opendaylight/md-sal/sal-dom-broker/src/main/java/org/opendaylight/controller/md/sal/dom/broker/impl/PingPongTransaction.java

   1 /*
   2  * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.controller.md.sal.dom.broker.impl;
   9
  10 import com.google.common.base.MoreObjects;
  11 import com.google.common.base.MoreObjects.ToStringHelper;
  12 import com.google.common.base.Preconditions;
  13 import com.google.common.util.concurrent.CheckedFuture;
  14 import com.google.common.util.concurrent.FutureCallback;
  15 import com.google.common.util.concurrent.SettableFuture;
  16 import org.opendaylight.controller.md.sal.common.api.data.TransactionCommitFailedException;
  17 import org.opendaylight.controller.md.sal.dom.api.DOMDataReadWriteTransaction;
  18
  19 /**
  20  * Transaction context. Tracks the relationship with the backend transaction.
  21  * We never leak this class to the user and have it implement the {@link FutureCallback}
  22  * interface so we have a simple way of propagating the result.
  23  */
  24 final class PingPongTransaction implements FutureCallback<Void> {
  25     private final CheckedFuture<Void, TransactionCommitFailedException> submitFuture;
  26     private final DOMDataReadWriteTransaction delegate;
  27     private final SettableFuture<Void> future;
  28     private DOMDataReadWriteTransaction frontendTransaction;
  29
  30     PingPongTransaction(final DOMDataReadWriteTransaction delegate) {
  31         this.delegate = Preconditions.checkNotNull(delegate);
  32         future = SettableFuture.create();
  33         submitFuture = new PingPongFuture(future);
  34     }
  35
  36     DOMDataReadWriteTransaction getTransaction() {
  37         return delegate;
  38     }
  39
  40     DOMDataReadWriteTransaction getFrontendTransaction() {
  41         return frontendTransaction;
  42     }
  43
  44     CheckedFuture<Void, TransactionCommitFailedException> getSubmitFuture() {
  45         return submitFuture;
  46     }
  47
  48     @Override
  49     public void onSuccess(final Void result) {
  50         future.set(result);
  51     }
  52
  53     @Override
  54     public void onFailure(final Throwable throwable) {
  55         future.setException(throwable);
  56     }
  57
  58     void recordFrontendTransaction(final DOMDataReadWriteTransaction tx) {
  59         if (frontendTransaction != null) {
  60             frontendTransaction = tx;
  61         }
  62     }
  63
  64     @Override
  65     public String toString() {
  66         return addToStringAttributes(MoreObjects.toStringHelper(this)).toString();
  67     }
  68
  69     protected ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
  70         return toStringHelper.add("delegate", delegate);
  71     }
  72 }