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125 lines (112 loc) · 3.08 KB
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/**
* Copyright (C) 2010-2016 eBusiness Information, Excilys Group
* Copyright (C) 2016-2020 the AndroidAnnotations project
*
* Licensed 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.androidannotations.api;
import java.util.HashMap;
import java.util.Map;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.os.SystemClock;
/**
* This class provide operations for
* {@link org.androidannotations.annotations.UiThread UiThread} tasks.
*/
public final class UiThreadExecutor {
private static final Handler HANDLER = new Handler(Looper.getMainLooper()) {
@Override
public void handleMessage(Message msg) {
Runnable callback = msg.getCallback();
if (callback != null) {
callback.run();
decrementToken((Token) msg.obj);
} else {
super.handleMessage(msg);
}
}
};
private static final Map<String, Token> TOKENS = new HashMap<>();
private UiThreadExecutor() {
// should not be instantiated
}
/**
* Store a new task in the map for providing cancellation. This method is used
* by AndroidAnnotations and not intended to be called by clients.
*
* @param id
* the identifier of the task
* @param task
* the task itself
* @param delay
* the delay or zero to run immediately
*/
public static void runTask(String id, Runnable task, long delay) {
if ("".equals(id)) {
HANDLER.postDelayed(task, delay);
return;
}
long time = SystemClock.uptimeMillis() + delay;
HANDLER.postAtTime(task, nextToken(id), time);
}
private static Token nextToken(String id) {
synchronized (TOKENS) {
Token token = TOKENS.get(id);
if (token == null) {
token = new Token(id);
TOKENS.put(id, token);
}
token.runnablesCount++;
return token;
}
}
private static void decrementToken(Token token) {
synchronized (TOKENS) {
if (--token.runnablesCount == 0) {
String id = token.id;
Token old = TOKENS.remove(id);
if (old != token) {
// a runnable finished after cancelling, we just removed a
// wrong token, lets put it back
TOKENS.put(id, old);
}
}
}
}
/**
* Cancel all tasks having the specified <code>id</code>.
*
* @param id
* the cancellation identifier
*/
public static void cancelAll(String id) {
Token token;
synchronized (TOKENS) {
token = TOKENS.remove(id);
}
if (token == null) {
// nothing to cancel
return;
}
HANDLER.removeCallbacksAndMessages(token);
}
private static final class Token {
int runnablesCount = 0;
final String id;
private Token(String id) {
this.id = id;
}
}
}