| /** |
| * 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 com.datatorrent.lib.appdata.datastructs; |
| |
| import java.util.List; |
| |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| import com.google.common.collect.Lists; |
| |
| import com.datatorrent.lib.appdata.datastructs.CacheLRUSynchronousFlush.CacheFlushListener; |
| |
| public class CacheLRUSynchronousFlushTest |
| { |
| @Test |
| public void simplePutAndRemove() |
| { |
| final Integer key = 1; |
| final Integer value = 1; |
| |
| CacheLRUSynchronousFlush<Integer, Integer> cache = new CacheLRUSynchronousFlush<>( |
| new NOPCacheFlushListener<Integer, Integer>()); |
| |
| cache.put(key, value); |
| |
| Assert.assertEquals("The values should equal", value, cache.get(key)); |
| |
| Integer removedVal = cache.remove(key); |
| |
| Assert.assertEquals("The removed value must equal the old value", value, removedVal); |
| Assert.assertEquals("The retrieved value should be null.", null, cache.get(key)); |
| } |
| |
| @Test |
| public void simpleFlushChanges() |
| { |
| final Integer key = 1; |
| final Integer value = 1; |
| final Integer value2 = 2; |
| |
| TestFlushListener<Integer, Integer> fl = new TestFlushListener<Integer, Integer>(); |
| CacheLRUSynchronousFlush<Integer, Integer> cache = new CacheLRUSynchronousFlush<Integer, Integer>(fl); |
| |
| cache.put(key, value); |
| cache.flushChanges(); |
| |
| Assert.assertEquals("Expecting one key", 1, fl.flushedKeys.size()); |
| Assert.assertEquals("Expecting one value", 1, fl.flushedValues.size()); |
| |
| Assert.assertEquals("The keys must equal", key, fl.flushedKeys.get(0)); |
| Assert.assertEquals("The values must equal", value, fl.flushedValues.get(0)); |
| |
| fl.flushedKeys.clear(); |
| fl.flushedValues.clear(); |
| |
| cache.flushChanges(); |
| |
| Assert.assertEquals("Expecting no keys", 0, fl.flushedKeys.size()); |
| Assert.assertEquals("Expecting no values", 0, fl.flushedValues.size()); |
| |
| cache.put(1, value2); |
| |
| cache.flushChanges(); |
| |
| Assert.assertEquals("Expecting one key", 1, fl.flushedKeys.size()); |
| Assert.assertEquals("Expecting one value", 1, fl.flushedValues.size()); |
| |
| Assert.assertEquals("The keys must equal", key, fl.flushedKeys.get(0)); |
| Assert.assertEquals("The values must equal", value2, fl.flushedValues.get(0)); |
| } |
| |
| @Test |
| public void simpleRemoveExcessTest() |
| { |
| final Integer key = 1; |
| final Integer key2 = 2; |
| final Integer value = 1; |
| final Integer value2 = 2; |
| |
| int flushedSize = 1; |
| |
| TestFlushListener<Integer, Integer> fl = new TestFlushListener<Integer, Integer>(); |
| CacheLRUSynchronousFlush<Integer, Integer> cache = new CacheLRUSynchronousFlush<Integer, Integer>(flushedSize, fl); |
| |
| cache.put(key, value); |
| |
| try { |
| Thread.sleep(10); |
| } catch (InterruptedException ex) { |
| throw new RuntimeException(ex); |
| } |
| |
| cache.put(key2, value2); |
| |
| cache.removeExcess(); |
| |
| Assert.assertEquals("Expecting one key", 1, fl.flushedKeys.size()); |
| Assert.assertEquals("Expecting one value", 1, fl.flushedValues.size()); |
| |
| Assert.assertEquals("The keys must equal", key, fl.flushedKeys.get(0)); |
| Assert.assertEquals("The values must equal", value, fl.flushedValues.get(0)); |
| |
| Assert.assertEquals("This value should no longer be in the cache", null, cache.get(key)); |
| Assert.assertEquals("This value should still be in the cache", value2, cache.get(key2)); |
| |
| fl.flushedKeys.clear(); |
| fl.flushedValues.clear(); |
| |
| cache.flushChanges(); |
| |
| Assert.assertEquals("Expecting one key", 1, fl.flushedKeys.size()); |
| Assert.assertEquals("Expecting one value", 1, fl.flushedValues.size()); |
| |
| Assert.assertEquals("The keys must equal", key2, fl.flushedKeys.get(0)); |
| Assert.assertEquals("The values must equal", value2, fl.flushedValues.get(0)); |
| } |
| |
| public class TestFlushListener<KEY, VALUE> implements CacheFlushListener<KEY, VALUE> |
| { |
| public List<KEY> flushedKeys = Lists.newArrayList(); |
| public List<VALUE> flushedValues = Lists.newArrayList(); |
| |
| @Override |
| public void flush(KEY key, VALUE value) |
| { |
| flushedKeys.add(key); |
| flushedValues.add(value); |
| } |
| } |
| } |