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.
package org.enodeframework.queue;
import io.vertx.core.AsyncResult;
import io.vertx.core.Handler;
import io.vertx.core.Vertx;
import io.vertx.core.VertxOptions;
import io.vertx.core.eventbus.EventBusOptions;
import io.vertx.core.json.JsonObject;
import io.vertx.core.net.NetClient;
import io.vertx.core.net.NetClientOptions;
import io.vertx.core.net.NetSocket;
import io.vertx.core.net.SocketAddress;
import io.vertx.core.net.impl.ConnectionBase;
import io.vertx.ext.eventbus.bridge.tcp.impl.protocol.FrameHelper;
import org.enodeframework.common.exception.ReplyAddressInvalidException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.net.URI;
import java.util.ArrayDeque;
import java.util.Queue;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
/**
* An event bus implementation that point to point with other Vert.x nodes
*/
public class PointToPointEventBus {
private static final Logger log = LoggerFactory.getLogger(PointToPointEventBus.class);
private final EventBusOptions options;
private final NetClient client;
private final Vertx vertx;
private final ConcurrentMap connections = new ConcurrentHashMap<>();
public PointToPointEventBus(Vertx vertx, VertxOptions options) {
this.vertx = vertx;
this.options = options.getEventBusOptions();
this.client = vertx.createNetClient(new NetClientOptions(this.options.toJson()));
}
NetClient client() {
return client;
}
public void send(String address, JsonObject message) {
OutboundDeliveryContext ctx = new OutboundDeliveryContext(message);
sendToNode(ctx, address);
}
public void close() {
if (client != null) {
client.close(serverClose -> {
if (serverClose.failed()) {
log.error("Failed to close server", serverClose.cause());
}
// Close all outbound connections explicitly - don't rely on context hooks
for (ConnectionHolder holder : connections.values()) {
holder.close();
}
});
}
}
private void sendToNode(OutboundDeliveryContext sendContext, String nodeId) {
sendRemote(sendContext, nodeId);
}
private void sendRemote(OutboundDeliveryContext sendContext, String remoteNodeId) {
// We need to deal with the fact that connecting can take some time and is async, and we cannot
// block to wait for it. So we add any sends to a pending list if not connected yet.
// Once we connect we send them.
// This can also be invoked concurrently from different threads, so it gets a little
// tricky
ConnectionHolder holder = connections.get(remoteNodeId);
if (holder == null) {
// When process is creating a lot of connections this can take some time
// so increase the timeout
holder = new ConnectionHolder(this, remoteNodeId);
ConnectionHolder prevHolder = connections.putIfAbsent(remoteNodeId, holder);
if (prevHolder != null) {
// Another one sneaked in
holder = prevHolder;
} else {
holder.connect();
}
}
holder.writeMessage(sendContext);
}
ConcurrentMap connections() {
return connections;
}
EventBusOptions options() {
return options;
}
Vertx vertx() {
return vertx;
}
}
class OutboundDeliveryContext implements Handler> {
public final JsonObject message;
public OutboundDeliveryContext(JsonObject message) {
this.message = message;
}
@Override
public void handle(AsyncResult event) {
}
public void written(Throwable cause) {
}
}
class ConnectionHolder {
private final Logger log = LoggerFactory.getLogger(ConnectionHolder.class);
private final PointToPointEventBus eventBus;
private final String remoteNodeAddress;
private Queue pending;
private NetSocket socket;
private boolean connected;
private long timeoutID = -1;
private long pingTimeoutID = -1;
public ConnectionHolder(PointToPointEventBus eventBus, String remoteNodeAddress) {
this.eventBus = eventBus;
this.remoteNodeAddress = remoteNodeAddress;
}
SocketAddress toURI(String value) {
try {
URI uri = new URI(value);
return SocketAddress.inetSocketAddress(uri.getPort(), uri.getHost());
} catch (Exception e) {
log.error("parse address error. uri: {}", value, e);
throw new ReplyAddressInvalidException(value, e);
}
}
void connect() {
SocketAddress socketAddress = toURI(remoteNodeAddress);
eventBus.client().connect(socketAddress)
.onComplete(ar -> {
if (ar.succeeded()) {
connected(ar.result());
} else {
log.warn("Connecting to server " + remoteNodeAddress + " failed", ar.cause());
close(ar.cause());
}
});
}
// TODO optimise this (contention on monitor)
synchronized void writeMessage(OutboundDeliveryContext ctx) {
if (connected) {
FrameHelper.sendFrame("send", remoteNodeAddress, ctx.message, socket);
} else {
if (pending == null) {
if (log.isDebugEnabled()) {
log.debug("Not connected to server " + remoteNodeAddress + " - starting queuing");
}
pending = new ArrayDeque<>();
}
pending.add(ctx);
}
}
void close() {
close(ConnectionBase.CLOSED_EXCEPTION);
}
private void close(Throwable cause) {
if (timeoutID != -1) {
eventBus.vertx().cancelTimer(timeoutID);
}
if (pingTimeoutID != -1) {
eventBus.vertx().cancelTimer(pingTimeoutID);
}
synchronized (this) {
OutboundDeliveryContext msg;
if (pending != null) {
while ((msg = pending.poll()) != null) {
msg.written(cause);
log.error("connection closed, queue msg: {}", msg, cause);
}
}
}
// The holder can be null or different if the target server is restarted with same nodeInfo
// before the cleanup for the previous one has been processed
if (eventBus.connections().remove(remoteNodeAddress, this)) {
if (log.isDebugEnabled()) {
log.debug("Point to point connection closed for server " + remoteNodeAddress);
}
}
}
private void schedulePing() {
EventBusOptions options = eventBus.options();
pingTimeoutID = eventBus.vertx().setTimer(options.getClusterPingInterval(), id1 -> {
// If we don't get a pong back in time we close the connection
timeoutID = eventBus.vertx().setTimer(options.getClusterPingReplyInterval(), id2 -> {
// Didn't get pong in time - consider connection dead
log.warn("No pong from server " + remoteNodeAddress + " - will consider it dead");
close();
});
FrameHelper.sendFrame("ping", remoteNodeAddress, new JsonObject(), socket);
});
}
private synchronized void connected(NetSocket socket) {
this.socket = socket;
connected = true;
socket.exceptionHandler(err -> {
close(err);
});
socket.closeHandler(v -> close());
socket.handler(data -> {
// Got a pong back
eventBus.vertx().cancelTimer(timeoutID);
schedulePing();
});
// Start a pinger
schedulePing();
if (pending != null) {
if (log.isDebugEnabled()) {
log.debug("Draining the queue for server " + remoteNodeAddress);
}
for (OutboundDeliveryContext ctx : pending) {
FrameHelper.sendFrame("send", remoteNodeAddress, ctx.message, socket);
}
}
pending = null;
}
}
