Android Open Source - bitfynd-wallet-android Wallet Balance Loader

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License

The source code is released under:

GNU General Public License

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Java Source Code

/*
 * Copyright 2013-2014 the original author or authors.
 */*from w  w  w  .j av a 2s .  c  om*/
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package de.schildbach.wallet.ui;

import java.util.concurrent.RejectedExecutionException;

import javax.annotation.Nonnull;

import org.bitcoinj.core.Coin;
import org.bitcoinj.core.Wallet;
import org.bitcoinj.core.Wallet.BalanceType;
import org.bitcoinj.utils.Threading;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import android.content.AsyncTaskLoader;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.support.v4.content.LocalBroadcastManager;
import de.schildbach.wallet.WalletApplication;
import de.schildbach.wallet.util.ThrottlingWalletChangeListener;

/**
 * @author Andreas Schildbach
 */
public final class WalletBalanceLoader extends AsyncTaskLoader<Coin>
{
  private LocalBroadcastManager broadcastManager;
  private final Wallet wallet;

  private static final Logger log = LoggerFactory.getLogger(WalletBalanceLoader.class);

  public WalletBalanceLoader(final Context context, @Nonnull final Wallet wallet)
  {
    super(context);

    this.broadcastManager = LocalBroadcastManager.getInstance(context.getApplicationContext());
    this.wallet = wallet;
  }

  @Override
  protected void onStartLoading()
  {
    super.onStartLoading();

    wallet.addEventListener(walletChangeListener, Threading.SAME_THREAD);
    broadcastManager.registerReceiver(walletChangeReceiver, new IntentFilter(WalletApplication.ACTION_WALLET_CHANGED));

    safeForceLoad();
  }

  @Override
  protected void onStopLoading()
  {
    broadcastManager.unregisterReceiver(walletChangeReceiver);
    wallet.removeEventListener(walletChangeListener);
    walletChangeListener.removeCallbacks();

    super.onStopLoading();
  }

  @Override
  protected void onReset()
  {
    broadcastManager.unregisterReceiver(walletChangeReceiver);
    wallet.removeEventListener(walletChangeListener);
    walletChangeListener.removeCallbacks();

    super.onReset();
  }

  @Override
  public Coin loadInBackground()
  {
    return wallet.getBalance(BalanceType.ESTIMATED);
  }

  private final ThrottlingWalletChangeListener walletChangeListener = new ThrottlingWalletChangeListener()
  {
    @Override
    public void onThrottledWalletChanged()
    {
      safeForceLoad();
    }
  };

  private final BroadcastReceiver walletChangeReceiver = new BroadcastReceiver()
  {
    @Override
    public void onReceive(final Context context, final Intent intent)
    {
      safeForceLoad();
    }
  };

  private void safeForceLoad()
  {
    try
    {
      forceLoad();
    }
    catch (final RejectedExecutionException x)
    {
      log.info("rejected execution: " + WalletBalanceLoader.this.toString());
    }
  }
}

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