79 lines
2.5 KiB
Java
79 lines
2.5 KiB
Java
/*
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* Copyright 2016 Christian Basler
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package ch.dissem.apps.abit.service;
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import android.content.ComponentName;
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import android.content.Context;
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import android.content.Intent;
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import android.content.ServiceConnection;
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import android.os.IBinder;
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import java.util.LinkedList;
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import java.util.Queue;
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import ch.dissem.apps.abit.service.ProofOfWorkService.PowBinder;
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import ch.dissem.apps.abit.service.ProofOfWorkService.PowItem;
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import ch.dissem.bitmessage.ports.ProofOfWorkEngine;
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import static android.content.Context.BIND_AUTO_CREATE;
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/**
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* Proof of Work engine that uses the Proof of Work service.
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*/
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public class ServicePowEngine implements ProofOfWorkEngine {
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private final Context ctx;
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private static final Object lock = new Object();
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private final Queue<PowItem> queue = new LinkedList<>();
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private PowBinder service;
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public ServicePowEngine(Context ctx) {
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this.ctx = ctx;
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}
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private final ServiceConnection connection = new ServiceConnection() {
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@Override
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public void onServiceConnected(ComponentName name, IBinder service) {
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synchronized (lock) {
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ServicePowEngine.this.service = (PowBinder) service;
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while (!queue.isEmpty()) {
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ServicePowEngine.this.service.process(queue.poll());
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}
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}
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}
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@Override
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public void onServiceDisconnected(ComponentName name) {
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service = null;
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}
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};
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@Override
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public void calculateNonce(byte[] initialHash, byte[] targetValue, Callback callback) {
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PowItem item = new PowItem(initialHash, targetValue, callback);
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synchronized (lock) {
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if (service != null) {
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service.process(item);
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} else {
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queue.add(item);
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ctx.bindService(new Intent(ctx, ProofOfWorkService.class), connection,
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BIND_AUTO_CREATE);
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}
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}
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}
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}
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