net.dv8tion.jda.api.utils.SessionControllerAdapter Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of JDA Show documentation
Show all versions of JDA Show documentation
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("The provided token is invalid!"));
}
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
}
}
}
}
}