Revamped ClusterCommunicationService API
Change-Id: I9326369de3d2413b0882b324979d10483c093de9
diff --git a/utils/misc/src/main/java/org/onlab/util/Tools.java b/utils/misc/src/main/java/org/onlab/util/Tools.java
index 01dda9e..62330fb 100644
--- a/utils/misc/src/main/java/org/onlab/util/Tools.java
+++ b/utils/misc/src/main/java/org/onlab/util/Tools.java
@@ -15,10 +15,10 @@
*/
package org.onlab.util;
-import com.google.common.base.Strings;
-import com.google.common.primitives.UnsignedLongs;
-import com.google.common.util.concurrent.ThreadFactoryBuilder;
-import org.slf4j.Logger;
+import static java.nio.file.Files.delete;
+import static java.nio.file.Files.walkFileTree;
+import static org.onlab.util.GroupedThreadFactory.groupedThreadFactory;
+import static org.slf4j.LoggerFactory.getLogger;
import java.io.BufferedReader;
import java.io.File;
@@ -37,12 +37,17 @@
import java.util.Collection;
import java.util.Dictionary;
import java.util.List;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
import java.util.concurrent.ThreadFactory;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
-import static java.nio.file.Files.delete;
-import static java.nio.file.Files.walkFileTree;
-import static org.onlab.util.GroupedThreadFactory.groupedThreadFactory;
-import static org.slf4j.LoggerFactory.getLogger;
+import org.slf4j.Logger;
+
+import com.google.common.base.Strings;
+import com.google.common.primitives.UnsignedLongs;
+import com.google.common.util.concurrent.ThreadFactoryBuilder;
/**
* Miscellaneous utility methods.
@@ -324,6 +329,51 @@
dst.getAbsolutePath()));
}
+ /**
+ * Returns the future value when complete or if future
+ * completes exceptionally returns the defaultValue.
+ * @param future future
+ * @param defaultValue default value
+ * @param <T> future value type
+ * @return future value when complete or if future
+ * completes exceptionally returns the defaultValue.
+ */
+ public static <T> T futureGetOrElse(Future<T> future, T defaultValue) {
+ try {
+ return future.get();
+ } catch (InterruptedException e) {
+ Thread.currentThread().interrupt();
+ return defaultValue;
+ } catch (ExecutionException e) {
+ return defaultValue;
+ }
+ }
+
+ /**
+ * Returns the future value when complete or if future
+ * completes exceptionally returns the defaultValue.
+ * @param future future
+ * @param timeout time to wait for successful completion
+ * @param timeUnit time unit
+ * @param defaultValue default value
+ * @param <T> future value type
+ * @return future value when complete or if future
+ * completes exceptionally returns the defaultValue.
+ */
+ public static <T> T futureGetOrElse(Future<T> future,
+ long timeout,
+ TimeUnit timeUnit,
+ T defaultValue) {
+ try {
+ return future.get(timeout, timeUnit);
+ } catch (InterruptedException e) {
+ Thread.currentThread().interrupt();
+ return defaultValue;
+ } catch (ExecutionException | TimeoutException e) {
+ return defaultValue;
+ }
+ }
+
// Auxiliary path visitor for recursive directory structure copying.
private static class DirectoryCopier extends SimpleFileVisitor<Path> {
private Path src;