Add gradle plugin for google java format. Enforce all files to be formatted. (#771)

* Add gradle plugin for google java format. Enforce all files to be formatted.

* Fix javadoc comments.

* update to google-java-formatter 1.5

* Fix comments and run formatter only for java8.

* Formatter works only on java8.

3 files changed, 11 insertions, 13 deletions

diff --git a/impl/src/main/java/io/opencensus/impl/internal/DisruptorEventQueue.java b/impl/src/main/java/io/opencensus/impl/internal/DisruptorEventQueue.java
index f825d526..e11d6107 100644
--- a/impl/src/main/java/io/opencensus/impl/internal/DisruptorEventQueue.java
+++ b/impl/src/main/java/io/opencensus/impl/internal/DisruptorEventQueue.java
@@ -121,14 +121,15 @@ public final class DisruptorEventQueue implements EventQueue {
   }
 
   private static final AtomicInteger threadIdGen = new AtomicInteger();
-  private static final ThreadFactory threadFactory = new ThreadFactory() {
-      @Override
-      public Thread newThread(Runnable r) {
-        Thread thread = new Thread(r, "CensusDisruptor-" + threadIdGen.getAndIncrement());
-        thread.setDaemon(true);
-        return thread;
-      }
-    };
+  private static final ThreadFactory threadFactory =
+      new ThreadFactory() {
+        @Override
+        public Thread newThread(Runnable r) {
+          Thread thread = new Thread(r, "CensusDisruptor-" + threadIdGen.getAndIncrement());
+          thread.setDaemon(true);
+          return thread;
+        }
+      };
 
   // The single instance of the class.
   private static final DisruptorEventQueue eventQueue = new DisruptorEventQueue();
diff --git a/impl/src/main/java/io/opencensus/impl/trace/internal/ThreadLocalRandomHandler.java b/impl/src/main/java/io/opencensus/impl/trace/internal/ThreadLocalRandomHandler.java
index 1c6d6112..d13e3982 100644
--- a/impl/src/main/java/io/opencensus/impl/trace/internal/ThreadLocalRandomHandler.java
+++ b/impl/src/main/java/io/opencensus/impl/trace/internal/ThreadLocalRandomHandler.java
@@ -25,9 +25,7 @@ import javax.annotation.concurrent.ThreadSafe;
 @ThreadSafe
 public final class ThreadLocalRandomHandler extends RandomHandler {
 
-  /**
-   * Constructs a new {@code ThreadLocalRandomHandler}.
-   */
+  /** Constructs a new {@code ThreadLocalRandomHandler}. */
   public ThreadLocalRandomHandler() {}
 
   @Override
diff --git a/impl/src/test/java/io/opencensus/impl/trace/TracingTest.java b/impl/src/test/java/io/opencensus/impl/trace/TracingTest.java
index 5eef2c0d..e58ce1cb 100644
--- a/impl/src/test/java/io/opencensus/impl/trace/TracingTest.java
+++ b/impl/src/test/java/io/opencensus/impl/trace/TracingTest.java
@@ -38,8 +38,7 @@ public class TracingTest {
 
   @Test
   public void implementationOfBinaryPropagationHandler() {
-    assertThat(Tracing.getPropagationComponent())
-        .isInstanceOf(PropagationComponent.class);
+    assertThat(Tracing.getPropagationComponent()).isInstanceOf(PropagationComponent.class);
   }
 
   @Test