+++ /dev/null
-/**
- * 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.lucene.util;
-import java.util.Random;
-
-public class TestStringIntern extends LuceneTestCase {
- String[] testStrings;
- String[] internedStrings;
-
- private String randStr(int len) {
- char[] arr = new char[len];
- for (int i=0; i<len; i++) {
- arr[i] = (char)('a' + random.nextInt(26));
- }
- return new String(arr);
- }
-
- private void makeStrings(int sz) {
- testStrings = new String[sz];
- internedStrings = new String[sz];
- for (int i=0; i<sz; i++) {
- testStrings[i] = randStr(random.nextInt(8)+3);
- }
- }
-
- public void testStringIntern() throws InterruptedException {
- makeStrings(1024*10); // something greater than the capacity of the default cache size
- // makeStrings(100); // realistic for perf testing
- int nThreads = 20;
- // final int iter=100000;
- final int iter = atLeast(100000);
-
- // try native intern
- // StringHelper.interner = new StringInterner();
-
- Thread[] threads = new Thread[nThreads];
- for (int i=0; i<nThreads; i++) {
- final int seed = i;
- threads[i] = new Thread() {
- @Override
- public void run() {
- Random rand = new Random(seed);
- String[] myInterned = new String[testStrings.length];
- for (int j=0; j<iter; j++) {
- int idx = rand.nextInt(testStrings.length);
- String s = testStrings[idx];
- if (rand.nextBoolean()) s = new String(s); // make a copy half of the time
- String interned = StringHelper.intern(s);
- String prevInterned = myInterned[idx];
- String otherInterned = internedStrings[idx];
-
- // test against other threads
- if (otherInterned != null && otherInterned != interned) {
- fail();
- }
- internedStrings[idx] = interned;
-
- // test against local copy
- if (prevInterned != null && prevInterned != interned) {
- fail();
- }
- myInterned[idx] = interned;
- }
- }
- };
-
- threads[i].start();
- }
-
- for (int i=0; i<nThreads; i++) {
- threads[i].join();
- }
- }
-}