improve the random handling in these tests

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1049144 13f79535-47bb-0310-9956-ffa450edef68

lucene/src/test/org/apache/lucene/index/TestIndexWriterExceptions.java

@@ -50,7 +50,7 @@ public class TestIndexWriterExceptions extends LuceneTestCase {
 
     IndexWriter writer;
 
-    final Random r = new java.util.Random(47);
+    final Random r = new Random(random.nextLong());
     volatile Throwable failure;
 
     public IndexerThread(int i, IndexWriter writer) {
@@ -128,7 +128,7 @@ public class TestIndexWriterExceptions extends LuceneTestCase {
   ThreadLocal<Thread> doFail = new ThreadLocal<Thread>();
 
   private class MockIndexWriter extends IndexWriter {
-    Random r = new java.util.Random(17);
+    Random r = new Random(random.nextLong());
 
     public MockIndexWriter(Directory dir, IndexWriterConfig conf) throws IOException {
       super(dir, conf);

lucene/src/test/org/apache/lucene/index/TestIndexWriterReader.java

@@ -837,10 +837,11 @@ public class TestIndexWriterReader extends LuceneTestCase {
     final Thread[] threads = new Thread[NUM_THREAD];
     for(int i=0;i<NUM_THREAD;i++) {
       threads[i] = new Thread() {
+          final Random r = new Random(random.nextLong());
+
           @Override
           public void run() {
             int count = 0;
-            final Random r = new Random();
             do {
               try {
                 for(int docUpto=0;docUpto<10;docUpto++) {

lucene/src/test/org/apache/lucene/index/TestNRTReaderWithThreads.java

@@ -26,7 +26,6 @@ import org.apache.lucene.store.Directory;
 import org.apache.lucene.util.LuceneTestCase;
 
 public class TestNRTReaderWithThreads extends LuceneTestCase {
-  Random random = new Random();
   AtomicInteger seq = new AtomicInteger(1);
 
   public void testIndexing() throws Exception {
@@ -77,6 +76,7 @@ public class TestNRTReaderWithThreads extends LuceneTestCase {
     int delCount = 0;
     int addCount = 0;
     int type;
+    final Random r = new Random(random.nextLong());
     
     public RunThread(int type, IndexWriter writer) {
       this.type = type;
@@ -97,7 +97,7 @@ public class TestNRTReaderWithThreads extends LuceneTestCase {
             // we may or may not delete because the term may not exist,
             // however we're opening and closing the reader rapidly
             IndexReader reader = writer.getReader();
-            int id = random.nextInt(seq.intValue());
+            int id = r.nextInt(seq.intValue());
             Term term = new Term("id", Integer.toString(id));
             int count = TestIndexWriterReader.count(term, reader);
             writer.deleteDocuments(term);

lucene/src/test/org/apache/lucene/index/TestPerSegmentDeletes.java

@@ -38,7 +38,7 @@ import org.apache.lucene.util.Version;
 public class TestPerSegmentDeletes extends LuceneTestCase {
   public void testDeletes1() throws Exception {
     //IndexWriter.debug2 = System.out;
-    Directory dir = new MockDirectoryWrapper(new Random(), new RAMDirectory());
+    Directory dir = new MockDirectoryWrapper(new Random(random.nextLong()), new RAMDirectory());
     IndexWriterConfig iwc = new IndexWriterConfig(Version.LUCENE_CURRENT,
         new MockAnalyzer());
     iwc.setMergeScheduler(new SerialMergeScheduler());

lucene/src/test/org/apache/lucene/util/TestSetOnce.java

@@ -29,6 +29,11 @@ public class TestSetOnce extends LuceneTestCase {
   private static final class SetOnceThread extends Thread {
     SetOnce<Integer> set;
     boolean success = false;
+    final Random RAND;
+    
+    public SetOnceThread(Random random) {
+      RAND = new Random(random.nextLong());
+    }
     
     @Override
     public void run() {
@@ -46,8 +51,6 @@ public class TestSetOnce extends LuceneTestCase {
     }
   }
   
-  private static final Random RAND = new Random();
-  
   @Test
   public void testEmptyCtor() throws Exception {
     SetOnce<Integer> set = new SetOnce<Integer>();
@@ -71,15 +74,10 @@ public class TestSetOnce extends LuceneTestCase {
   
   @Test
   public void testSetMultiThreaded() throws Exception {
-    long seed = RAND.nextLong();
-    RAND.setSeed(seed);
-    if (VERBOSE) {
-      System.out.println("testSetMultiThreaded: seed=" + seed);
-    }
     final SetOnce<Integer> set = new SetOnce<Integer>();
     SetOnceThread[] threads = new SetOnceThread[10];
     for (int i = 0; i < threads.length; i++) {
-      threads[i] = new SetOnceThread();
+      threads[i] = new SetOnceThread(random);
       threads[i].setName("t-" + (i+1));
       threads[i].set = set;
     }