Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/19222#discussion_r179332281
--- Diff:
common/unsafe/src/main/java/org/apache/spark/unsafe/memory/ByteArrayMemoryBlock.java
---
@@ -0,0 +1,127 @@
+/*
+ * 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 com.google.common.primitives.Ints;
+
+import org.apache.spark.unsafe.Platform;
+
+/**
+ * A consecutive block of memory with a byte array on Java heap.
+ */
+public final class ByteArrayMemoryBlock extends MemoryBlock {
+
+ private final byte[] array;
+
+ public ByteArrayMemoryBlock(byte[] obj, long offset, long size) {
+ super(obj, offset, size);
+ this.array = obj;
+ assert(offset + size <= Platform.BYTE_ARRAY_OFFSET + obj.length) :
+ "The sum of size " + size + " and offset " + offset + " should not
be larger than " +
+ "the array size " + (obj.length + Platform.BYTE_ARRAY_OFFSET);
+ }
+
+ public ByteArrayMemoryBlock(long length) {
+ this(new byte[Ints.checkedCast(length)], Platform.BYTE_ARRAY_OFFSET,
length);
+ }
+
+ @Override
+ public MemoryBlock subBlock(long offset, long size) {
+ checkSubBlockRange(offset, size);
+ return new ByteArrayMemoryBlock(array, this.offset + offset, size);
+ }
+
+ public byte[] getByteArray() { return array; }
+
+ /**
+ * Creates a memory block pointing to the memory used by the byte array.
+ */
+ public static ByteArrayMemoryBlock fromArray(final byte[] array) {
+ return new ByteArrayMemoryBlock(array, Platform.BYTE_ARRAY_OFFSET,
array.length);
+ }
+
+ @Override
+ public final int getInt(long offset) {
+ return Platform.getInt(array, this.offset + offset);
+ }
+
+ @Override
+ public final void putInt(long offset, int value) {
+ Platform.putInt(array, this.offset + offset, value);
+ }
+
+ @Override
+ public final boolean getBoolean(long offset) {
+ return Platform.getBoolean(array, this.offset + offset);
+ }
+
+ @Override
+ public final void putBoolean(long offset, boolean value) {
+ Platform.putBoolean(array, this.offset + offset, value);
+ }
+
+ @Override
+ public final byte getByte(long offset) {
+ return array[(int)(this.offset + offset - Platform.BYTE_ARRAY_OFFSET)];
+ }
+
+ @Override
+ public final void putByte(long offset, byte value) {
+ array[(int)(this.offset + offset - Platform.BYTE_ARRAY_OFFSET)] =
value;
--- End diff --
ditto
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