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Java wrapper for the popular chat & VOIP service: Discord https://discord.com
/*
* Copyright 2015 Austin Keener, Michael Ritter, Florian Spieß, and the JDA contributors
*
* 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 net.dv8tion.jda.api.utils;
import com.neovisionaries.ws.client.OpeningHandshakeException;
import net.dv8tion.jda.api.JDA;
import net.dv8tion.jda.api.exceptions.InvalidTokenException;
import net.dv8tion.jda.api.requests.Request;
import net.dv8tion.jda.api.requests.Response;
import net.dv8tion.jda.api.requests.RestRateLimiter;
import net.dv8tion.jda.api.requests.Route;
import net.dv8tion.jda.api.utils.data.DataObject;
import net.dv8tion.jda.internal.requests.RestActionImpl;
import net.dv8tion.jda.internal.utils.JDALogger;
import org.slf4j.Logger;
import javax.annotation.Nonnull;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.TimeUnit;
/**
* Simple implementation of {@link SessionController} without supporting concurrency.
*
* @see ConcurrentSessionController
*/
public class SessionControllerAdapter implements SessionController
{
protected static final Logger log = JDALogger.getLog(SessionControllerAdapter.class);
protected final Object lock = new Object();
protected Queue connectQueue;
protected RestRateLimiter.GlobalRateLimit globalRatelimit;
protected Thread workerHandle;
protected long lastConnect = 0;
public SessionControllerAdapter()
{
connectQueue = new ConcurrentLinkedQueue<>();
globalRatelimit = RestRateLimiter.GlobalRateLimit.create();
}
@Override
public void appendSession(@Nonnull SessionConnectNode node)
{
removeSession(node);
connectQueue.add(node);
runWorker();
}
@Override
public void removeSession(@Nonnull SessionConnectNode node)
{
connectQueue.remove(node);
}
@Nonnull
@Override
public RestRateLimiter.GlobalRateLimit getRateLimitHandle()
{
return globalRatelimit;
}
@Nonnull
@Override
public ShardedGateway getShardedGateway(@Nonnull JDA api)
{
return new RestActionImpl(api, Route.Misc.GATEWAY_BOT.compile())
{
@Override
public void handleResponse(Response response, Request request)
{
if (response.isOk())
{
DataObject object = response.getObject();
String url = object.getString("url");
int shards = object.getInt("shards");
int concurrency = object.getObject("session_start_limit").getInt("max_concurrency", 1);
request.onSuccess(new ShardedGateway(url, shards, concurrency));
}
else if (response.code == 401)
{
api.shutdownNow();
request.onFailure(new InvalidTokenException());
}
else
{
request.onFailure(response);
}
}
}.priority().complete();
}
protected void runWorker()
{
synchronized (lock)
{
if (workerHandle == null)
{
workerHandle = new QueueWorker();
workerHandle.start();
}
}
}
protected class QueueWorker extends Thread
{
/** Delay (in milliseconds) to sleep between connecting sessions */
protected final long delay;
public QueueWorker()
{
this(IDENTIFY_DELAY);
}
/**
* Creates a QueueWorker
*
* @param delay
* delay (in seconds) to wait between starting sessions
*/
public QueueWorker(int delay)
{
this(TimeUnit.SECONDS.toMillis(delay));
}
/**
* Creates a QueueWorker
*
* @param delay
* delay (in milliseconds) to wait between starting sessions
*/
public QueueWorker(long delay)
{
super("SessionControllerAdapter-Worker");
this.delay = delay;
super.setUncaughtExceptionHandler(this::handleFailure);
}
protected void handleFailure(Thread thread, Throwable exception)
{
log.error("Worker has failed with throwable!", exception);
}
@Override
public void run()
{
try
{
if (this.delay > 0)
{
final long interval = System.currentTimeMillis() - lastConnect;
if (interval < this.delay)
Thread.sleep(this.delay - interval);
}
}
catch (InterruptedException ex)
{
log.error("Unable to backoff", ex);
}
processQueue();
synchronized (lock)
{
workerHandle = null;
if (!connectQueue.isEmpty())
runWorker();
}
}
protected void processQueue()
{
boolean isMultiple = connectQueue.size() > 1;
while (!connectQueue.isEmpty())
{
SessionConnectNode node = connectQueue.poll();
try
{
node.run(isMultiple && connectQueue.isEmpty());
isMultiple = true;
lastConnect = System.currentTimeMillis();
if (connectQueue.isEmpty())
break;
if (this.delay > 0)
Thread.sleep(this.delay);
}
catch (IllegalStateException e)
{
Throwable t = e.getCause();
if (t instanceof OpeningHandshakeException)
log.error("Failed opening handshake, appending to queue. Message: {}", e.getMessage());
else if (t != null && !JDA.Status.RECONNECT_QUEUED.name().equals(t.getMessage()))
log.error("Failed to establish connection for a node, appending to queue", e);
else
log.error("Unexpected exception when running connect node", e);
appendSession(node);
}
catch (InterruptedException e)
{
log.error("Failed to run node", e);
appendSession(node);
return; // caller should start a new thread
}
}
}
}
}