Backport #229: Name netty threads with plugin id and their purpose (#230)

Co-authored-by: Mashhur <99575341+mashhurs@users.noreply.github.com>

Author: jsvd

CHANGELOG.md

@@ -1,3 +1,6 @@
+## 6.4.5
+  - Name netty threads with plugin id and their purpose [229](https://github.com/logstash-plugins/logstash-input-tcp/pull/229)
+
 ## 6.4.4
   - update netty to 4.1.115 [#227](https://github.com/logstash-plugins/logstash-input-tcp/pull/227)
 

lib/logstash/inputs/tcp.rb

@@ -181,7 +181,7 @@ def register
     validate_ssl_config!
 
     if server?
-      @loop = InputLoop.new(@host, @port, DecoderImpl.new(@codec, self), @tcp_keep_alive, java_ssl_context)
+      @loop = InputLoop.new(@id, @host, @port, DecoderImpl.new(@codec, self), @tcp_keep_alive, java_ssl_context)
     end
   end
 

logstash-input-tcp.gemspec

@@ -6,7 +6,7 @@ Gem::Specification.new do |s|
   s.description   = "This gem is a Logstash plugin required to be installed on top of the Logstash core pipeline using $LS_HOME/bin/logstash-plugin install gemname. This gem is not a stand-alone program"
   s.authors       = ["Elastic"]
   s.email         = 'info@elastic.co'
-  s.homepage      = "http://www.elastic.co/guide/en/logstash/current/index.html"
+  s.homepage      = "https://elastic.co/logstash"
   s.platform      = "java"
   s.require_paths = ["lib", "vendor/jar-dependencies"]
 

src/main/java/org/logstash/tcp/InputLoop.java

@@ -21,6 +21,8 @@
 import java.io.IOException;
 import java.net.InetSocketAddress;
 
+import static org.logstash.tcp.util.DaemonThreadFactory.daemonThreadFactory;
+
 /**
  * Plain TCP Server Implementation.
  */
@@ -66,13 +68,13 @@ public final class InputLoop implements Runnable, Closeable {
      * @param decoder {@link Decoder} provided by Jruby
      * @param keepAlive set to true to instruct the socket to issue TCP keep alive
      */
-    public InputLoop(final String host, final int port, final Decoder decoder, final boolean keepAlive,
+    public InputLoop(final String id, final String host, final int port, final Decoder decoder, final boolean keepAlive,
                      final SslContext sslContext) {
         this.sslContext = sslContext;
         this.host = host;
         this.port = port;
-        worker = new NioEventLoopGroup();
-        boss = new NioEventLoopGroup(1);
+        boss = new NioEventLoopGroup(1, daemonThreadFactory(id + "-bossGroup"));
+        worker = new NioEventLoopGroup(daemonThreadFactory(id + "-workGroup"));
         serverBootstrap = new ServerBootstrap().group(boss, worker)
             .channel(NioServerSocketChannel.class)
             .option(ChannelOption.SO_BACKLOG, 1024)
@@ -152,7 +154,7 @@ public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws E
         }
 
         /**
-         * Listeners that flushes the the JRuby supplied {@link Decoder} when the socket is closed.
+         * Listeners that flushes the JRuby supplied {@link Decoder} when the socket is closed.
          */
         private static final class FlushOnCloseListener implements GenericFutureListener<Future<Void>> {
 
@@ -199,7 +201,7 @@ private static final class DecoderAdapter extends ChannelInboundHandlerAdapter {
                 this.decoder = decoder;
             }
 
-            // 6.07 updated to pass in the full netty ChannelHandlerContext instead of the remoteaddress field
+            // 6.07 updated to pass in the full netty ChannelHandlerContext instead of the remote address field
             //      corresponding interface updated
             @Override
             public void channelRead(final ChannelHandlerContext ctx, final Object msg) {

src/main/java/org/logstash/tcp/util/DaemonThreadFactory.java

@@ -0,0 +1,30 @@
+package org.logstash.tcp.util;
+
+import java.util.concurrent.ThreadFactory;
+import java.util.concurrent.atomic.AtomicInteger;
+
+public class DaemonThreadFactory implements ThreadFactory {
+
+    final ThreadGroup group;
+    final AtomicInteger threadNumber = new AtomicInteger(1);
+    final String namePrefix;
+
+    DaemonThreadFactory(String namePrefix) {
+        this.namePrefix = namePrefix;
+        group = Thread.currentThread().getThreadGroup();
+    }
+
+    @Override
+    public Thread newThread(Runnable r) {
+        Thread t = new Thread(group, r,
+                namePrefix + "[T#" + threadNumber.getAndIncrement() + "]",
+                0);
+        t.setDaemon(true);
+        return t;
+    }
+
+    public static ThreadFactory daemonThreadFactory(String namePrefix) {
+        return new DaemonThreadFactory(namePrefix);
+    }
+
+}

version

@@ -1 +1 @@
-6.4.4
+6.4.5