{"action":"created","comment":{"url":"https://api.github.com/repos/grpc/grpc-java/pulls/comments/78112392","id":78112392,"diff_hunk":"@@ -201,25 +200,42 @@ public void onStreamRemoved(Http2Stream stream) {\n   @Override\n   public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise)\n           throws Exception {\n-    if (msg instanceof CreateStreamCommand) {\n-      createStream((CreateStreamCommand) msg, promise);\n-    } else if (msg instanceof SendGrpcFrameCommand) {\n-      sendGrpcFrame(ctx, (SendGrpcFrameCommand) msg, promise);\n-    } else if (msg instanceof CancelClientStreamCommand) {\n-      cancelStream(ctx, (CancelClientStreamCommand) msg, promise);\n-    } else if (msg instanceof RequestMessagesCommand) {\n-      ((RequestMessagesCommand) msg).requestMessages();\n-    } else if (msg instanceof SendPingCommand) {\n-      sendPingFrame(ctx, (SendPingCommand) msg, promise);\n-    } else if (msg instanceof GracefulCloseCommand) {\n-      gracefulClose(ctx, (GracefulCloseCommand) msg, promise);\n-    } else if (msg instanceof ForcefulCloseCommand) {\n-      forcefulClose(ctx, (ForcefulCloseCommand) msg, promise);\n-    } else if (msg == NOOP_MESSAGE) {\n-      ctx.write(Unpooled.EMPTY_BUFFER, promise);\n-    } else {\n-      throw new AssertionError(\"Write called for unexpected type: \" + msg.getClass().getName());\n+    UnionCommand cmd = (UnionCommand) msg;\n+    switch (cmd.type()) {\n+      case CANCEL_CLIENT_STREAM:\n+        cancelStream(ctx, cmd, promise);\n+        return;\n+      case CANCEL_SERVER_STREAM:","path":"netty/src/main/java/io/grpc/netty/NettyClientHandler.java","position":70,"original_position":70,"commit_id":"3e9b3a99f845804f55b8249f556bd6860759dfe4","original_commit_id":"3e9b3a99f845804f55b8249f556bd6860759dfe4","user":{"login":"ejona86","id":2811396,"avatar_url":"https://avatars.githubusercontent.com/u/2811396?v=3","gravatar_id":"","url":"https://api.github.com/users/ejona86","html_url":"https://github.com/ejona86","followers_url":"https://api.github.com/users/ejona86/followers","following_url":"https://api.github.com/users/ejona86/following{/other_user}","gists_url":"https://api.github.com/users/ejona86/gists{/gist_id}","starred_url":"https://api.github.com/users/ejona86/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ejona86/subscriptions","organizations_url":"https://api.github.com/users/ejona86/orgs","repos_url":"https://api.github.com/users/ejona86/repos","events_url":"https://api.github.com/users/ejona86/events{/privacy}","received_events_url":"https://api.github.com/users/ejona86/received_events","type":"User","site_admin":false},"body":"Yeah... I'd be a fan of just have the default case throw and elide the unused cases. We're getting compiler support for noticing if a case is missing, so I also don't see the point.","created_at":"2016-09-09T00:22:55Z","updated_at":"2016-09-09T00:22:55Z","html_url":"https://github.com/grpc/grpc-java/pull/2240#discussion_r78112392","pull_request_url":"https://api.github.com/repos/grpc/grpc-java/pulls/2240","_links":{"self":{"href":"https://api.github.com/repos/grpc/grpc-java/pulls/comments/78112392"},"html":{"href":"https://github.com/grpc/grpc-java/pull/2240#discussion_r78112392"},"pull_request":{"href":"https://api.github.com/repos/grpc/grpc-java/pulls/2240"}}},"pull_request":{"url":"https://api.github.com/repos/grpc/grpc-java/pulls/2240","id":84420648,"html_url":"https://github.com/grpc/grpc-java/pull/2240","diff_url":"https://github.com/grpc/grpc-java/pull/2240.diff","patch_url":"https://github.com/grpc/grpc-java/pull/2240.patch","issue_url":"https://api.github.com/repos/grpc/grpc-java/issues/2240","number":2240,"state":"open","locked":false,"title":"netty: Recycle command objects on the WriteQueue","user":{"login":"carl-mastrangelo","id":8943572,"avatar_url":"https://avatars.githubusercontent.com/u/8943572?v=3","gravatar_id":"","url":"https://api.github.com/users/carl-mastrangelo","html_url":"https://github.com/carl-mastrangelo","followers_url":"https://api.github.com/users/carl-mastrangelo/followers","following_url":"https://api.github.com/users/carl-mastrangelo/following{/other_user}","gists_url":"https://api.github.com/users/carl-mastrangelo/gists{/gist_id}","starred_url":"https://api.github.com/users/carl-mastrangelo/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/carl-mastrangelo/subscriptions","organizations_url":"https://api.github.com/users/carl-mastrangelo/orgs","repos_url":"https://api.github.com/users/carl-mastrangelo/repos","events_url":"https://api.github.com/users/carl-mastrangelo/events{/privacy}","received_events_url":"https://api.github.com/users/carl-mastrangelo/received_events","type":"User","site_admin":false},"body":"WriteQueue may not be long for this world, but we have to live with it while it is here.\r\n\r\nThis change makes it so that QueueCommand objects are recycled from a pool of \"UnionCommand\" objects, which represent all possible commands.  They all share a single small set of variables.  Each command is actually a tagging interface with the appropriate getters.  \r\n\r\nBecause each of these objects was destined to be sent across a thread, there is basically no chance they could be stack or TLAB allocated.  I suspect the objects will flow from the application thread to the network thread, and hope that Recycler steals chunks of them back over as needed.  \r\n\r\nI don't expect this to have a dramatic impact, but it should reduce some of the noise in the allocation profiler.  By my count it saves about 2% of object allocation.\r\n\r\nSome nice things about this:\r\n\r\n- The if-else chain in the Handlers is gone!  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The hierarchy is now uniform\r\n\r\ncc: @louiscryan ","created_at":"2016-09-08T06:20:45Z","updated_at":"2016-09-09T00:22:55Z","closed_at":null,"merged_at":null,"merge_commit_sha":"fdc1364780d76dae339f2acf04f3de0b5b293c38","assignee":{"login":"buchgr","id":1388179,"avatar_url":"https://avatars.githubusercontent.com/u/1388179?v=3","gravatar_id":"","url":"https://api.github.com/users/buchgr","html_url":"https://github.com/buchgr","followers_url":"https://api.github.com/users/buchgr/followers","following_url":"https://api.github.com/users/buchgr/following{/other_user}","gists_url":"https://api.github.com/users/buchgr/gists{/gist_id}","starred_url":"https://api.github.com/users/buchgr/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/buchgr/subscriptions","organizations_url":"https://api.github.com/users/buchgr/orgs","repos_url":"https://api.github.com/users/buchgr/repos","events_url":"https://api.github.com/users/buchgr/events{/privacy}","received_events_url":"https://api.github.com/users/buchgr/received_events","type":"User","site_admin":false},"assignees":[{"login":"buchgr","id":1388179,"avatar_url":"https://avatars.githubusercontent.com/u/1388179?v=3","gravatar_id":"","url":"https://api.github.com/users/buchgr","html_url":"https://github.com/buchgr","followers_url":"https://api.github.com/users/buchgr/followers","following_url":"https://api.github.com/users/buchgr/following{/other_user}","gists_url":"https://api.github.com/users/buchgr/gists{/gist_id}","starred_url":"https://api.github.com/users/buchgr/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/buchgr/subscriptions","organizations_url":"https://api.github.com/users/buchgr/orgs","repos_url":"https://api.github.com/users/buchgr/repos","events_url":"https://api.github.com/users/buchgr/events{/privacy}","received_events_url":"https://api.github.com/users/buchgr/received_events","type":"User","site_admin":false}],"milestone":null,"commits_url":"https://api.github.com/repos/grpc/grpc-java/pulls/2240/commits","review_comments_url":"https://api.github.com/repos/grpc/grpc-java/pulls/2240/comments","review_comment_url":"https://api.github.com/repos/grpc/grpc-java/pulls/comments{/number}","comments_url":"https://api.github.com/repos/grpc/grpc-java/issues/2240/comments","statuses_url":"https://api.github.com/repos/grpc/grpc-java/statuses/3e9b3a99f845804f55b8249f556bd6860759dfe4","head":{"label":"carl-mastrangelo:recycle","ref":"recycle","sha":"3e9b3a99f845804f55b8249f556bd6860759dfe4","user":{"login":"carl-mastrangelo","id":8943572,"avatar_url":"https://avatars.githubusercontent.com/u/8943572?v=3","gravatar_id":"","url":"https://api.github.com/users/carl-mastrangelo","html_url":"https://github.com/carl-mastrangelo","followers_url":"https://api.github.com/users/carl-mastrangelo/followers","following_url":"https://api.github.com/users/carl-mastrangelo/following{/other_user}","gists_url":"https://api.github.com/users/carl-mastrangelo/gists{/gist_id}","starred_url":"https://api.github.com/users/carl-mastrangelo/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/carl-mastrangelo/subscriptions","organizations_url":"https://api.github.com/users/carl-mastrangelo/orgs","repos_url":"https://api.github.com/users/carl-mastrangelo/repos","events_url":"https://api.github.com/users/carl-mastrangelo/events{/privacy}","received_events_url":"https://api.github.com/users/carl-mastrangelo/received_events","type":"User","site_admin":false},"repo":{"id":38781678,"name":"grpc-java","full_name":"carl-mastrangelo/grpc-java","owner":{"login":"carl-mastrangelo","id":8943572,"avatar_url":"https://avatars.githubusercontent.com/u/8943572?v=3","gravatar_id":"","url":"https://api.github.com/users/carl-mastrangelo","html_url":"https://github.com/carl-mastrangelo","followers_url":"https://api.github.com/users/carl-mastrangelo/followers","following_url":"https://api.github.com/users/carl-mastrangelo/following{/other_user}","gists_url":"https://api.github.com/users/carl-mastrangelo/gists{/gist_id}","starred_url":"https://api.github.com/users/carl-mastrangelo/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/carl-mastrangelo/subscriptions","organizations_url":"https://api.github.com/users/carl-mastrangelo/orgs","repos_url":"https://api.github.com/users/carl-mastrangelo/repos","events_url":"https://api.github.com/users/carl-mastrangelo/events{/privacy}","received_events_url":"https://api.github.com/users/carl-mastrangelo/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/carl-mastrangelo/grpc-java","description":"The Java gRPC implementation. 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