Performance tuning for TimeoutTask in DefaultFuture (#4129)

Performance tuning for TimeoutTask in DefaultFuture, manually merge #4085 and #4087

Author: chickenlj

dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/exchange/support/DefaultFuture.java

@@ -50,20 +50,19 @@ public class DefaultFuture extends CompletableFuture<Object> {
 
     private static final Map<Long, DefaultFuture> FUTURES = new ConcurrentHashMap<>();
 
-    private static final Map<Long, Timeout> PENDING_TASKS = new ConcurrentHashMap<>();
-
     public static final Timer TIME_OUT_TIMER = new HashedWheelTimer(
             new NamedThreadFactory("dubbo-future-timeout", true),
             30,
             TimeUnit.MILLISECONDS);
 
     // invoke id.
-    private final long id;
+    private final Long id;
     private final Channel channel;
     private final Request request;
     private final int timeout;
     private final long start = System.currentTimeMillis();
     private volatile long sent;
+    private Timeout timeoutCheckTask;
 
     private DefaultFuture(Channel channel, Request request, int timeout) {
         this.channel = channel;
@@ -79,9 +78,8 @@ private DefaultFuture(Channel channel, Request request, int timeout) {
      * check time out of the future
      */
     private static void timeoutCheck(DefaultFuture future) {
-        TimeoutCheckTask task = new TimeoutCheckTask(future);
-        Timeout t = TIME_OUT_TIMER.newTimeout(task, future.getTimeout(), TimeUnit.MILLISECONDS);
-        PENDING_TASKS.put(future.getId(), t);
+        TimeoutCheckTask task = new TimeoutCheckTask(future.getId());
+        future.timeoutCheckTask = TIME_OUT_TIMER.newTimeout(task, future.getTimeout(), TimeUnit.MILLISECONDS);
     }
 
     /**
@@ -140,15 +138,19 @@ public static void closeChannel(Channel channel) {
     }
 
     public static void received(Channel channel, Response response) {
+        received(channel, response, false);
+    }
+
+    public static void received(Channel channel, Response response, boolean timeout) {
         try {
             DefaultFuture future = FUTURES.remove(response.getId());
             if (future != null) {
-                future.doReceived(response);
-                Timeout t = PENDING_TASKS.remove(future.getId());
-                if (t != null) {
+                Timeout t = future.timeoutCheckTask;
+                if (!timeout) {
                     // decrease Time
                     t.cancel();
                 }
+                future.doReceived(response);
             } else {
                 logger.warn("The timeout response finally returned at "
                         + (new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS").format(new Date()))
@@ -229,14 +231,15 @@ private String getTimeoutMessage(boolean scan) {
 
     private static class TimeoutCheckTask implements TimerTask {
 
-        private DefaultFuture future;
+        private final Long requestID;
 
-        TimeoutCheckTask(DefaultFuture future) {
-            this.future = future;
+        TimeoutCheckTask(Long requestID) {
+            this.requestID = requestID;
         }
 
         @Override
         public void run(Timeout timeout) {
+            DefaultFuture future = DefaultFuture.getFuture(requestID);
             if (future == null || future.isDone()) {
                 return;
             }
@@ -246,7 +249,7 @@ public void run(Timeout timeout) {
             timeoutResponse.setStatus(future.isSent() ? Response.SERVER_TIMEOUT : Response.CLIENT_TIMEOUT);
             timeoutResponse.setErrorMessage(future.getTimeoutMessage(true));
             // handle response.
-            DefaultFuture.received(future.getChannel(), timeoutResponse);
+            DefaultFuture.received(future.getChannel(), timeoutResponse, true);
 
         }
     }