
});
}
}
}
@SuppressWarnings("unchecked")
protected void processResponse(TransportResponseHandler handler, TransportResponse response) {
try {
handler.handleResponse(response);
} catch (Throwable e) {
processException(handler, wrapInRemote(new ResponseHandlerFailureTransportException(e)));
}
}
@Override
public void sendResponse(Throwable error) throws IOException {
final TransportResponseHandler handler = adapter.onResponseReceived(requestId);
// ignore if its null, the adapter logs it
if (handler != null) {
final RemoteTransportException rtx = wrapInRemote(error);
final String executor = handler.executor();
if (ThreadPool.Names.SAME.equals(executor)) {
processException(handler, rtx);
} else {
threadPool.executor(handler.executor()).execute(new Runnable() {
@SuppressWarnings({"unchecked"})
@Override
public void run() {
processException(handler, rtx);
}
});
}
}
}
protected RemoteTransportException wrapInRemote(Throwable t) {
if (t instanceof RemoteTransportException) {
return (RemoteTransportException) t;
}
return new RemoteTransportException(localNode.name(), localNode.getAddress(), action, t);
}
protected void processException(final TransportResponseHandler handler, final RemoteTransportException rtx) {
try {
handler.handleException(rtx);
} catch (Throwable e) {
logger.error("failed to handle exception for action [{}], handler [{}]", e, action, handler);
}
}
@Override
public long getRequestId() {
return requestId;
}
@Override
public String getChannelType() {
return "direct";
}
}
}