de.mhus.lib.core.MWeakTimerTask Maven / Gradle / Ivy

Go to download
/**
 * Copyright 2018 Mike Hummel
 *
 * 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.
 */
/**
 * w * Copyright 2018 Mike Hummel
 *
 * 
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 de.mhus.lib.core;

import java.lang.ref.WeakReference;
import java.util.TimerTask;

import de.mhus.lib.basics.Named;

public class MWeakTimerTask extends TimerTask implements Named {

    private boolean canceled = false;
    private String name;
    private WeakReference task;

    public MWeakTimerTask(TimerTask task) {
        this.task = new WeakReference<>(task);
        setName(MSystem.getClassName(this));
    }

    @Override
    public final void run() {
        boolean error = false;
        try {
            doit();
        } catch (Throwable t) {
            try {
                onError(t);
            } catch (Throwable t1) {
            }
            error = true;
        }
        try {
            onFinal(error);
        } catch (Throwable t) {
        }
    }

    protected void onError(Throwable t) {
        t.printStackTrace();
    }

    protected void onFinal(boolean isError) {}

    protected void doit() throws Exception {
        if (task == null) {
            cancel();
            return;
        }
        TimerTask taskTask = task.get();
        if (taskTask == null || MTimerTask.getStatus(taskTask) == MTimerTask.CANCELLED) {
            cancel();
            return;
        }

        taskTask.run();
    }

    @Override
    public boolean cancel() {
        setCanceled(true);
        return super.cancel();
    }

    public boolean isCanceled() {
        return canceled;
    }

    public void setCanceled(boolean canceled) {
        this.canceled = canceled;
    }

    @Override
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}