dom/mdsal-dom-inmemory-datastore/src/main/java/org/opendaylight/mdsal/dom/store/inmemory/ShardCanCommitCoordinationTask.java

   1 /*
   2  * Copyright (c) 2016 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
   9 package org.opendaylight.mdsal.dom.store.inmemory;
  10
  11 import static java.util.Objects.requireNonNull;
  12
  13 import com.google.common.annotations.Beta;
  14 import com.google.common.util.concurrent.ListenableFuture;
  15 import java.util.Collection;
  16 import java.util.concurrent.Callable;
  17 import java.util.concurrent.ExecutionException;
  18 import org.opendaylight.mdsal.common.api.TransactionCommitFailedException;
  19 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
  20 import org.opendaylight.mdsal.dom.spi.store.DOMStoreThreePhaseCommitCohort;
  21 import org.slf4j.Logger;
  22 import org.slf4j.LoggerFactory;
  23
  24 /**
  25  * Task that coordinates the CanCommit phase of the provided {@link DOMStoreThreePhaseCommitCohort}'s.
  26  */
  27 @Beta
  28 public class ShardCanCommitCoordinationTask implements Callable<Boolean> {
  29
  30     private static final Logger LOG = LoggerFactory.getLogger(ShardCanCommitCoordinationTask.class);
  31
  32     private final DOMDataTreeIdentifier rootShardPrefix;
  33     private final Collection<DOMStoreThreePhaseCommitCohort> cohorts;
  34
  35     public ShardCanCommitCoordinationTask(final DOMDataTreeIdentifier rootShardPrefix,
  36                                        final Collection<DOMStoreThreePhaseCommitCohort> cohorts) {
  37         this.rootShardPrefix = requireNonNull(rootShardPrefix);
  38         this.cohorts = requireNonNull(cohorts);
  39     }
  40
  41     @Override
  42     public Boolean call() throws TransactionCommitFailedException {
  43
  44         try {
  45             LOG.debug("Shard {}, canCommit started", rootShardPrefix);
  46             canCommitBlocking();
  47
  48             return true;
  49         } catch (final TransactionCommitFailedException e) {
  50             LOG.warn("Shard: {} Submit Error during phase CanCommit, starting Abort", rootShardPrefix, e);
  51             //FIXME abort here
  52             throw e;
  53         }
  54     }
  55
  56     void canCommitBlocking() throws TransactionCommitFailedException {
  57         for (final ListenableFuture<?> canCommit : canCommitAll()) {
  58             try {
  59                 final Boolean result = (Boolean)canCommit.get();
  60                 if (result == null || !result) {
  61                     throw new TransactionCommitFailedException("CanCommit failed, no detailed cause available.");
  62                 }
  63             } catch (InterruptedException | ExecutionException e) {
  64                 throw new TransactionCommitFailedException("CanCommit failed", e);
  65             }
  66         }
  67     }
  68
  69     private ListenableFuture<?>[] canCommitAll() {
  70         final ListenableFuture<?>[] ops = new ListenableFuture<?>[cohorts.size()];
  71         int index = 0;
  72         for (final DOMStoreThreePhaseCommitCohort cohort : cohorts) {
  73             ops[index++] = cohort.canCommit();
  74         }
  75         return ops;
  76     }
  77 }