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Restore mutual exclusion of sendChannelRequest() and gotResponse() in AbstractChannel (but rather than make methods synchronized do it on the queue, which itself doesn't need to be thread-safe). Regression due to 1a2351c5ee. Fixes #35.

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This commit is contained in:
Shikhar Bhushan
2011-10-02 09:47:49 +01:00
parent f83bf2cd3f
commit f1b3dbb102
1 changed files with 27 additions and 23 deletions
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50
src/main/java/net/schmizz/sshj/connection/channel/AbstractChannel.java
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@@ -53,8 +53,8 @@ import org.slf4j.LoggerFactory;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.LinkedList;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantLock;
@@ -76,7 +76,7 @@ public abstract class AbstractChannel
/** Remote recipient ID */
private int recipient;
private final Queue<Event<ConnectionException>> chanReqResponseEvents = new ConcurrentLinkedQueue<Event<ConnectionException>>();
private final Queue<Event<ConnectionException>> chanReqResponseEvents = new LinkedList<Event<ConnectionException>>();
/* The lock used by to create the open & close events */
private final ReentrantLock lock = new ReentrantLock();
@@ -368,33 +368,37 @@ public abstract class AbstractChannel
Buffer.PlainBuffer reqSpecific)
throws TransportException {
log.info("Sending channel request for `{}`", reqType);
trans.write(
newBuffer(Message.CHANNEL_REQUEST)
.putString(reqType)
.putBoolean(wantReply)
.putBuffer(reqSpecific)
);
synchronized (chanReqResponseEvents) {
trans.write(
newBuffer(Message.CHANNEL_REQUEST)
.putString(reqType)
.putBoolean(wantReply)
.putBuffer(reqSpecific)
);
Event<ConnectionException> responseEvent = null;
if (wantReply) {
responseEvent = new Event<ConnectionException>("chan#" + id + " / " + "chanreq for " + reqType,
ConnectionException.chainer);
chanReqResponseEvents.add(responseEvent);
Event<ConnectionException> responseEvent = null;
if (wantReply) {
responseEvent = new Event<ConnectionException>("chan#" + id + " / " + "chanreq for " + reqType,
ConnectionException.chainer);
chanReqResponseEvents.add(responseEvent);
}
return responseEvent;
}
return responseEvent;
}
private void gotResponse(boolean success)
throws ConnectionException {
final Event<ConnectionException> responseEvent = chanReqResponseEvents.poll();
if (responseEvent != null) {
if (success)
responseEvent.set();
else
responseEvent.deliverError(new ConnectionException("Request failed"));
} else
throw new ConnectionException(DisconnectReason.PROTOCOL_ERROR,
"Received response to channel request when none was requested");
synchronized (chanReqResponseEvents) {
final Event<ConnectionException> responseEvent = chanReqResponseEvents.poll();
if (responseEvent != null) {
if (success)
responseEvent.set();
else
responseEvent.deliverError(new ConnectionException("Request failed"));
} else
throw new ConnectionException(DisconnectReason.PROTOCOL_ERROR,
"Received response to channel request when none was requested");
}
}
private synchronized void gotEOF()