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1 | /* |
2 | * Licensed to the Apache Software Foundation (ASF) under one or more | |
3 | * contributor license agreements. See the NOTICE file distributed with | |
4 | * this work for additional information regarding copyright ownership. | |
5 | * The ASF licenses this file to You under the Apache License, Version 2.0 | |
6 | * (the "License"); you may not use this file except in compliance with | |
7 | * the License. You may obtain a copy of the License at | |
8 | * | |
9 | * http://www.apache.org/licenses/LICENSE-2.0 | |
10 | * | |
11 | * Unless required by applicable law or agreed to in writing, software | |
12 | * distributed under the License is distributed on an "AS IS" BASIS, | |
13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
14 | * See the License for the specific language governing permissions and | |
15 | * limitations under the License. | |
16 | */ | |
17 | ||
18 | package org.apache.arrow.memory; | |
19 | ||
20 | import static org.junit.Assert.assertEquals; | |
21 | ||
22 | import org.junit.AfterClass; | |
23 | import org.junit.BeforeClass; | |
24 | import org.junit.Test; | |
25 | ||
26 | import io.netty.buffer.PooledByteBufAllocatorL; | |
27 | ||
28 | public class TestEmptyArrowBuf { | |
29 | ||
30 | private static final int MAX_ALLOCATION = 8 * 1024; | |
31 | private static RootAllocator allocator; | |
32 | ||
33 | @BeforeClass | |
34 | public static void beforeClass() { | |
35 | allocator = new RootAllocator(MAX_ALLOCATION); | |
36 | } | |
37 | ||
38 | /** Ensure the allocator is closed. */ | |
39 | @AfterClass | |
40 | public static void afterClass() { | |
41 | if (allocator != null) { | |
42 | allocator.close(); | |
43 | } | |
44 | } | |
45 | ||
46 | @Test | |
47 | public void testZeroBuf() { | |
48 | // Exercise the historical log inside the empty ArrowBuf. This is initialized statically, and there is a circular | |
49 | // dependency between ArrowBuf and BaseAllocator, so if the initialization happens in the wrong order, the | |
50 | // historical log will be null even though BaseAllocator.DEBUG is true. | |
51 | allocator.getEmpty().print(new StringBuilder(), 0, BaseAllocator.Verbosity.LOG_WITH_STACKTRACE); | |
52 | } | |
53 | ||
54 | @Test | |
55 | public void testEmptyArrowBuf() { | |
56 | ArrowBuf buf = new ArrowBuf(ReferenceManager.NO_OP, null, | |
57 | 1024, new PooledByteBufAllocatorL().empty.memoryAddress()); | |
58 | ||
59 | buf.getReferenceManager().retain(); | |
60 | buf.getReferenceManager().retain(8); | |
61 | assertEquals(1024, buf.capacity()); | |
62 | assertEquals(1, buf.getReferenceManager().getRefCount()); | |
63 | assertEquals(0, buf.getActualMemoryConsumed()); | |
64 | ||
65 | for (int i = 0; i < 10; i++) { | |
66 | buf.setByte(i, i); | |
67 | } | |
68 | assertEquals(0, buf.getActualMemoryConsumed()); | |
69 | assertEquals(0, buf.getReferenceManager().getSize()); | |
70 | assertEquals(0, buf.getReferenceManager().getAccountedSize()); | |
71 | assertEquals(false, buf.getReferenceManager().release()); | |
72 | assertEquals(false, buf.getReferenceManager().release(2)); | |
73 | assertEquals(0, buf.getReferenceManager().getAllocator().getLimit()); | |
74 | assertEquals(buf, buf.getReferenceManager().transferOwnership(buf, allocator).getTransferredBuffer()); | |
75 | assertEquals(0, buf.readerIndex()); | |
76 | assertEquals(0, buf.writerIndex()); | |
77 | assertEquals(1, buf.refCnt()); | |
78 | ||
79 | ArrowBuf derive = buf.getReferenceManager().deriveBuffer(buf, 0, 100); | |
80 | assertEquals(derive, buf); | |
81 | assertEquals(1, buf.refCnt()); | |
82 | assertEquals(1, derive.refCnt()); | |
83 | ||
84 | buf.close(); | |
85 | ||
86 | } | |
87 | ||
88 | } |