src/com/android/phone/vvm/omtp/scheduling/PostponePolicy.java

/*
 * Copyright (C) 2016 The Android Open Source 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 com.android.phone.vvm.omtp.scheduling;

import android.content.Intent;

import com.android.phone.vvm.omtp.VvmLog;

/**
 * A task with Postpone policy will not be executed immediately. It will wait for a while and if a
 * duplicated task is queued during the duration, the task will be postponed further. The task will
 * only be executed if no new task was added in postponeMillis. Useful to batch small tasks in quick
 * succession together.
 */
public class PostponePolicy implements Policy {

    private static final String TAG = "PostponePolicy";

    private final int mPostponeMillis;
    private BaseTask mTask;

    public PostponePolicy(int postponeMillis) {
        mPostponeMillis = postponeMillis;
    }

    @Override
    public void onCreate(BaseTask task, Intent intent, int flags, int startId) {
        mTask = task;
        mTask.setExecutionTime(mTask.getTimeMillis() + mPostponeMillis);
    }

    @Override
    public void onBeforeExecute() {
        // Do nothing
    }

    @Override
    public void onCompleted() {
        // Do nothing
    }

    @Override
    public void onFail() {
        // Do nothing
    }

    @Override
    public void onDuplicatedTaskAdded() {
        if (mTask.hasStarted()) {
            return;
        }
        VvmLog.d(TAG, "postponing " + mTask);
        mTask.setExecutionTime(mTask.getTimeMillis() + mPostponeMillis);
    }
}