JobServiceConnection.java

// Copyright 2016 Google, Inc.
//
// 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.firebase.jobdispatcher;

import static com.firebase.jobdispatcher.ExecutionDelegator.TAG;

import android.content.ComponentName;
import android.content.ServiceConnection;
import android.os.IBinder;
import android.os.Message;
import android.support.annotation.VisibleForTesting;
import android.util.Log;

/**
 * ServiceConnection for job execution.
 */
@VisibleForTesting
class JobServiceConnection implements ServiceConnection {

    private final JobInvocation jobInvocation;
    // Should be sent only once. Can't be reused.
    private final Message jobFinishedMessage;
    private boolean wasMessageUsed = false;

    //Guarded by "this". Can be updated from main and binder threads.
    private JobService.LocalBinder binder;

    JobServiceConnection(JobInvocation jobInvocation, Message jobFinishedMessage) {
        this.jobFinishedMessage = jobFinishedMessage;
        this.jobInvocation = jobInvocation;
        this.jobFinishedMessage.obj = this.jobInvocation;
    }

    @Override
    public synchronized void onServiceConnected(ComponentName name, IBinder service) {
        if (!(service instanceof JobService.LocalBinder)) {
            Log.w(TAG, "Unknown service connected");
            return;
        }
        if (wasMessageUsed) {
            Log.w(TAG, "onServiceConnected Duplicate calls. Ignored.");
            return;
        } else {
            wasMessageUsed = true;
        }

        binder = (JobService.LocalBinder) service;

        JobService jobService = binder.getService();

        jobService.start(jobInvocation, jobFinishedMessage);
    }

    @Override
    public synchronized void onServiceDisconnected(ComponentName name) {
        binder = null;
    }

    synchronized boolean isBound() {
        return binder != null;
    }

    synchronized void onStop() {
        if (isBound()) {
            binder.getService().stop(jobInvocation);
        }
    }
}