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Merge pull request #4787 from kwvanderlinde/bugfix/4542-immediate-ser…
…ver-start Further improvements to server starts
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138 changes: 138 additions & 0 deletions
138
clientserver/src/main/java/net/rptools/clientserver/simple/connection/DirectConnection.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| /* | ||
| * This software Copyright by the RPTools.net development team, and | ||
| * licensed under the Affero GPL Version 3 or, at your option, any later | ||
| * version. | ||
| * | ||
| * MapTool Source Code is distributed in the hope that it will be | ||
| * useful, but WITHOUT ANY WARRANTY; without even the implied warranty | ||
| * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | ||
| * | ||
| * You should have received a copy of the GNU Affero General Public | ||
| * License * along with this source Code. If not, please visit | ||
| * <http://www.gnu.org/licenses/> and specifically the Affero license | ||
| * text at <http://www.gnu.org/licenses/agpl.html>. | ||
| */ | ||
| package net.rptools.clientserver.simple.connection; | ||
|
|
||
| import java.util.concurrent.ArrayBlockingQueue; | ||
| import java.util.concurrent.BlockingQueue; | ||
| import java.util.concurrent.TimeUnit; | ||
| import java.util.concurrent.atomic.AtomicBoolean; | ||
| import org.apache.logging.log4j.LogManager; | ||
| import org.apache.logging.log4j.Logger; | ||
|
|
||
| public class DirectConnection extends AbstractConnection { | ||
| private static final Logger log = LogManager.getLogger(DirectConnection.class); | ||
|
|
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| public record Pair(DirectConnection clientSide, DirectConnection serverSide) {} | ||
|
|
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| public static Pair create(String id) { | ||
| var closed = new AtomicBoolean(false); | ||
| var clientToServerQueue = new ArrayBlockingQueue<byte[]>(128); | ||
| var serverToClientQueue = new ArrayBlockingQueue<byte[]>(128); | ||
|
|
||
| var clientSide = | ||
| new DirectConnection(closed, id + "-client", clientToServerQueue, serverToClientQueue); | ||
| var serverSide = | ||
| new DirectConnection(closed, id + "-server", serverToClientQueue, clientToServerQueue); | ||
|
|
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| return new Pair(clientSide, serverSide); | ||
| } | ||
|
|
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| private final AtomicBoolean sharedClosedFlag; | ||
| private final String id; | ||
| private final BlockingQueue<byte[]> writeQueue; | ||
| private final ReceiveThread receiveThread; | ||
|
|
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| private DirectConnection( | ||
| AtomicBoolean sharedClosedFlag, | ||
| String id, | ||
| BlockingQueue<byte[]> writeQueue, | ||
| BlockingQueue<byte[]> readQueue) { | ||
| this.sharedClosedFlag = sharedClosedFlag; | ||
| this.id = id; | ||
| this.writeQueue = writeQueue; | ||
| this.receiveThread = new ReceiveThread(readQueue); | ||
| } | ||
|
|
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| @Override | ||
| public void open() { | ||
| receiveThread.start(); | ||
| } | ||
|
|
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| @Override | ||
| protected void onClose() { | ||
| // Tell the other end about our closure. | ||
| sharedClosedFlag.set(true); | ||
| receiveThread.interrupt(); | ||
| } | ||
|
|
||
| @Override | ||
| public void sendMessage(Object channel, byte[] message) { | ||
| if (message.length == 0) { | ||
| return; | ||
| } | ||
|
|
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| boolean written = false; | ||
| while (!written) { | ||
| try { | ||
| // Set a timeout so we have a chance to escape in case we weren't notified properly. | ||
| written = writeQueue.offer(message, 10, TimeUnit.MILLISECONDS); | ||
| } catch (InterruptedException e) { | ||
| // Just try again. | ||
| } | ||
| } | ||
| } | ||
|
|
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| @Override | ||
| public boolean isAlive() { | ||
| return !sharedClosedFlag.get(); | ||
| } | ||
|
|
||
| @Override | ||
| public String getId() { | ||
| return id; | ||
| } | ||
|
|
||
| @Override | ||
| public String getError() { | ||
| return null; | ||
| } | ||
|
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| private final class ReceiveThread extends Thread { | ||
| private final BlockingQueue<byte[]> readQueue; | ||
|
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| public ReceiveThread(BlockingQueue<byte[]> readQueue) { | ||
| super("DirectConnection.ReceiveThread"); | ||
| this.readQueue = readQueue; | ||
| } | ||
|
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| @Override | ||
| public void run() { | ||
| try { | ||
| while (!DirectConnection.this.isClosed() && DirectConnection.this.isAlive()) { | ||
| try { | ||
| // Set a timeout so we have a chance to escape in case we weren't notified properly. | ||
| byte[] message; | ||
| try { | ||
| message = readQueue.poll(10, TimeUnit.MILLISECONDS); | ||
| } catch (InterruptedException e) { | ||
| // Just try again. | ||
| continue; | ||
| } | ||
|
|
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| if (message != null) { | ||
| DirectConnection.this.dispatchMessage(message); | ||
| } | ||
| } catch (Throwable t) { | ||
| // don't let anything kill this thread via exception | ||
| log.error("Unexpected error in receive thread", t); | ||
| } | ||
| } | ||
| } finally { | ||
| DirectConnection.this.close(); | ||
| fireDisconnect(); | ||
| } | ||
| } | ||
| } | ||
| } |
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