/**
* Makes a set of calls in parallel. Each parameter is sent to the corresponding address. When all
* values are available, or have timed out or errored, the collected results are returned in an
* array. The array contains nulls for calls that timed out or errored.
*/
public Writable[] call(
Writable[] params,
InetSocketAddress[] addresses,
Class<? extends VersionedProtocol> protocol,
User ticket)
throws IOException, InterruptedException {
if (addresses.length == 0) return new Writable[0];
ParallelResults results = new ParallelResults(params.length);
// TODO this synchronization block doesnt make any sense, we should possibly fix it
//noinspection SynchronizationOnLocalVariableOrMethodParameter
synchronized (results) {
for (int i = 0; i < params.length; i++) {
ParallelCall call = new ParallelCall(params[i], results, i);
try {
Connection connection = getConnection(addresses[i], protocol, ticket, 0, call);
connection.sendParam(call); // send each parameter
} catch (IOException e) {
// log errors
LOG.info("Calling " + addresses[i] + " caught: " + e.getMessage(), e);
results.size--; // wait for one fewer result
}
}
while (results.count != results.size) {
try {
results.wait(); // wait for all results
} catch (InterruptedException ignored) {
}
}
return results.values;
}
}
/** Deliver result to result collector. */
@Override
protected void callComplete() {
results.callComplete(this);
}
