FileSystemReceptionHandler: Fix sonar issues

Fixed 6 code smell issues reported by sonar.

Change-Id: I537df24f0f0624470efd8675f01ecd433aed1cb0
Issue-ID: POLICY-1256
Signed-off-by: Lianhao Lu <lianhao.lu@intel.com>
(cherry picked from commit 3c0823e37b6cf933b23687a2d7339b131fe5a464)

3 files changed, 82 insertions, 46 deletions

diff --git a/plugins/reception-plugins/src/main/java/org/onap/policy/distribution/reception/handling/sdc/FileSystemReceptionHandler.java b/plugins/reception-plugins/src/main/java/org/onap/policy/distribution/reception/handling/sdc/FileSystemReceptionHandler.java
index b1a95fac..db0b0b7b 100644
--- a/plugins/reception-plugins/src/main/java/org/onap/policy/distribution/reception/handling/sdc/FileSystemReceptionHandler.java
+++ b/plugins/reception-plugins/src/main/java/org/onap/policy/distribution/reception/handling/sdc/FileSystemReceptionHandler.java
@@ -43,7 +43,7 @@ import org.onap.policy.distribution.reception.handling.AbstractReceptionHandler;
  * Handles reception of inputs from File System which can be used to decode policies.
  */
 public class FileSystemReceptionHandler extends AbstractReceptionHandler {
-    private boolean running = true;
+    private boolean running = false;
     private static final Logger LOGGER = FlexLogger.getLogger(FileSystemReceptionHandler.class);
 
     @Override
@@ -56,6 +56,7 @@ public class FileSystemReceptionHandler extends AbstractReceptionHandler {
         } catch (final Exception ex) {
             LOGGER.error(ex);
         }
+        running = false;
         LOGGER.debug("FileSystemReceptionHandler main loop exited...");
     }
 
@@ -65,53 +66,57 @@ public class FileSystemReceptionHandler extends AbstractReceptionHandler {
         running = false;
     }
 
+    public boolean isRunning() {
+        return running;
+    }
+
     /**
      * Main entry point.
      * 
      * @param watchPath Path to watch
      */
     @SuppressWarnings("unchecked")
-    public void main(String watchPath) {
+    public void main(String watchPath) throws IOException {
         try (final WatchService watcher = FileSystems.getDefault().newWatchService()) {
             final Path dir = Paths.get(watchPath);
-
             dir.register(watcher, ENTRY_CREATE);
             LOGGER.debug("Watch Service registered for dir: " + dir.getFileName());
-            while (running) {
-                WatchKey key;
-                try {
-                    key = watcher.take();
-                } catch (final InterruptedException ex) {
-                    LOGGER.debug(ex);
-                    Thread.currentThread().interrupt();
-                    return;
-                }
+            startMainLoop(watcher, dir);
+        } catch (final InterruptedException ex) {
+            LOGGER.debug(ex);
+            Thread.currentThread().interrupt();
+        }
+    }
 
-                for (final WatchEvent<?> event : key.pollEvents()) {
-                    final WatchEvent.Kind<?> kind = event.kind();
-                    final WatchEvent<Path> ev = (WatchEvent<Path>) event;
-                    final Path fileName = ev.context();
-                    try {
-                        LOGGER.debug("new CSAR found: " + kind.name() + ": " + fileName);
-                        createPolicyInputAndCallHandler(dir.toString() + File.separator + fileName.toString());
-                        LOGGER.debug("CSAR complete: " + kind.name() + ": " + fileName);
-                    } catch (final PolicyDecodingException ex) {
-                        LOGGER.error(ex);
-                    }
-                }
-                final boolean valid = key.reset();
-                if (!valid) {
-                    LOGGER.error("Watch key no longer valid!");
-                    break;
-                }
+    @SuppressWarnings("unchecked")
+    protected void startMainLoop(WatchService watcher, Path dir) throws InterruptedException {
+        WatchKey key;
+        running = true;
+        while (running) {
+            key = watcher.take();
+
+            for (final WatchEvent<?> event : key.pollEvents()) {
+                final WatchEvent.Kind<?> kind = event.kind();
+                final WatchEvent<Path> ev = (WatchEvent<Path>) event;
+                final Path fileName = ev.context();
+                LOGGER.debug("new CSAR found: " + fileName);
+                createPolicyInputAndCallHandler(dir.toString() + File.separator + fileName.toString());
+                LOGGER.debug("CSAR complete: " + fileName);
+            }
+            final boolean valid = key.reset();
+            if (!valid) {
+                LOGGER.error("Watch key no longer valid!");
+                break;
             }
-        } catch (final IOException ex) {
-            LOGGER.error(ex);
         }
     }
 
-    protected void createPolicyInputAndCallHandler(final String fileName) throws PolicyDecodingException {
-        final Csar csarObject = new Csar(fileName);
-        inputReceived(csarObject);
+    protected void createPolicyInputAndCallHandler(final String fileName) {
+        try {
+            final Csar csarObject = new Csar(fileName);
+            inputReceived(csarObject);
+        } catch (final PolicyDecodingException ex) {
+            LOGGER.error(ex);
+        }
     }
 }
diff --git a/plugins/reception-plugins/src/main/java/org/onap/policy/distribution/reception/handling/sdc/FileSystemReceptionHandlerConfigurationParameterBuilder.java b/plugins/reception-plugins/src/main/java/org/onap/policy/distribution/reception/handling/sdc/FileSystemReceptionHandlerConfigurationParameterBuilder.java
index b017cae6..37a16980 100644
--- a/plugins/reception-plugins/src/main/java/org/onap/policy/distribution/reception/handling/sdc/FileSystemReceptionHandlerConfigurationParameterBuilder.java
+++ b/plugins/reception-plugins/src/main/java/org/onap/policy/distribution/reception/handling/sdc/FileSystemReceptionHandlerConfigurationParameterBuilder.java
@@ -20,8 +20,6 @@
 
 package org.onap.policy.distribution.reception.handling.sdc;
 
-import java.util.List;
-
 /**
  * This class builds an instance of {@link FileSystemReceptionHandlerConfigurationParameterGroup} class.
  *
diff --git a/plugins/reception-plugins/src/test/java/org/onap/policy/distribution/reception/handling/sdc/TestFileSystemReceptionHandler.java b/plugins/reception-plugins/src/test/java/org/onap/policy/distribution/reception/handling/sdc/TestFileSystemReceptionHandler.java
index 8edca74e..29eb3f7e 100644
--- a/plugins/reception-plugins/src/test/java/org/onap/policy/distribution/reception/handling/sdc/TestFileSystemReceptionHandler.java
+++ b/plugins/reception-plugins/src/test/java/org/onap/policy/distribution/reception/handling/sdc/TestFileSystemReceptionHandler.java
@@ -29,6 +29,7 @@ import java.io.File;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Paths;
+import java.util.concurrent.atomic.AtomicInteger;
 
 import org.junit.After;
 import org.junit.Before;
@@ -38,7 +39,9 @@ import org.junit.rules.TemporaryFolder;
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.Mockito;
+import org.mockito.invocation.InvocationOnMock;
 import org.mockito.runners.MockitoJUnitRunner;
+import org.mockito.stubbing.Answer;
 import org.onap.policy.common.logging.flexlogger.FlexLogger;
 import org.onap.policy.common.logging.flexlogger.Logger;
 import org.onap.policy.common.parameters.ParameterService;
@@ -89,9 +92,9 @@ public class TestFileSystemReceptionHandler {
     public void teardown() {
         ParameterService.deregister(pssdConfigParameters);
     }
-    
+
     @Test
-    public final void testInit() {
+    public final void testInit() throws IOException {
         final FileSystemReceptionHandler sypHandler = Mockito.spy(fileSystemHandler);
         Mockito.doNothing().when(sypHandler).main(Mockito.isA(String.class));
         sypHandler.initializeReception(pssdConfigParameters.getName());
@@ -99,7 +102,7 @@ public class TestFileSystemReceptionHandler {
     }
 
     @Test
-    public final void testDestroy() {
+    public final void testDestroy() throws IOException {
         try {
             final FileSystemReceptionHandler sypHandler = Mockito.spy(fileSystemHandler);
             Mockito.doNothing().when(sypHandler).main(Mockito.isA(String.class));
@@ -114,23 +117,53 @@ public class TestFileSystemReceptionHandler {
 
     @Test
     public void testMain() throws IOException, PolicyDecodingException {
+        final Object lock = new Object();
+        final String watchPath = tempFolder.getRoot().getAbsolutePath().toString();
+
+        class Processed {
+            public boolean processed = false;
+        }
+
+        Processed cond = new Processed();
 
         final FileSystemReceptionHandler sypHandler = Mockito.spy(fileSystemHandler);
-        Mockito.doNothing().when(sypHandler).createPolicyInputAndCallHandler(Mockito.isA(String.class));
+        Mockito.doAnswer(new Answer() {
+            public Object answer(InvocationOnMock invocation) {
+                synchronized (lock) {
+                    cond.processed = true;
+                    lock.notifyAll();
+                }
+                return null;
+            }
+        }).when(sypHandler).createPolicyInputAndCallHandler(Mockito.isA(String.class));
 
-        final String watchPath = tempFolder.getRoot().getAbsolutePath().toString();
         Thread th = new Thread(() -> {
-            sypHandler.main(watchPath);
+            try {
+                sypHandler.main(watchPath);
+            } catch (IOException ex) {
+                LOGGER.error(ex);
+            }
         });
 
         th.start();
         try {
-            // yield to main thread
-            Thread.sleep(1000);
+            //wait until internal watch service started or counter reached
+            AtomicInteger counter = new AtomicInteger();
+            counter.set(0);
+            synchronized (lock) {
+                while (!sypHandler.isRunning() && counter.getAndIncrement() < 10) {
+                    lock.wait(1000);
+                }
+            }
             Files.copy(Paths.get("src/test/resources/hpaPolicyHugePage.csar"),
                 Paths.get(watchPath + File.separator + "hpaPolicyHugePage.csar"));
-            // wait enough time 
-            Thread.sleep(1000);
+            //wait until mock method triggered or counter reached
+            counter.set(0);
+            synchronized (lock) {
+                while (!cond.processed && counter.getAndIncrement() < 10) {
+                    lock.wait(1000);
+                }
+            }
             sypHandler.destroy();
             th.interrupt();
             th.join();