hu.akarnokd.reactive4java.util.DefaultGwtScheduler.java Source code

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Here is the source code for hu.akarnokd.reactive4java.util.DefaultGwtScheduler.java

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/*
 * Copyright 2011 David Karnok
 *
 * 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 hu.akarnokd.reactive4java.util;

import hu.akarnokd.reactive4java.base.Scheduler;

import java.io.Closeable;
import java.io.IOException;

import com.google.gwt.user.client.Timer;

/**
 * The default implementation of the Scheduler
 * interface used by the <code>Reactive</code> operators
 * for a GWT environment.
 * @author akarnokd, 2011.02.02.
 */
public class DefaultGwtScheduler implements Scheduler {

    @Override
    public Closeable schedule(final Runnable run) {
        final Timer timer = new Timer() {
            @Override
            public void run() {
                run.run();
            }
        };
        timer.schedule(1);
        return new Closeable() {
            @Override
            public void close() throws IOException {
                timer.cancel();
            }
        };
    }

    @Override
    public Closeable schedule(final Runnable run, long delay) {
        final Timer timer = new Timer() {
            @Override
            public void run() {
                run.run();
            }
        };
        timer.schedule((int) (delay / 1000000L));
        return new Closeable() {
            @Override
            public void close() throws IOException {
                timer.cancel();
            }
        };
    }

    @Override
    public Closeable schedule(final Runnable run, long initialDelay, final long betweenDelay) {
        final Timer outerTimer = new Timer() {
            /** The inner timer. */
            final Timer timer = new Timer() {
                @Override
                public void run() {
                    try {
                        run.run();
                    } catch (Throwable ex) {
                        timer.cancel();
                    }
                }
            };

            @Override
            public void run() {
                timer.run();
                timer.scheduleRepeating((int) (betweenDelay / 1000000L));
            }

            @Override
            public void cancel() {
                timer.cancel();
                super.cancel();
            }
        };
        outerTimer.schedule((int) (initialDelay / 1000000L));
        return new Closeable() {
            @Override
            public void close() throws IOException {
                outerTimer.cancel();
            }
        };
    }

}