minor: StopWatch wrapper simplifying testing performance

SVN: 16341

openbis/source/java/ch/systemsx/cisd/openbis/generic/shared/util/StopWatchLogger.java

+/*
+ * Copyright 2010 ETH Zuerich, CISD
+ *
+ * Licensed 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 ch.systemsx.cisd.openbis.generic.shared.util;
+
+import org.apache.commons.lang.time.StopWatch;
+
+/**
+ * Wrapper over {@link StopWatch} making it more simple to debug performance.
+ * 
+ * @author Piotr Buczek
+ */
+public class StopWatchLogger
+{
+    public static StopWatchLogger create()
+    {
+        return new StopWatchLogger();
+    }
+
+    public static StopWatchLogger createAndStart()
+    {
+        StopWatchLogger result = create();
+        result.start();
+        return result;
+    }
+
+    private StopWatchLogger()
+    {
+    }
+
+    private StopWatch watch = new StopWatch();
+
+    private boolean started = false;
+
+    public void start()
+    {
+        started = true;
+        watch.start();
+    }
+
+    public void log(String method)
+    {
+        if (started == false)
+        {
+            start();
+        }
+        System.err.println(watch.toString() + " - " + method);
+    }
+
+}