pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / backwards / src / test / org / apache / lucene / util / TestStringIntern.java

diff --git a/lucene-java-3.5.0/lucene/backwards/src/test/org/apache/lucene/util/TestStringIntern.java b/lucene-java-3.5.0/lucene/backwards/src/test/org/apache/lucene/util/TestStringIntern.java
new file mode 100755 (executable)
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+++ b/lucene-java-3.5.0/lucene/backwards/src/test/org/apache/lucene/util/TestStringIntern.java
@@ -0,0 +1,89 @@
+/**
+ * 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();
+    }
+  }
+}