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/*
* Copyright 2013 Google Inc.
*
* Licensed 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 com.google.common.jimfs;
import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.fail;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/**
* Tests for {@link HeapDisk}.
*
* @author Colin Decker
*/
@RunWith(JUnit4.class)
public class HeapDiskTest {
private RegularFile blocks;
@Before
public void setUp() {
// the HeapDisk of this file is unused; it's passed to other HeapDisks to test operations
blocks = RegularFile.create(-1, new HeapDisk(2, 2, 2));
}
@Test
public void testInitialSettings_basic() {
HeapDisk disk = new HeapDisk(8192, 100, 100);
assertThat(disk.blockSize()).isEqualTo(8192);
assertThat(disk.getTotalSpace()).isEqualTo(819200);
assertThat(disk.getUnallocatedSpace()).isEqualTo(819200);
assertThat(disk.blockCache.blockCount()).isEqualTo(0);
}
@Test
public void testInitialSettings_fromConfiguration() {
Configuration config =
Configuration.unix().toBuilder()
.setBlockSize(4)
.setMaxSize(99) // not a multiple of 4
.setMaxCacheSize(25)
.build();
HeapDisk disk = new HeapDisk(config);
assertThat(disk.blockSize()).isEqualTo(4);
assertThat(disk.getTotalSpace()).isEqualTo(96);
assertThat(disk.getUnallocatedSpace()).isEqualTo(96);
assertThat(disk.blockCache.blockCount()).isEqualTo(0);
}
@Test
public void testAllocate() throws IOException {
HeapDisk disk = new HeapDisk(4, 10, 0);
disk.allocate(blocks, 1);
assertThat(blocks.blockCount()).isEqualTo(1);
assertThat(blocks.getBlock(0).length).isEqualTo(4);
assertThat(disk.getUnallocatedSpace()).isEqualTo(36);
disk.allocate(blocks, 5);
assertThat(blocks.blockCount()).isEqualTo(6);
for (int i = 0; i < blocks.blockCount(); i++) {
assertThat(blocks.getBlock(i).length).isEqualTo(4);
}
assertThat(disk.getUnallocatedSpace()).isEqualTo(16);
assertThat(disk.blockCache.blockCount()).isEqualTo(0);
}
@Test
public void testFree_noCaching() throws IOException {
HeapDisk disk = new HeapDisk(4, 10, 0);
disk.allocate(blocks, 6);
disk.free(blocks, 2);
assertThat(blocks.blockCount()).isEqualTo(4);
assertThat(disk.getUnallocatedSpace()).isEqualTo(24);
assertThat(disk.blockCache.blockCount()).isEqualTo(0);
disk.free(blocks);
assertThat(blocks.blockCount()).isEqualTo(0);
assertThat(disk.getUnallocatedSpace()).isEqualTo(40);
assertThat(disk.blockCache.blockCount()).isEqualTo(0);
}
@Test
public void testFree_fullCaching() throws IOException {
HeapDisk disk = new HeapDisk(4, 10, 10);
disk.allocate(blocks, 6);
disk.free(blocks, 2);
assertThat(blocks.blockCount()).isEqualTo(4);
assertThat(disk.getUnallocatedSpace()).isEqualTo(24);
assertThat(disk.blockCache.blockCount()).isEqualTo(2);
disk.free(blocks);
assertThat(blocks.blockCount()).isEqualTo(0);
assertThat(disk.getUnallocatedSpace()).isEqualTo(40);
assertThat(disk.blockCache.blockCount()).isEqualTo(6);
}
@Test
public void testFree_partialCaching() throws IOException {
HeapDisk disk = new HeapDisk(4, 10, 4);
disk.allocate(blocks, 6);
disk.free(blocks, 2);
assertThat(blocks.blockCount()).isEqualTo(4);
assertThat(disk.getUnallocatedSpace()).isEqualTo(24);
assertThat(disk.blockCache.blockCount()).isEqualTo(2);
disk.free(blocks);
assertThat(blocks.blockCount()).isEqualTo(0);
assertThat(disk.getUnallocatedSpace()).isEqualTo(40);
assertThat(disk.blockCache.blockCount()).isEqualTo(4);
}
@Test
public void testAllocateFromCache_fullAllocationFromCache() throws IOException {
HeapDisk disk = new HeapDisk(4, 10, 10);
disk.allocate(blocks, 10);
assertThat(disk.getUnallocatedSpace()).isEqualTo(0);
disk.free(blocks);
assertThat(blocks.blockCount()).isEqualTo(0);
assertThat(disk.blockCache.blockCount()).isEqualTo(10);
List<byte[]> cachedBlocks = new ArrayList<>();
for (int i = 0; i < 10; i++) {
cachedBlocks.add(disk.blockCache.getBlock(i));
}
disk.allocate(blocks, 6);
assertThat(blocks.blockCount()).isEqualTo(6);
assertThat(disk.blockCache.blockCount()).isEqualTo(4);
// the 6 arrays in blocks are the last 6 arrays that were cached
for (int i = 0; i < 6; i++) {
assertThat(blocks.getBlock(i)).isEqualTo(cachedBlocks.get(i + 4));
}
}
@Test
public void testAllocateFromCache_partialAllocationFromCache() throws IOException {
HeapDisk disk = new HeapDisk(4, 10, 4);
disk.allocate(blocks, 10);
assertThat(disk.getUnallocatedSpace()).isEqualTo(0);
disk.free(blocks);
assertThat(blocks.blockCount()).isEqualTo(0);
assertThat(disk.blockCache.blockCount()).isEqualTo(4);
List<byte[]> cachedBlocks = new ArrayList<>();
for (int i = 0; i < 4; i++) {
cachedBlocks.add(disk.blockCache.getBlock(i));
}
disk.allocate(blocks, 6);
assertThat(blocks.blockCount()).isEqualTo(6);
assertThat(disk.blockCache.blockCount()).isEqualTo(0);
// the last 4 arrays in blocks are the 4 arrays that were cached
for (int i = 2; i < 6; i++) {
assertThat(blocks.getBlock(i)).isEqualTo(cachedBlocks.get(i - 2));
}
}
@Test
public void testFullDisk() throws IOException {
HeapDisk disk = new HeapDisk(4, 10, 4);
disk.allocate(blocks, 10);
try {
disk.allocate(blocks, 1);
fail();
} catch (IOException expected) {
}
}
@Test
public void testFullDisk_doesNotAllocatePartiallyWhenTooManyBlocksRequested() throws IOException {
HeapDisk disk = new HeapDisk(4, 10, 4);
disk.allocate(blocks, 6);
RegularFile blocks2 = RegularFile.create(-2, disk);
try {
disk.allocate(blocks2, 5);
fail();
} catch (IOException expected) {
}
assertThat(blocks2.blockCount()).isEqualTo(0);
}
}
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