| ;; Licensed to the Apache Software Foundation (ASF) under one |
| ;; or more contributor license agreements. See the NOTICE file |
| ;; distributed with this work for additional information |
| ;; regarding copyright ownership. The ASF licenses this file |
| ;; to you 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. |
| |
| (ns backtype.storm.disruptor |
| (:import [backtype.storm.utils DisruptorQueue]) |
| (:import [com.lmax.disruptor BlockingWaitStrategy SleepingWaitStrategy YieldingWaitStrategy |
| BusySpinWaitStrategy]) |
| (:import [com.lmax.disruptor.dsl ProducerType]) |
| (:require [clojure [string :as str]]) |
| (:require [clojure [set :as set]]) |
| (:use [clojure walk]) |
| (:use [backtype.storm util log])) |
| |
| (def CLAIM-STRATEGY |
| {:multi-threaded (ProducerType/MULTI) |
| :single-threaded (ProducerType/SINGLE)}) |
| |
| (def WAIT-STRATEGY |
| {:block (fn [] (BlockingWaitStrategy.)) |
| :yield (fn [] (YieldingWaitStrategy.)) |
| :sleep (fn [] (SleepingWaitStrategy.)) |
| :spin (fn [] (BusySpinWaitStrategy.))}) |
| |
| (defn- mk-wait-strategy |
| [spec] |
| (if (keyword? spec) |
| ((WAIT-STRATEGY spec)) |
| (-> (str spec) new-instance))) |
| |
| ;; :block strategy requires using a timeout on waitFor (implemented in DisruptorQueue), as sometimes the consumer stays blocked even when there's an item on the queue. |
| ;; This would manifest itself in Trident when doing 1 batch at a time processing, and the ack_init message |
| ;; wouldn't make it to the acker until the batch timed out and another tuple was played into the queue, |
| ;; unblocking the consumer |
| (defnk disruptor-queue |
| [^String queue-name buffer-size :claim-strategy :multi-threaded :wait-strategy :block] |
| (DisruptorQueue. queue-name |
| (CLAIM-STRATEGY claim-strategy) |
| buffer-size |
| (mk-wait-strategy wait-strategy))) |
| |
| (defn clojure-handler |
| [afn] |
| (reify com.lmax.disruptor.EventHandler |
| (onEvent |
| [this o seq-id batchEnd?] |
| (afn o seq-id batchEnd?)))) |
| |
| (defmacro handler |
| [& args] |
| `(clojure-handler (fn ~@args))) |
| |
| (defn publish |
| ([^DisruptorQueue q o block?] |
| (.publish q o block?)) |
| ([q o] |
| (publish q o true))) |
| |
| (defn try-publish |
| [^DisruptorQueue q o] |
| (.tryPublish q o)) |
| |
| (defn consume-batch |
| [^DisruptorQueue queue handler] |
| (.consumeBatch queue handler)) |
| |
| (defn consume-batch-when-available |
| [^DisruptorQueue queue handler] |
| (.consumeBatchWhenAvailable queue handler)) |
| |
| (defn consumer-started! |
| [^DisruptorQueue queue] |
| (.consumerStarted queue)) |
| |
| (defn halt-with-interrupt! |
| [^DisruptorQueue queue] |
| (.haltWithInterrupt queue)) |
| |
| (defnk consume-loop* |
| [^DisruptorQueue queue handler |
| :kill-fn (fn [error] (exit-process! 1 "Async loop died!"))] |
| (let [ret (async-loop |
| (fn [] (consume-batch-when-available queue handler) 0) |
| :kill-fn kill-fn |
| :thread-name (.getName queue))] |
| (consumer-started! queue) ret)) |
| |
| (defmacro consume-loop [queue & handler-args] |
| `(let [handler# (handler ~@handler-args)] |
| (consume-loop* ~queue handler#))) |