OPENNLP-1662: Wrap thread-safe classes in try-with resources in Eval …

…test (#705)

opennlp-tools/src/test/java/opennlp/tools/eval/MultiThreadedToolsEval.java

@@ -22,6 +22,7 @@
 
 import org.junit.jupiter.api.Test;
 
+import opennlp.tools.commons.ThreadSafe;
 import opennlp.tools.postag.POSModel;
 import opennlp.tools.postag.ThreadSafePOSTaggerME;
 import opennlp.tools.sentdetect.SentenceModel;
@@ -33,37 +34,37 @@
 /**
  * Test the reentrant tools implementations are really thread safe by running concurrently.
  * Replace the thread-safe versions with the non-safe versions to see this test case fail.
+ *
+ * @see ThreadSafe
  */
 public class MultiThreadedToolsEval extends AbstractEvalTest {
 
   @Test
   public void runMEToolsMultiThreaded() throws IOException, InterruptedException {
 
-    File sModelFile = new File(getOpennlpDataDir(), "models-sf/en-sent.bin");
+    File dataDir = getOpennlpDataDir();
+    File sModelFile = new File(dataDir, "models-sf/en-sent.bin");
+    File tModelFile = new File(dataDir, "models-sf/en-token.bin");
+    File pModelFile = new File(dataDir, "models-sf/en-pos-maxent.bin");
     SentenceModel sModel = new SentenceModel(sModelFile);
-    ThreadSafeSentenceDetectorME sentencer = new ThreadSafeSentenceDetectorME(sModel);
-
-    File tModelFile = new File(getOpennlpDataDir(), "models-sf/en-token.bin");
     TokenizerModel tModel = new TokenizerModel(tModelFile);
-    ThreadSafeTokenizerME tokenizer = new ThreadSafeTokenizerME(tModel);
-
-    File pModelFile = new File(getOpennlpDataDir(), "models-sf/en-pos-maxent.bin");
     POSModel pModel = new POSModel(pModelFile);
-    ThreadSafePOSTaggerME tagger = new ThreadSafePOSTaggerME(pModel);
 
-    final String text = "All human beings are born free and equal in dignity and rights. They " +
-        "are endowed with reason and conscience and should act towards one another in a " +
-        "spirit of brotherhood.";
+    try (ThreadSafeSentenceDetectorME sentencer = new ThreadSafeSentenceDetectorME(sModel);
+         ThreadSafeTokenizerME tokenizer = new ThreadSafeTokenizerME(tModel);
+         ThreadSafePOSTaggerME tagger = new ThreadSafePOSTaggerME(pModel)) {
 
-    // Run numThreads threads, each processing the sample text numRunsPerThread times.
-    final int numThreads = 8;
-    final int numRunsPerThread = 1000;
-    Thread[] threads = new Thread[numThreads];
+      final String text = "All human beings are born free and equal in dignity and rights. They " +
+              "are endowed with reason and conscience and should act towards one another in a " +
+              "spirit of brotherhood.";
 
-    for (int i = 0; i < 8; i++) {
-      threads[i] = new Thread(new Runnable() {
-        @Override
-        public void run() {
+      // Run numThreads threads, each processing the sample text numRunsPerThread times.
+      final int numThreads = 8;
+      final int numRunsPerThread = 1000;
+      Thread[] threads = new Thread[numThreads];
+
+      for (int i = 0; i < 8; i++) {
+        threads[i] = new Thread(() -> {
           for (int j = 0; j < numRunsPerThread; j++) {
             Span[] sentences = sentencer.sentPosDetect(text);
             for (Span span : sentences) {
@@ -72,19 +73,18 @@ public void run() {
               String[] tokenStrings = new String[tokens.length];
               for (int k = 0; k < tokens.length; k++) {
                 tokenStrings[k] = sentence.substring(tokens[k].getStart(),
-                    tokens[k].getEnd());
+                        tokens[k].getEnd());
               }
               String[] tags = tagger.tag(tokenStrings);
             }
           }
-        }
-      });
-      threads[i].start();
-    }
-    for (Thread t : threads) {
-      t.join();
+        });
+        threads[i].start();
+      }
+      for (Thread t : threads) {
+        t.join();
+      }
     }
-
   }
 
 }