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Make Peer.downloadData() atomic rather than locked under the Peer lock.

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Resolves issue 310.
This commit is contained in:
Mike Hearn 2013-02-15 15:48:53 +01:00
parent 38ec23299c
commit 4bcb550796
1 changed files with 11 additions and 8 deletions
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19
core/src/main/java/com/google/bitcoin/core/Peer.java
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@ -33,6 +33,7 @@ import java.net.InetSocketAddress;
import java.util.*;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
import java.util.concurrent.locks.ReentrantLock;
@ -61,7 +62,7 @@ public class Peer {
// Whether to try and download blocks and transactions from this peer. Set to false by PeerGroup if not the
// primary peer. This is to avoid redundant work and concurrency problems with downloading the same chain
// in parallel.
private boolean downloadData = false;
private final AtomicBoolean downloadData = new AtomicBoolean();
// The version data to announce to the other side of the connections we make: useful for setting our "user agent"
// equivalent and other things.
private final VersionMessage versionMessage;
@ -124,7 +125,7 @@ public class Peer {
this.params = Preconditions.checkNotNull(params);
this.versionMessage = Preconditions.checkNotNull(ver);
this.blockChain = chain; // Allowed to be null.
this.downloadData = chain != null;
this.downloadData.set(chain != null);
this.getDataFutures = new CopyOnWriteArrayList<GetDataRequest>();
this.eventListeners = new CopyOnWriteArrayList<PeerEventListener>();
this.lifecycleListeners = new CopyOnWriteArrayList<PeerLifecycleListener>();
@ -632,7 +633,7 @@ public class Peer {
// Was this block requested by getBlock()?
if (maybeHandleRequestedData(m)) return;
if (!downloadData) {
if (!downloadData.get()) {
// This can happen if we lose download peer status after requesting block data.
log.debug("{}: Received block we did not ask for: {}", address.get(), m.getHashAsString());
return;
@ -674,7 +675,7 @@ public class Peer {
private synchronized void processFilteredBlock(FilteredBlock m) throws IOException {
log.debug("{}: Received broadcast filtered block {}", address.get(), m.getHash().toString());
try {
if (!downloadData) {
if (!downloadData.get()) {
log.debug("{}: Received block we did not ask for: {}", address.get(), m.getHash().toString());
return;
}
@ -761,6 +762,8 @@ public class Peer {
}
}
final boolean downloadData = this.downloadData.get();
if (transactions.size() == 0 && blocks.size() == 1) {
// Single block announcement. If we're downloading the chain this is just a tickle to make us continue
// (the block chain download protocol is very implicit and not well thought out). If we're not downloading
@ -1182,16 +1185,16 @@ public class Peer {
* Returns true if this peer will try and download things it is sent in "inv" messages. Normally you only need
* one peer to be downloading data. Defaults to true.
*/
public synchronized boolean getDownloadData() {
return downloadData;
public boolean getDownloadData() {
return downloadData.get();
}
/**
* If set to false, the peer won't try and fetch blocks and transactions it hears about. Normally, only one
* peer should download missing blocks. Defaults to true.
*/
public synchronized void setDownloadData(boolean downloadData) {
this.downloadData = downloadData;
public void setDownloadData(boolean downloadData) {
this.downloadData.set(downloadData);
}
/**