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/*
* 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.work.foreman.rm;
import org.apache.drill.exec.work.foreman.rm.QueryQueue.QueryQueueException;
import org.apache.drill.exec.work.foreman.rm.QueryQueue.QueueTimeoutException;
/**
* Extends a {@link QueryResourceAllocator} to provide queueing support.
*/
public interface QueryResourceManager extends QueryResourceAllocator {
/**
* Hint that this resource manager queues. Allows the Foreman
* to short-circuit expensive logic if no queuing will actually
* be done. This is a static attribute per Drillbit run.
*/
boolean hasQueue();
/**
* For some cases the foreman does not have a full plan, just a cost. In
* this case, this object will not plan memory, but still needs the cost
* to place the job into the correct queue.
* @param cost
*/
void setCost(double cost);
/**
* Admit the query into the cluster. Blocks until the query
* can run. (Later revisions may use a more thread-friendly
* approach.)
* @throws QueryQueueException if something goes wrong with the
* queue mechanism
* @throws QueueTimeoutException if the query timed out waiting to
* be admitted.
*/
void admit() throws QueueTimeoutException, QueryQueueException;
/**
* Returns the name of the queue (if any) on which the query was
* placed. Valid only after the query is admitted.
*
* @return queue name, or null if queuing is not enabled.
*/
String queueName();
/**
* Mark the query as completing, giving up its slot in the
* cluster. Releases any lease that may be held for a system with queues.
*/
void exit();
}
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