| /* |
| * 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. |
| */ |
| package org.apache.usergrid.corepersistence.asyncevents.direct; |
| |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.concurrent.*; |
| import java.util.function.Consumer; |
| |
| /** |
| * Bufferes events and dispatched then in batches. |
| * Ensures that the callback will be called at a min interval. |
| */ |
| public class BufferedQueueImpl<T> implements BufferedQueue<T> { |
| |
| private String fileName = "my_file_name.txt"; |
| private Consumer<List<T>> consumer; |
| |
| ScheduledThreadPoolExecutor threadPool = new ScheduledThreadPoolExecutor(1); |
| |
| private final LinkedBlockingQueue<PendingDispatch> queue; |
| private final long intervalNanos; |
| private long timeOfLastDispatch = 0L; |
| |
| public BufferedQueueImpl(int size, long interval , TimeUnit intervalTimeUnit) { |
| |
| Runtime.getRuntime().addShutdownHook(new Thread(new DispatchTask())); |
| |
| this.intervalNanos = intervalTimeUnit.toNanos(interval); |
| threadPool.scheduleAtFixedRate(new DispatchTask(), intervalNanos,intervalNanos, TimeUnit.NANOSECONDS); |
| readBatchFile(); |
| queue = new LinkedBlockingQueue<>(size); |
| } |
| |
| public boolean offer(T t) { |
| PendingDispatch pd = new PendingDispatch(t); |
| if (timeOfLastDispatch + intervalNanos < System.nanoTime()) { |
| dispatchOne(pd); |
| return true; |
| } |
| try { |
| return queue.offer(pd, intervalNanos, TimeUnit.NANOSECONDS); |
| } catch (InterruptedException e) { |
| return false; |
| } |
| } |
| |
| public void setConsumer(Consumer<List<T>> consumer) { |
| this.consumer = consumer; |
| } |
| |
| |
| private void dispatchOne(PendingDispatch pd) { |
| List<PendingDispatch> messages = new ArrayList<>(); |
| messages.add(pd); |
| dispatchMessages(messages); |
| } |
| |
| protected void dispatchAll() { |
| if (!queue.isEmpty()) { |
| List<PendingDispatch> messages = new ArrayList<>(); |
| queue.drainTo(messages); |
| dispatchMessages(messages); |
| } |
| } |
| |
| private void dispatchMessages(List<PendingDispatch> messages) { |
| List<T> m = new ArrayList<>(); |
| for (PendingDispatch pd : messages) { |
| if (!pd.isCancelled()) { |
| m.add(pd.getWrapped()); |
| } |
| } |
| timeOfLastDispatch = System.nanoTime(); |
| Boolean sent = Boolean.TRUE; |
| try { |
| consumer.accept(m); |
| } catch (Exception e) { |
| sent = Boolean.FALSE; |
| } |
| for (PendingDispatch pd : messages) { |
| pd.setResult(sent); |
| } |
| } |
| |
| |
| public int size() { |
| return queue.size(); |
| } |
| |
| private void readBatchFile() { |
| |
| } |
| |
| |
| // |
| // Internal Helper classes |
| // |
| |
| |
| |
| private class PendingDispatch implements Future<Boolean> { |
| T wrapped; |
| boolean canceled; |
| boolean done; |
| Boolean result = null; |
| |
| PendingDispatch(T wrapped) { |
| this.wrapped = wrapped; |
| canceled = false; |
| done = false; |
| } |
| |
| T getWrapped() { |
| return wrapped; |
| } |
| |
| void setResult(Boolean b) { |
| result = b; |
| done = true; |
| synchronized (this) { |
| notify(); |
| } |
| } |
| |
| @Override |
| public boolean cancel(boolean mayInterruptIfRunning) { |
| canceled = true; |
| return canceled; |
| } |
| |
| @Override |
| public boolean isCancelled() { |
| return canceled; |
| } |
| |
| @Override |
| public boolean isDone() { |
| return done; |
| } |
| |
| @Override |
| public Boolean get() throws InterruptedException, ExecutionException { |
| while (!done) { |
| synchronized (this) { |
| wait(100); |
| } |
| } |
| return result; |
| } |
| |
| @Override |
| public Boolean get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException { |
| if (!done) { |
| synchronized (this) { |
| wait(unit.toMillis(timeout)); |
| } |
| } |
| return result; |
| } |
| } |
| |
| |
| private class DispatchTask implements Runnable { |
| @Override |
| public void run() { |
| try { |
| dispatchAll(); |
| } catch (Throwable t) { |
| } |
| } |
| } |
| |
| } |