com.facebook.presto.jdbc.internal.spi.resourceGroups.ResourceGroupConfigurationManager Maven / Gradle / Ivy
/*
* Licensed 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 com.facebook.presto.jdbc.internal.spi.resourceGroups;
import java.util.Optional;
/**
* The engine calls the {@link #match(SelectionCriteria)} method whenever a query is submitted,
* and receives a {@link com.facebook.presto.jdbc.internal.spi.resourceGroups.SelectionContext} in return which
* contains a fully-qualified {@link com.facebook.presto.jdbc.internal.spi.resourceGroups.ResourceGroupId},
* and a manager-specific data structure of type {@code C}.
*
* At a later time, the engine may decide to construct a resource group with that ID. To do so,
* it will walk the tree to find the right position for the group, and then create it. It also
* creates any necessary parent groups. Every time the engine creates a group it will
* immediately call the configure method with the original context, allowing the manager to
* set the required properties on the group.
*
* @param the type of the manager-specific data structure
*/
public interface ResourceGroupConfigurationManager
{
/**
* Implementations may retain a reference to the group, and re-configure it asynchronously.
* This method is called, once, when the group is created.
*/
void configure(ResourceGroup group, SelectionContext criteria);
/**
* This method is called for every query that is submitted, so it should be fast.
*/
Optional> match(SelectionCriteria criteria);
}