/*
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* Copyright (C) 2012 Markus Junginger, greenrobot (http://greenrobot.de)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package de.greenrobot.event;
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import android.util.Log;
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/**
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* Posts events in background.
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*
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* @author Markus
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*/
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final class BackgroundPoster implements Runnable {
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private final PendingPostQueue queue;
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private final EventBus eventBus;
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private volatile boolean executorRunning;
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BackgroundPoster(EventBus eventBus) {
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this.eventBus = eventBus;
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queue = new PendingPostQueue();
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}
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public void enqueue(Subscription subscription, Object event) {
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PendingPost pendingPost = PendingPost.obtainPendingPost(subscription, event);
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synchronized (this) {
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queue.enqueue(pendingPost);
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if (!executorRunning) {
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executorRunning = true;
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eventBus.getExecutorService().execute(this);
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}
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}
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}
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@Override
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public void run() {
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try {
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try {
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while (true) {
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PendingPost pendingPost = queue.poll(1000);
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if (pendingPost == null) {
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synchronized (this) {
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// Check again, this time in synchronized
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pendingPost = queue.poll();
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if (pendingPost == null) {
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executorRunning = false;
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return;
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}
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}
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}
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eventBus.invokeSubscriber(pendingPost);
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}
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} catch (InterruptedException e) {
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Log.w("Event", Thread.currentThread().getName() + " was interruppted", e);
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}
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} finally {
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executorRunning = false;
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}
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}
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}
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