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A collection of useful tools that use the bitcoinj library to perform wallet operations
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/*
 * Copyright 2013 Google Inc.
 * Copyright 2014 Andreas Schildbach
 *
 * 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 org.bitcoinj.tools;

import java.util.HashMap;
import java.util.Map;

import org.bitcoinj.core.listeners.*;
import org.bitcoinj.core.NetworkParameters;
import org.bitcoinj.core.Peer;
import org.bitcoinj.core.PeerGroup;
import org.bitcoinj.core.Transaction;
import org.bitcoinj.net.discovery.DnsDiscovery;
import org.bitcoinj.params.MainNetParams;
import org.bitcoinj.utils.BriefLogFormatter;
import org.bitcoinj.wallet.DefaultRiskAnalysis;
import org.bitcoinj.wallet.RiskAnalysis.Result;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.collect.ImmutableList;

public class WatchMempool {
    private static Logger log = LoggerFactory.getLogger(WatchMempool.class);
    private static final NetworkParameters PARAMS = MainNetParams.get();
    private static final ImmutableList NO_DEPS = ImmutableList.of();
    private static final Map counters = new HashMap();
    private static final String TOTAL_KEY = "TOTAL";
    private static final long START_MS = System.currentTimeMillis();
    private static final long STATISTICS_FREQUENCY_MS = 1000 * 5;

    public static void main(String[] args) throws InterruptedException {
        BriefLogFormatter.init();
        PeerGroup peerGroup = new PeerGroup(PARAMS);
        peerGroup.setMaxConnections(32);
        peerGroup.addPeerDiscovery(new DnsDiscovery(PARAMS));
        peerGroup.addOnTransactionBroadcastListener(new OnTransactionBroadcastListener() {
            @Override
            public void onTransaction(Peer peer, Transaction tx) {
                Result result = DefaultRiskAnalysis.FACTORY.create(null, tx, NO_DEPS).analyze();
                incrementCounter(TOTAL_KEY);
                log.info("tx {} result {}", tx.getHash(), result);
                incrementCounter(result.name());
                if (result == Result.NON_STANDARD)
                    incrementCounter(Result.NON_STANDARD + "-" + DefaultRiskAnalysis.isStandard(tx));
            }
        });
        peerGroup.start();

        while (true) {
            Thread.sleep(STATISTICS_FREQUENCY_MS);
            printCounters();
        }
    }

    private static synchronized void incrementCounter(String name) {
        Integer count = counters.get(name);
        if (count == null)
            count = 0;
        count++;
        counters.put(name, count);
    }

    private static synchronized void printCounters() {
        System.out.printf("Runtime: %d minutes\n", (System.currentTimeMillis() - START_MS) / 1000 / 60);
        Integer total = counters.get(TOTAL_KEY);
        if (total == null)
            return;
        for (Map.Entry counter : counters.entrySet()) {
            System.out.printf("  %-40s%6d  (%d%% of total)\n", counter.getKey(), counter.getValue(),
                    (int) counter.getValue() * 100 / total);
        }
    }
}