All Downloads are FREE. Search and download functionalities are using the official Maven repository.
Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance.
Project price only 1 $
You can buy this project and download/modify it how often you want.
io.vertx.core.eventbus.impl.HandlerRegistration Maven / Gradle / Ivy
package io.vertx.core.eventbus.impl;
import io.vertx.core.*;
import io.vertx.core.eventbus.Message;
import io.vertx.core.eventbus.MessageConsumer;
import io.vertx.core.eventbus.ReplyException;
import io.vertx.core.eventbus.ReplyFailure;
import io.vertx.core.eventbus.impl.clustered.ClusteredMessage;
import io.vertx.core.impl.Arguments;
import io.vertx.core.logging.Logger;
import io.vertx.core.logging.LoggerFactory;
import io.vertx.core.spi.metrics.EventBusMetrics;
import io.vertx.core.streams.ReadStream;
import java.util.ArrayDeque;
import java.util.Objects;
import java.util.Queue;
/*
* This class is optimised for performance when used on the same event loop it was created on.
* However it can be used safely from other threads.
*
* The internal state is protected using the synchronized keyword. If always used on the same event loop, then
* we benefit from biased locking which makes the overhead of synchronized near zero.
*/
public class HandlerRegistration implements MessageConsumer, Handler> {
private static final Logger log = LoggerFactory.getLogger(HandlerRegistration.class);
public static final int DEFAULT_MAX_BUFFERED_MESSAGES = 1000;
private final Vertx vertx;
private final EventBusMetrics metrics;
private final EventBusImpl eventBus;
private final String address;
private final String repliedAddress;
private final boolean localOnly;
private final Handler>> asyncResultHandler;
private long timeoutID = -1;
private boolean registered;
private Handler> handler;
private AsyncResult result;
private Handler> completionHandler;
private Handler endHandler;
private Handler> discardHandler;
private int maxBufferedMessages = DEFAULT_MAX_BUFFERED_MESSAGES;
private final Queue> pending = new ArrayDeque<>(8);
private boolean paused;
private Object metric;
public HandlerRegistration(Vertx vertx, EventBusMetrics metrics, EventBusImpl eventBus, String address,
String repliedAddress, boolean localOnly,
Handler>> asyncResultHandler, long timeout) {
this.vertx = vertx;
this.metrics = metrics;
this.eventBus = eventBus;
this.address = address;
this.repliedAddress = repliedAddress;
this.localOnly = localOnly;
this.asyncResultHandler = asyncResultHandler;
if (timeout != -1) {
timeoutID = vertx.setTimer(timeout, tid -> {
metrics.replyFailure(address, ReplyFailure.TIMEOUT);
sendAsyncResultFailure(ReplyFailure.TIMEOUT, "Timed out waiting for a reply");
});
}
}
@Override
public synchronized MessageConsumer setMaxBufferedMessages(int maxBufferedMessages) {
Arguments.require(maxBufferedMessages >= 0, "Max buffered messages cannot be negative");
while (pending.size() > maxBufferedMessages) {
pending.poll();
}
this.maxBufferedMessages = maxBufferedMessages;
return this;
}
@Override
public synchronized int getMaxBufferedMessages() {
return maxBufferedMessages;
}
@Override
public String address() {
return address;
}
@Override
public synchronized void completionHandler(Handler> completionHandler) {
Objects.requireNonNull(completionHandler);
if (result != null) {
AsyncResult value = result;
vertx.runOnContext(v -> completionHandler.handle(value));
} else {
this.completionHandler = completionHandler;
}
}
@Override
public synchronized void unregister() {
unregister(false);
}
@Override
public synchronized void unregister(Handler> completionHandler) {
Objects.requireNonNull(completionHandler);
doUnregister(completionHandler, false);
}
public void unregister(boolean callEndHandler) {
doUnregister(null, callEndHandler);
}
public void sendAsyncResultFailure(ReplyFailure failure, String msg) {
unregister();
asyncResultHandler.handle(Future.failedFuture(new ReplyException(failure, msg)));
}
private void doUnregister(Handler> completionHandler, boolean callEndHandler) {
if (timeoutID != -1) {
vertx.cancelTimer(timeoutID);
}
if (endHandler != null && callEndHandler) {
Handler theEndHandler = endHandler;
Handler> handler = completionHandler;
completionHandler = ar -> {
theEndHandler.handle(null);
if (handler != null) {
handler.handle(ar);
}
};
}
if (registered) {
registered = false;
eventBus.removeRegistration(address, this, completionHandler);
} else {
callCompletionHandlerAsync(completionHandler);
}
registered = false;
}
private void callCompletionHandlerAsync(Handler> completionHandler) {
if (completionHandler != null) {
vertx.runOnContext(v -> completionHandler.handle(Future.succeededFuture()));
}
}
public synchronized void setResult(AsyncResult result) {
this.result = result;
if (completionHandler != null) {
if (result.succeeded()) {
metric = metrics.handlerRegistered(address, repliedAddress);
}
Handler> callback = completionHandler;
vertx.runOnContext(v -> callback.handle(result));
} else if (result.failed()) {
log.error("Failed to propagate registration for handler " + handler + " and address " + address);
} else {
metric = metrics.handlerRegistered(address, repliedAddress);
}
}
@Override
public void handle(Message message) {
Handler> theHandler = null;
synchronized (this) {
if (paused) {
if (pending.size() < maxBufferedMessages) {
pending.add(message);
} else {
if (discardHandler != null) {
discardHandler.handle(message);
} else {
log.warn("Discarding message as more than " + maxBufferedMessages + " buffered in paused consumer");
}
}
} else {
checkNextTick();
if (metrics.isEnabled()) {
boolean local = true;
if (message instanceof ClusteredMessage) {
// A bit hacky
ClusteredMessage cmsg = (ClusteredMessage)message;
if (cmsg.isFromWire()) {
local = false;
}
}
metrics.beginHandleMessage(metric, local);
}
theHandler = handler;
}
}
// Handle the message outside the sync block
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=473714
if (theHandler != null) {
String creditsAddress = message.headers().get(MessageProducerImpl.CREDIT_ADDRESS_HEADER_NAME);
if (creditsAddress != null) {
eventBus.send(creditsAddress, 1);
}
handleMessage(theHandler, message);
}
}
private void handleMessage(Handler> theHandler, Message message) {
try {
theHandler.handle(message);
metrics.endHandleMessage(metric, null);
} catch (Exception e) {
log.error("Failed to handleMessage", e);
metrics.endHandleMessage(metric, e);
throw e;
}
}
/*
* Internal API for testing purposes.
*/
public synchronized void discardHandler(Handler> handler) {
this.discardHandler = handler;
}
@Override
public synchronized MessageConsumer handler(Handler> handler) {
this.handler = handler;
if (this.handler != null && !registered) {
registered = true;
eventBus.addRegistration(address, this, repliedAddress != null, localOnly);
} else if (this.handler == null && registered) {
// This will set registered to false
this.unregister();
}
return this;
}
@Override
public ReadStream bodyStream() {
return new BodyReadStream<>(this);
}
@Override
public synchronized boolean isRegistered() {
return registered;
}
@Override
public synchronized MessageConsumer pause() {
if (!paused) {
paused = true;
}
return this;
}
@Override
public synchronized MessageConsumer resume() {
if (paused) {
paused = false;
checkNextTick();
}
return this;
}
@Override
public synchronized MessageConsumer endHandler(Handler endHandler) {
if (endHandler != null) {
// We should use the HandlerHolder context to properly do this (needs small refactoring)
Context endCtx = vertx.getOrCreateContext();
this.endHandler = v1 -> endCtx.runOnContext(v2 -> endHandler.handle(null));
} else {
this.endHandler = null;
}
return this;
}
@Override
public synchronized MessageConsumer exceptionHandler(Handler handler) {
return this;
}
private void checkNextTick() {
// Check if there are more pending messages in the queue that can be processed next time around
if (!pending.isEmpty()) {
vertx.runOnContext(v -> {
if (!paused) {
Message message = pending.poll();
if (message != null) {
HandlerRegistration.this.handle(message);
}
}
});
}
}
public Handler> getHandler() {
return handler;
}
public Object getMetric() {
return metric;
}
}
