spark MemoryLocation 源码
spark MemoryLocation 代码
文件路径：/common/unsafe/src/main/java/org/apache/spark/unsafe/memory/MemoryLocation.java
/*
* 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.spark.unsafe.memory;
import javax.annotation.Nullable;
/**
* A memory location. Tracked either by a memory address (with off-heap allocation),
* or by an offset from a JVM object (on-heap allocation).
*/
public class MemoryLocation {
@Nullable
Object obj;
long offset;
public MemoryLocation(@Nullable Object obj, long offset) {
this.obj = obj;
this.offset = offset;
}
public MemoryLocation() {
this(null, 0);
}
public void setObjAndOffset(Object newObj, long newOffset) {
this.obj = newObj;
this.offset = newOffset;
}
public final Object getBaseObject() {
return obj;
}
public final long getBaseOffset() {
return offset;
}
}
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