Github user keith-turner commented on a diff in the pull request:
https://github.com/apache/accumulo/pull/106#discussion_r65429962
--- Diff:
core/src/test/java/org/apache/accumulo/core/file/rfile/bcfile/CompressionTest.java
---
@@ -0,0 +1,126 @@
+/*
+ * 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.accumulo.core.file.rfile.bcfile;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.HashSet;
+
+import org.apache.accumulo.core.file.rfile.bcfile.Compression.Algorithm;
+import org.apache.hadoop.io.compress.CompressionCodec;
+import org.junit.Assert;
+import org.junit.Test;
+
+import com.google.common.collect.Lists;
+import com.google.common.collect.Sets;
+
+public class CompressionTest {
+
+ @Test
+ public void testSingle() throws IOException {
+ Assert.assertNotNull(Compression.Algorithm.GZ.getCodec());
+
+ Assert.assertNotNull(Compression.Algorithm.GZ.getCodec());
+ }
+
+ @Test
+ public void testManyStartNotNull() throws IOException {
+ final CompressionCodec codec = Algorithm.GZ.getCodec();
+
+ Assert.assertNotNull(codec);
+
+ ExecutorService service = Executors.newFixedThreadPool(10);
+
+ for (int i = 0; i < 30; i++) {
+ service.submit(new Callable<Boolean>()
+
+ {
+
+ @Override
+ public Boolean call() throws Exception {
+ Assert.assertNotNull(Compression.Algorithm.GZ.getCodec());
+ return true;
+ }
+
+ });
+ }
+
+ service.shutdown();
+
+ Assert.assertNotNull(codec);
+
+ }
+
+ // don't start until we have created the codec
+ @Test
+ public void testManyDontStartUntilThread() throws IOException {
+
+ ExecutorService service = Executors.newFixedThreadPool(10);
+
+ for (int i = 0; i < 30; i++) {
+
+ service.submit(new Callable<Boolean>() {
+
+ @Override
+ public Boolean call() throws Exception {
+ Assert.assertNotNull(Compression.Algorithm.GZ.getCodec());
+ return true;
+ }
+
+ });
+ }
+
+ service.shutdown();
+
+ }
+
+ // don't start until we have created the codec
+ @Test
+ public void testThereCanBeOnlyOne() throws IOException,
InterruptedException {
+
+ ExecutorService service = Executors.newFixedThreadPool(20);
+
+ ArrayList<Callable<Boolean>> list = Lists.newArrayList();
+
+ // keep track of the system's identity hashcodes.
+ final HashSet<Integer> testSet = Sets.newHashSet();
+
+ for (int i = 0; i < 40; i++) {
+ list.add(new Callable<Boolean>() {
+
+ @Override
+ public Boolean call() throws Exception {
+ CompressionCodec codec = Compression.Algorithm.GZ.getCodec();
--- End diff --
Instead of (or maybe in addition to, not sure)... would it make sense to
call `createDecompressionStream(...)` here and after invoking all check the
size of the codec cache? would have to make the codec cache visible for
testing...
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