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Simplify FetchBlock by updating it to the latest APIs.

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This commit is contained in:
Mike Hearn 2013-01-16 17:53:01 +01:00
parent 22f8034de8
commit 707e3a0989
1 changed files with 7 additions and 19 deletions
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26
examples/src/main/java/com/google/bitcoin/examples/FetchBlock.java
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@ -19,40 +19,28 @@ package com.google.bitcoin.examples;
import com.google.bitcoin.core.*;
import com.google.bitcoin.store.BlockStore;
import com.google.bitcoin.store.MemoryBlockStore;
import com.google.bitcoin.utils.BriefLogFormatter;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Future;
import org.jboss.netty.channel.ChannelFuture;
/**
* Downloads the block given a block hash from the localhost node and prints it out.
*/
public class FetchBlock {
public static void main(String[] args) throws Exception {
BriefLogFormatter.init();
System.out.println("Connecting to node");
final NetworkParameters params = NetworkParameters.testNet();
BlockStore blockStore = new MemoryBlockStore(params);
BlockChain chain = new BlockChain(params, blockStore);
PeerGroup peerGroup = new PeerGroup(params, chain);
peerGroup.start();
final CountDownLatch latch = new CountDownLatch(1);
peerGroup.addEventListener(new AbstractPeerEventListener() {
@Override
public void onPeerConnected(Peer peer, int peerCount) {
latch.countDown();
}
});
ChannelFuture channelFuture =
peerGroup.connectTo(new InetSocketAddress(InetAddress.getLocalHost(), params.port));
latch.await();
Peer peer = PeerGroup.peerFromChannelFuture(channelFuture);
peerGroup.startAndWait();
PeerAddress addr = new PeerAddress(InetAddress.getLocalHost(), params.port, 31000);
peerGroup.addAddress(addr);
peerGroup.waitForPeers(1).get();
Peer peer = peerGroup.getConnectedPeers().get(0);
Sha256Hash blockHash = new Sha256Hash(args[0]);
Future<Block> future = peer.getBlock(blockHash);