unsafe/memory/MemoryLocation.java

0001 /*
0002  * Licensed to the Apache Software Foundation (ASF) under one or more
0003  * contributor license agreements.  See the NOTICE file distributed with
0004  * this work for additional information regarding copyright ownership.
0005  * The ASF licenses this file to You under the Apache License, Version 2.0
0006  * (the "License"); you may not use this file except in compliance with
0007  * the License.  You may obtain a copy of the License at
0008  *
0009  *    http://www.apache.org/licenses/LICENSE-2.0
0010  *
0011  * Unless required by applicable law or agreed to in writing, software
0012  * distributed under the License is distributed on an "AS IS" BASIS,
0013  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
0014  * See the License for the specific language governing permissions and
0015  * limitations under the License.
0016  */
0017
0018 package org.apache.spark.unsafe.memory;
0019
0020 import javax.annotation.Nullable;
0021
0022 /**
0023  * A memory location. Tracked either by a memory address (with off-heap allocation),
0024  * or by an offset from a JVM object (on-heap allocation).
0025  */
0026 public class MemoryLocation {
0027
0028   @Nullable
0029   Object obj;
0030
0031   long offset;
0032
0033   public MemoryLocation(@Nullable Object obj, long offset) {
0034     this.obj = obj;
0035     this.offset = offset;
0036   }
0037
0038   public MemoryLocation() {
0039     this(null, 0);
0040   }
0041
0042   public void setObjAndOffset(Object newObj, long newOffset) {
0043     this.obj = newObj;
0044     this.offset = newOffset;
0045   }
0046
0047   public final Object getBaseObject() {
0048     return obj;
0049   }
0050
0051   public final long getBaseOffset() {
0052     return offset;
0053   }
0054 }