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