org.apache.hadoop.hive.ql.io.IOPrepareCache Maven / Gradle / Ivy
/**
* 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.hadoop.hive.ql.io;
import java.util.HashMap;
import java.util.Map;
import org.apache.hadoop.hive.ql.plan.PartitionDesc;
/**
* IOPrepareCache is used to cache pre-query io-related objects.
* It should be cleared every time a new query issued.
*
*/
public class IOPrepareCache {
private static ThreadLocal threadLocalIOPrepareCache = new ThreadLocal();
public static IOPrepareCache get() {
IOPrepareCache cache = IOPrepareCache.threadLocalIOPrepareCache.get();
if (cache == null) {
threadLocalIOPrepareCache.set(new IOPrepareCache());
cache = IOPrepareCache.threadLocalIOPrepareCache.get();
}
return cache;
}
public void clear() {
if(partitionDescMap != null) {
partitionDescMap.clear();
}
}
private Map, Map> partitionDescMap;
public Map, Map> allocatePartitionDescMap() {
if (partitionDescMap == null) {
partitionDescMap = new HashMap, Map>();
}
return partitionDescMap;
}
public Map, Map> getPartitionDescMap() {
return partitionDescMap;
}
public void setPartitionDescMap(
Map, Map> partitionDescMap) {
this.partitionDescMap = partitionDescMap;
}
}