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PeerMonitor: use CompletableFuture for lookupReverseDNS() and getAddr()

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* Create threadpool for reverseDns (rather than use new Thread() repeatedly)
* For getAddr() run completion handler on callback thread (and eliminate new Thread())
* Add getHostName() method that handles case where peerAddress.getAddr() is null
This commit is contained in:
Sean Gilligan 2022-08-18 14:58:00 -07:00 • committed by Andreas Schildbach
parent 39d799e58f
commit 94ad7dd344
1 changed files with 28 additions and 15 deletions
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35
examples/src/main/java/org/bitcoinj/examples/PeerMonitor.java
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@ -21,6 +21,7 @@ import org.bitcoinj.core.AddressMessage;
import org.bitcoinj.base.Coin;
import org.bitcoinj.core.NetworkParameters;
import org.bitcoinj.core.Peer;
import org.bitcoinj.core.PeerAddress;
import org.bitcoinj.core.PeerGroup;
import org.bitcoinj.net.discovery.DnsDiscovery;
import org.bitcoinj.params.MainNetParams;
@ -35,10 +36,11 @@ import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
/**
* Shows connected peers in a table view, so you can watch as they come and go.
@ -46,6 +48,7 @@ import java.util.concurrent.TimeoutException;
public class PeerMonitor {
private NetworkParameters params;
private PeerGroup peerGroup;
private final Executor reverseDnsThreadPool = Executors.newCachedThreadPool();
private PeerTableModel peerTableModel;
private PeerTableRenderer peerTableRenderer;
@ -82,24 +85,34 @@ public class PeerMonitor {
}
private void lookupReverseDNS(final Peer peer) {
new Thread(() -> {
// This can take a looooong time.
String reverseDns = peer.getAddress().getAddr().getCanonicalHostName();
getHostName(peer.getAddress()).thenAccept(reverseDns -> {
reverseDnsLookups.put(peer, reverseDns);
refreshUI();
}).start();
});
}
private void getAddr(final Peer peer) {
new Thread(() -> {
try {
AddressMessage addressMessage = peer.getAddr().get(15, TimeUnit.SECONDS);
peer.getAddr()
.orTimeout(15, TimeUnit.SECONDS)
.whenComplete((addressMessage, e) -> {
if (addressMessage != null) {
addressMessages.put(peer, addressMessage);
refreshUI();
} catch (InterruptedException | ExecutionException | TimeoutException e) {
} else {
e.printStackTrace();
}
}).start();
});
}
private CompletableFuture<String> getHostName(final PeerAddress peerAddress) {
if (peerAddress.getAddr() != null) {
// This can take a looooong time.
return CompletableFuture.supplyAsync(peerAddress.getAddr()::getCanonicalHostName, reverseDnsThreadPool);
} else if (peerAddress.getHostname() != null ){
return CompletableFuture.completedFuture(peerAddress.getHostname());
} else {
return CompletableFuture.completedFuture("-unavailable-");
}
}
private void refreshUI() {