| /* |
| * 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.cassandra.db; |
| |
| import java.io.File; |
| import java.io.RandomAccessFile; |
| import java.lang.management.ManagementFactory; |
| import java.nio.MappedByteBuffer; |
| import java.nio.channels.FileChannel; |
| import java.nio.file.StandardOpenOption; |
| import javax.management.MBeanServer; |
| import javax.management.ObjectName; |
| |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| import org.apache.cassandra.io.util.FileUtils; |
| |
| public class MmapFileTest |
| { |
| /** |
| * Verifies that {@link sun.misc.Cleaner} works and that mmap'd files can be deleted. |
| */ |
| @Test |
| public void testMmapFile() throws Exception |
| { |
| ObjectName bpmName = new ObjectName("java.nio:type=BufferPool,name=mapped"); |
| |
| MBeanServer mbs = ManagementFactory.getPlatformMBeanServer(); |
| Long mmapCount = (Long) mbs.getAttribute(bpmName, "Count"); |
| Long mmapMemoryUsed = (Long) mbs.getAttribute(bpmName, "MemoryUsed"); |
| |
| Assert.assertEquals("# of mapped buffers should be 0", Long.valueOf(0L), mmapCount); |
| Assert.assertEquals("amount of mapped memory should be 0", Long.valueOf(0L), mmapMemoryUsed); |
| |
| File f1 = FileUtils.createTempFile("MmapFileTest1", ".bin"); |
| File f2 = FileUtils.createTempFile("MmapFileTest2", ".bin"); |
| File f3 = FileUtils.createTempFile("MmapFileTest2", ".bin"); |
| |
| try |
| { |
| int size = 1024 * 1024; |
| |
| try (RandomAccessFile raf = new RandomAccessFile(f1, "rw")) |
| { |
| raf.setLength(size); |
| } |
| |
| try (RandomAccessFile raf = new RandomAccessFile(f2, "rw")) |
| { |
| raf.setLength(size); |
| } |
| |
| try (RandomAccessFile raf = new RandomAccessFile(f3, "rw")) |
| { |
| raf.setLength(size); |
| } |
| |
| try (FileChannel channel = FileChannel.open(f1.toPath(), StandardOpenOption.WRITE, StandardOpenOption.READ)) |
| { |
| MappedByteBuffer buffer = channel.map(FileChannel.MapMode.READ_WRITE, 0, size); |
| |
| mmapCount = (Long) mbs.getAttribute(bpmName, "Count"); |
| mmapMemoryUsed = (Long) mbs.getAttribute(bpmName, "MemoryUsed"); |
| Assert.assertEquals("mapped buffers don't work?", Long.valueOf(1L), mmapCount); |
| Assert.assertTrue("mapped buffers don't work?", mmapMemoryUsed >= size); |
| |
| Assert.assertTrue(buffer.isDirect()); |
| |
| buffer.putInt(42); |
| buffer.putInt(42); |
| buffer.putInt(42); |
| buffer.putInt(42); |
| buffer.putInt(42); |
| |
| FileUtils.clean(buffer); |
| } |
| |
| mmapCount = (Long) mbs.getAttribute(bpmName, "Count"); |
| mmapMemoryUsed = (Long) mbs.getAttribute(bpmName, "MemoryUsed"); |
| Assert.assertEquals("# of mapped buffers should be 0", Long.valueOf(0L), mmapCount); |
| Assert.assertEquals("amount of mapped memory should be 0", Long.valueOf(0L), mmapMemoryUsed); |
| |
| try (FileChannel channel = FileChannel.open(f2.toPath(), StandardOpenOption.WRITE, StandardOpenOption.READ)) |
| { |
| MappedByteBuffer buffer = channel.map(FileChannel.MapMode.READ_WRITE, 0, size); |
| |
| // # of mapped buffers is == 1 here - seems that previous direct buffer for 'f1' is deallocated now |
| |
| mmapCount = (Long) mbs.getAttribute(bpmName, "Count"); |
| mmapMemoryUsed = (Long) mbs.getAttribute(bpmName, "MemoryUsed"); |
| Assert.assertEquals("mapped buffers don't work?", Long.valueOf(1L), mmapCount); |
| Assert.assertTrue("mapped buffers don't work?", mmapMemoryUsed >= size); |
| |
| Assert.assertTrue(buffer.isDirect()); |
| |
| buffer.putInt(42); |
| buffer.putInt(42); |
| buffer.putInt(42); |
| buffer.putInt(42); |
| buffer.putInt(42); |
| |
| FileUtils.clean(buffer); |
| } |
| |
| mmapCount = (Long) mbs.getAttribute(bpmName, "Count"); |
| mmapMemoryUsed = (Long) mbs.getAttribute(bpmName, "MemoryUsed"); |
| Assert.assertEquals("# of mapped buffers should be 0", Long.valueOf(0L), mmapCount); |
| Assert.assertEquals("amount of mapped memory should be 0", Long.valueOf(0L), mmapMemoryUsed); |
| |
| try (FileChannel channel = FileChannel.open(f3.toPath(), StandardOpenOption.WRITE, StandardOpenOption.READ)) |
| { |
| MappedByteBuffer buffer = channel.map(FileChannel.MapMode.READ_WRITE, 0, size); |
| |
| mmapCount = (Long) mbs.getAttribute(bpmName, "Count"); |
| mmapMemoryUsed = (Long) mbs.getAttribute(bpmName, "MemoryUsed"); |
| Assert.assertEquals("mapped buffers don't work?", Long.valueOf(1L), mmapCount); |
| Assert.assertTrue("mapped buffers don't work?", mmapMemoryUsed >= size); |
| |
| Assert.assertTrue(buffer.isDirect()); |
| |
| buffer.putInt(42); |
| buffer.putInt(42); |
| buffer.putInt(42); |
| buffer.putInt(42); |
| buffer.putInt(42); |
| |
| FileUtils.clean(buffer); |
| } |
| |
| mmapCount = (Long) mbs.getAttribute(bpmName, "Count"); |
| mmapMemoryUsed = (Long) mbs.getAttribute(bpmName, "MemoryUsed"); |
| Assert.assertEquals("# of mapped buffers should be 0", Long.valueOf(0L), mmapCount); |
| Assert.assertEquals("amount of mapped memory should be 0", Long.valueOf(0L), mmapMemoryUsed); |
| |
| Assert.assertTrue(f1.delete()); |
| Assert.assertTrue(f2.delete()); |
| Assert.assertTrue(f3.delete()); |
| } |
| finally |
| { |
| Runtime.getRuntime().gc(); |
| f1.delete(); |
| f2.delete(); |
| f3.delete(); |
| } |
| } |
| } |