/*
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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.os.Handler;
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import android.os.Looper;
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import android.os.Message;
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import android.os.SystemClock;
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final class HandlerPoster extends Handler {
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private final PendingPostQueue queue;
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private final int maxMillisInsideHandleMessage;
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private final EventBus eventBus;
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private boolean handlerActive;
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HandlerPoster(EventBus eventBus, Looper looper, int maxMillisInsideHandleMessage) {
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super(looper);
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this.eventBus = eventBus;
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this.maxMillisInsideHandleMessage = maxMillisInsideHandleMessage;
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queue = new PendingPostQueue();
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}
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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 (!handlerActive) {
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handlerActive = true;
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if (!sendMessage(obtainMessage())) {
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throw new EventBusException("Could not send handler message");
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}
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}
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}
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}
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@Override
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public void handleMessage(Message msg) {
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boolean rescheduled = false;
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try {
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long started = SystemClock.uptimeMillis();
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while (true) {
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PendingPost pendingPost = queue.poll();
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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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handlerActive = 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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long timeInMethod = SystemClock.uptimeMillis() - started;
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if (timeInMethod >= maxMillisInsideHandleMessage) {
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if (!sendMessage(obtainMessage())) {
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throw new EventBusException("Could not send handler message");
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}
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rescheduled = true;
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return;
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}
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}
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} finally {
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handlerActive = rescheduled;
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}
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}
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}
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