| /* |
| * 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.io.util; |
| |
| import java.io.IOException; |
| import java.util.Arrays; |
| import java.util.Random; |
| |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| import sun.misc.VM; |
| |
| import static org.junit.Assert.assertEquals; |
| |
| public class SafeMemoryWriterTest |
| { |
| Random rand = new Random(); |
| static final int CHUNK = 54321; |
| |
| @Test |
| public void testTrim() throws IOException |
| { |
| testSafeMemoryWriter(CHUNK * 5, CHUNK, 65536); |
| } |
| |
| @Test |
| public void testOver2GBuffer() throws IOException |
| { |
| // we want the last resize to happen at this size, so that calculateNewSize wants to expand by over 2G |
| long initialSize = (Integer.MAX_VALUE * 33L / 32) * 2; |
| // a little more than the value above |
| long testSize = initialSize * 33 / 32; |
| |
| // start with smaller initial size, but make sure it would grow to the required value above |
| while (initialSize * 2 / 3 > 1024L * 1024L * DataOutputBuffer.DOUBLING_THRESHOLD) |
| initialSize = initialSize * 2 / 3; |
| |
| if (VM.maxDirectMemory() * 2 / 3 < testSize) |
| { |
| testSize = VM.maxDirectMemory() * 2 / 3; |
| System.err.format("Insufficient direct memory for full test, reducing to: %,d %x\n", testSize, testSize); |
| } |
| |
| testSafeMemoryWriter(testSize, CHUNK, initialSize); |
| } |
| |
| public void testSafeMemoryWriter(long toSize, int chunkSize, long initialSize) throws IOException |
| { |
| byte[] data = new byte[chunkSize]; |
| rand.nextBytes(data); |
| try (SafeMemoryWriter writer = new SafeMemoryWriter(initialSize)) |
| { |
| |
| long l; |
| for (l = 0; l < toSize; l += data.length) |
| { |
| writer.write(data); |
| } |
| writer.trim(); |
| |
| try (SafeMemory written = writer.currentBuffer().sharedCopy()) |
| { |
| assertEquals(l, written.size); |
| |
| byte[] writtenBytes = new byte[chunkSize]; |
| for (l = 0; l < toSize; l += writtenBytes.length) |
| { |
| written.getBytes(l, writtenBytes, 0, writtenBytes.length); |
| Assert.assertTrue(Arrays.equals(data, writtenBytes)); // assertArrayEquals is too slow for this |
| } |
| } |
| } |
| } |
| } |