/* Receive a response.
* Because only one receiver, so no synchronization on in.
*/
protected void receiveResponse() {
if (shouldCloseConnection.get()) {
return;
}
touch();
try {
// See HBaseServer.Call.setResponse for where we write out the response.
// It writes the call.id (int), a flag byte, then optionally the length
// of the response (int) followed by data.
// Read the call id.
int id = in.readInt();
if (LOG.isDebugEnabled()) LOG.debug(getName() + " got value #" + id);
Call call = calls.get(id);
// Read the flag byte
byte flag = in.readByte();
boolean isError = ResponseFlag.isError(flag);
if (ResponseFlag.isLength(flag)) {
// Currently length if present is unused.
in.readInt();
}
int state = in.readInt(); // Read the state. Currently unused.
if (isError) {
if (call != null) {
//noinspection ThrowableInstanceNeverThrown
call.setException(
new RemoteException(WritableUtils.readString(in), WritableUtils.readString(in)));
}
} else {
Writable value = ReflectionUtils.newInstance(valueClass, conf);
value.readFields(in); // read value
// it's possible that this call may have been cleaned up due to a RPC
// timeout, so check if it still exists before setting the value.
if (call != null) {
call.setValue(value);
}
}
calls.remove(id);
} catch (IOException e) {
if (e instanceof SocketTimeoutException && remoteId.rpcTimeout > 0) {
// Clean up open calls but don't treat this as a fatal condition,
// since we expect certain responses to not make it by the specified
// {@link ConnectionId#rpcTimeout}.
closeException = e;
} else {
// Since the server did not respond within the default ping interval
// time, treat this as a fatal condition and close this connection
markClosed(e);
}
} finally {
if (remoteId.rpcTimeout > 0) {
cleanupCalls(remoteId.rpcTimeout);
}
}
}
