Github user laurentgo commented on a diff in the pull request:
https://github.com/apache/drill/pull/858#discussion_r149274342
--- Diff:
exec/jdbc/src/main/java/org/apache/drill/jdbc/impl/TimeoutTrigger.java ---
@@ -0,0 +1,87 @@
+/**
+ * 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.jdbc.impl;
+
+import java.sql.SQLException;
+import java.util.concurrent.Callable;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.calcite.avatica.AvaticaStatement;
+import org.apache.drill.jdbc.DrillStatement;
+import org.apache.drill.jdbc.SqlTimeoutException;
+
+/**
+ * Timeout Trigger required for canceling of running queries
+ */
+class TimeoutTrigger implements Callable<Boolean> {
+ private int timeoutInSeconds;
+ private AvaticaStatement statementHandle;
+ private Future<Boolean> triggerFuture;
+ private DrillConnectionImpl connectionHandle;
+
+ public boolean isTriggered() {
+ return (triggerFuture != null);
+ }
+
+
+ //Default Constructor is Invalid
+ @SuppressWarnings("unused")
+ private TimeoutTrigger() {}
+
+ /**
+ * Timeout Constructor
+ * @param stmtContext Statement Handle
+ * @param timeoutInSec Timeout defined in seconds
+ * @throws SQLException
+ */
+ TimeoutTrigger(AvaticaStatement stmtContext, int timeoutInSec) throws
SQLException {
+ timeoutInSeconds = timeoutInSec;
+ statementHandle = stmtContext;
+ connectionHandle = (DrillConnectionImpl) ((DrillStatement)
stmtContext).getConnection();
+ }
+
+ @Override
+ public Boolean call() throws Exception {
+ try {
+ TimeUnit.SECONDS.sleep(timeoutInSeconds);
+ } catch (InterruptedException e) {
+ //Skip interruption that occur due due to query completion
+ }
+ try {
+ if (!statementHandle.isClosed()) {
+ // Cancel Statement
+ ((DrillStatement) statementHandle).cancelDueToTimeout();
+ }
+ } catch (SqlTimeoutException toe) {
+ throw toe;
+ }
+ return false;
+ }
+
+ /**
+ * Start the timer
+ * @return
+ */
+ public Future<Boolean> startCountdown() {
+ if (!isTriggered()) {
--- End diff --
I believe a new future needs to be created each time (because it is a new
statement).
---
