Github user sudheeshkatkam commented on a diff in the pull request:
https://github.com/apache/drill/pull/829#discussion_r117880975
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/rpc/AbstractUserClientConnectionWrapper.java
---
@@ -0,0 +1,101 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.drill.exec.rpc;
+
+import com.google.common.base.Preconditions;
+import org.apache.drill.common.exceptions.UserException;
+import org.apache.drill.common.exceptions.UserRemoteException;
+import org.apache.drill.exec.proto.GeneralRPCProtos;
+import org.apache.drill.exec.proto.UserBitShared.DrillPBError;
+import org.apache.drill.exec.proto.UserBitShared.QueryId;
+import org.apache.drill.exec.proto.UserBitShared.QueryResult;
+import org.apache.drill.exec.proto.helper.QueryIdHelper;
+
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+public abstract class AbstractUserClientConnectionWrapper implements
UserClientConnection {
+ private static final org.slf4j.Logger logger =
+
org.slf4j.LoggerFactory.getLogger(AbstractUserClientConnectionWrapper.class);
+
+ protected final CountDownLatch latch = new CountDownLatch(1);
+
+ protected volatile DrillPBError error;
+
+ protected volatile UserException exception;
+
+ /**
+ * Wait until the query has completed or timeout is passed.
+ *
+ * @throws InterruptedException
+ */
+ public boolean await(final long timeoutMillis) throws
InterruptedException {
+ return latch.await(timeoutMillis, TimeUnit.MILLISECONDS);
+ }
+
+ /**
+ * Wait indefinitely until the query is completed. Used only in case of
WebUser
+ *
+ * @throws Exception
+ */
+ public void await() throws Exception {
--- End diff --
Remove throwing exception, and check for error using `getError()` wherever
this method is invoked (or exception handling is done).
A cleaner API would be a CheckedFuture, that returns results or throws a
exception.
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