127 lines
3.4 KiB
Java
127 lines
3.4 KiB
Java
/**
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* Copyright (C) 2014 Open Whisper Systems
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.session.libsession.utilities;
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import androidx.annotation.Nullable;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.concurrent.Callable;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.Executor;
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import java.util.concurrent.FutureTask;
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public class ListenableFutureTask<V> extends FutureTask<V> {
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private final List<FutureTaskListener<V>> listeners = new LinkedList<>();
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@Nullable
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private final Object identifier;
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@Nullable
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private final Executor callbackExecutor;
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public ListenableFutureTask(Callable<V> callable) {
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this(callable, null);
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}
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public ListenableFutureTask(Callable<V> callable, @Nullable Object identifier) {
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this(callable, identifier, null);
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}
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public ListenableFutureTask(Callable<V> callable, @Nullable Object identifier, @Nullable Executor callbackExecutor) {
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super(callable);
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this.identifier = identifier;
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this.callbackExecutor = callbackExecutor;
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}
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public ListenableFutureTask(final V result) {
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this(result, null);
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}
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public ListenableFutureTask(final V result, @Nullable Object identifier) {
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super(new Callable<V>() {
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@Override
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public V call() throws Exception {
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return result;
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}
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});
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this.identifier = identifier;
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this.callbackExecutor = null;
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this.run();
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}
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public synchronized void addListener(FutureTaskListener<V> listener) {
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if (this.isDone()) {
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callback(listener);
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} else {
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this.listeners.add(listener);
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}
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}
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public synchronized void removeListener(FutureTaskListener<V> listener) {
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this.listeners.remove(listener);
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}
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@Override
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protected synchronized void done() {
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callback();
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}
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private void callback() {
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Runnable callbackRunnable = new Runnable() {
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@Override
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public void run() {
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for (FutureTaskListener<V> listener : listeners) {
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callback(listener);
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}
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}
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};
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if (callbackExecutor == null) callbackRunnable.run();
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else callbackExecutor.execute(callbackRunnable);
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}
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private void callback(FutureTaskListener<V> listener) {
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if (listener != null) {
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try {
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listener.onSuccess(get());
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} catch (InterruptedException e) {
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throw new AssertionError(e);
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} catch (ExecutionException e) {
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listener.onFailure(e);
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}
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}
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}
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@Override
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public boolean equals(Object other) {
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if (other != null && other instanceof ListenableFutureTask && this.identifier != null) {
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return identifier.equals(other);
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} else {
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return super.equals(other);
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}
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}
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@Override
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public int hashCode() {
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if (identifier != null) return identifier.hashCode();
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else return super.hashCode();
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}
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}
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