62 lines
1.9 KiB
Java
62 lines
1.9 KiB
Java
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.concurrent.Semaphore;
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import ch.dissem.apps.abit.service.ProofOfWorkService.PowBinder;
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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, ProofOfWorkEngine.Callback {
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private final Semaphore semaphore = new Semaphore(1, true);
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private final Context ctx;
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private byte[] initialHash, targetValue;
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private Callback callback;
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public ServicePowEngine(Context ctx) {
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this.ctx = ctx;
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}
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private ServiceConnection connection = new ServiceConnection() {
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@Override
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public void onServiceConnected(ComponentName name, IBinder service) {
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((PowBinder) service).getEngine().calculateNonce(initialHash, targetValue, ServicePowEngine.this);
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}
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@Override
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public void onServiceDisconnected(ComponentName name) {
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semaphore.release();
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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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try {
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semaphore.acquire();
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} catch (InterruptedException e) {
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throw new RuntimeException(e);
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}
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this.initialHash = initialHash;
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this.targetValue = targetValue;
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this.callback = callback;
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ctx.bindService(new Intent(ctx, ProofOfWorkService.class), connection, BIND_AUTO_CREATE);
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}
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@Override
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public void onNonceCalculated(byte[] initialHash, byte[] bytes) {
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callback.onNonceCalculated(initialHash, bytes);
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ctx.unbindService(connection);
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}
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}
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