Cleanup java.util.Optional references

[controller.git] / opendaylight / md-sal / sal-distributed-datastore / src / main / java / org / opendaylight / controller / cluster / datastore / FrontendTransaction.java

diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/FrontendTransaction.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/FrontendTransaction.java
index 6c7ae07a3cf890c8cba9db65eba9e3fec349a405..25cb174ea6a4085f4d767cf9ce62a85b61ae30ef 100644 (file)
--- a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/FrontendTransaction.java
+++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/FrontendTransaction.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016 Cisco Systems, Inc. and others.  All rights reserved.
+ * Copyright (c) 2016, 2017 Cisco Systems, Inc. and others.  All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
@@ -11,7 +11,7 @@ import com.google.common.base.MoreObjects;
 import com.google.common.base.Preconditions;
 import com.google.common.base.Verify;
 import java.util.ArrayDeque;
-import java.util.Iterator;
+import java.util.Optional;
 import java.util.Queue;
 import javax.annotation.Nullable;
 import javax.annotation.concurrent.NotThreadSafe;
@@ -70,10 +70,10 @@ abstract class FrontendTransaction implements Identifiable<TransactionIdentifier
         return history().persistenceId();
     }
 
-    final java.util.Optional<TransactionSuccess<?>> replaySequence(final long sequence) throws RequestException {
+    final Optional<TransactionSuccess<?>> replaySequence(final long sequence) throws RequestException {
         // Fast path check: if the requested sequence is the next request, bail early
         if (expectedSequence == sequence) {
-            return java.util.Optional.empty();
+            return Optional.empty();
         }
 
         // Check sequencing: we do not need to bother with future requests
@@ -95,23 +95,21 @@ abstract class FrontendTransaction implements Identifiable<TransactionIdentifier
         // machinery is asynchronous, hence a reply may be in the works and not available.
 
         long replaySequence = firstReplaySequence;
-        final Iterator<?> it = replayQueue.iterator();
-        while (it.hasNext()) {
-            final Object replay = it.next();
+        for (Object replay : replayQueue) {
             if (replaySequence == sequence) {
                 if (replay instanceof RequestException) {
                     throw (RequestException) replay;
                 }
 
                 Verify.verify(replay instanceof TransactionSuccess);
-                return java.util.Optional.of((TransactionSuccess<?>) replay);
+                return Optional.of((TransactionSuccess<?>) replay);
             }
 
             replaySequence++;
         }
 
         // Not found
-        return java.util.Optional.empty();
+        return Optional.empty();
     }
 
     final void purgeSequencesUpTo(final long sequence) {
@@ -122,14 +120,15 @@ abstract class FrontendTransaction implements Identifiable<TransactionIdentifier
 
     // Request order has already been checked by caller and replaySequence()
     @SuppressWarnings("checkstyle:IllegalCatch")
-    final @Nullable TransactionSuccess<?> handleRequest(final TransactionRequest<?> request,
-            final RequestEnvelope envelope, final long now) throws RequestException {
+    @Nullable
+    final TransactionSuccess<?> handleRequest(final TransactionRequest<?> request, final RequestEnvelope envelope,
+            final long now) throws RequestException {
         if (request instanceof IncrementTransactionSequenceRequest) {
             final IncrementTransactionSequenceRequest incr = (IncrementTransactionSequenceRequest) request;
             expectedSequence += incr.getIncrement();
 
-            return recordSuccess(incr.getSequence(), new IncrementTransactionSequenceSuccess(incr.getTarget(),
-                incr.getSequence()));
+            return recordSuccess(incr.getSequence(),
+                    new IncrementTransactionSequenceSuccess(incr.getTarget(), incr.getSequence()));
         }
 
         if (previousFailure != null) {
@@ -141,8 +140,10 @@ abstract class FrontendTransaction implements Identifiable<TransactionIdentifier
             return doHandleRequest(request, envelope, now);
         } catch (RuntimeException e) {
             /*
-             * The request failed to process, we should not attempt to ever apply it again. Furthermore we cannot
-             * accept any further requests from this connection, simply because the transaction state is undefined.
+             * The request failed to process, we should not attempt to ever
+             * apply it again. Furthermore we cannot accept any further requests
+             * from this connection, simply because the transaction state is
+             * undefined.
              */
             LOG.debug("{}: Request {} failed to process", persistenceId(), request, e);
             previousFailure = new RuntimeRequestException("Request " + request + " failed to process", e);
@@ -150,9 +151,12 @@ abstract class FrontendTransaction implements Identifiable<TransactionIdentifier
         }
     }
 
-    abstract @Nullable TransactionSuccess<?> doHandleRequest(TransactionRequest<?> request, RequestEnvelope envelope,
+    @Nullable
+    abstract TransactionSuccess<?> doHandleRequest(TransactionRequest<?> request, RequestEnvelope envelope,
             long now) throws RequestException;
 
+    abstract void retire();
+
     private void recordResponse(final long sequence, final Object response) {
         if (replayQueue.isEmpty()) {
             firstReplaySequence = sequence;
@@ -189,5 +193,4 @@ abstract class FrontendTransaction implements Identifiable<TransactionIdentifier
                 .add("lastPurgedSequence", lastPurgedSequence)
                 .toString();
     }
-
 }