jetbrains.jetpad.base.edt.JsEventDispatchThread.java Source code

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Here is the source code for jetbrains.jetpad.base.edt.JsEventDispatchThread.java

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/*
 * Copyright 2012-2016 JetBrains s.r.o
 *
 * 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 jetbrains.jetpad.base.edt;

import com.google.gwt.core.client.JavaScriptException;
import com.google.gwt.core.client.Scheduler;
import com.google.gwt.user.client.Timer;
import jetbrains.jetpad.base.Registration;
import jetbrains.jetpad.base.ThrowableHandlers;

import java.util.logging.Logger;

public final class JsEventDispatchThread implements EventDispatchThread {
    private static final Logger LOG = Logger.getLogger(JsEventDispatchThread.class.getName());

    public static final JsEventDispatchThread INSTANCE = new JsEventDispatchThread();

    private JsEventDispatchThread() {
    }

    @Override
    public long getCurrentTimeMillis() {
        return System.currentTimeMillis();
    }

    @Override
    public void schedule(final Runnable r) {
        Scheduler.get().scheduleFinally(new Scheduler.ScheduledCommand() {
            @Override
            public void execute() {
                doExecute(r);
            }
        });
    }

    @Override
    public Registration schedule(int delay, final Runnable r) {
        Timer timer = new Timer() {
            @Override
            public void run() {
                doExecute(r);
            }
        };
        timer.schedule(delay);
        return timerReg(timer);
    }

    @Override
    public Registration scheduleRepeating(final int period, final Runnable r) {
        Timer timer = new Timer() {
            private long myLastInvocation = 0L;

            @Override
            public void run() {
                long current = getCurrentTimeMillis();
                if (current - myLastInvocation < period)
                    return;
                myLastInvocation = current;
                doExecute(r);
            }
        };
        timer.scheduleRepeating(period);
        return timerReg(timer);
    }

    private void doExecute(Runnable r) {
        try {
            r.run();
        } catch (JavaScriptException jse) {
            if (jse.isThrownSet()) {
                LOG.severe("Caught JavaScriptException, wrapped error is: " + jse.getThrown());
            }
            ThrowableHandlers.handle(jse);
        } catch (Throwable t) {
            ThrowableHandlers.handle(t);
        }
    }

    private Registration timerReg(final Timer timer) {
        return new Registration() {
            @Override
            protected void doRemove() {
                if (timer.isRunning()) {
                    timer.cancel();
                }
            }
        };
    }
}