opendaylight/md-sal/clustered-data-store/implementation/src/main/java/org/opendaylight/controller/datastore/internal/ClusteredDataStoreImpl.java

   1
   2 /*
   3  * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
   4  *
   5  * This program and the accompanying materials are made available under the
   6  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   7  * and is available at http://www.eclipse.org/legal/epl-v10.html
   8  */
   9
  10 package org.opendaylight.controller.datastore.internal;
  11
  12 import com.google.common.base.Preconditions;
  13 import org.opendaylight.controller.clustering.services.CacheConfigException;
  14 import org.opendaylight.controller.clustering.services.CacheExistException;
  15 import org.opendaylight.controller.clustering.services.IClusterGlobalServices;
  16 import org.opendaylight.controller.clustering.services.IClusterServices;
  17 import org.opendaylight.controller.datastore.ClusteredDataStore;
  18 import org.opendaylight.controller.md.sal.common.api.data.DataModification;
  19 import org.opendaylight.controller.sal.common.util.Rpcs;
  20 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  21 import org.opendaylight.yangtools.yang.common.RpcError;
  22 import org.opendaylight.yangtools.yang.common.RpcResult;
  23
  24 import java.util.Collections;
  25 import java.util.EnumSet;
  26 import java.util.Set;
  27 import java.util.concurrent.ConcurrentMap;
  28
  29 /**
  30  * The ClusteredDataStoreImpl stores global data to be shared across a controller cluster. It uses Clustering Services.
  31  */
  32 public class ClusteredDataStoreImpl implements ClusteredDataStore {
  33
  34
  35     public static final String OPERATIONAL_DATA_CACHE = "clustered_data_store.operational_data_cache";
  36     public static final String CONFIGURATION_DATA_CACHE = "clustered_data_store.configuration_data_cache";
  37
  38     private final ConcurrentMap operationalDataCache;
  39     private final ConcurrentMap configurationDataCache;
  40
  41     public ClusteredDataStoreImpl(IClusterGlobalServices clusterGlobalServices) throws CacheExistException, CacheConfigException {
  42         Preconditions.checkNotNull(clusterGlobalServices, "clusterGlobalServices cannot be null");
  43
  44         operationalDataCache = getOrCreateCache(clusterGlobalServices, OPERATIONAL_DATA_CACHE);
  45
  46         if(operationalDataCache == null){
  47             Preconditions.checkNotNull(operationalDataCache, "operationalDataCache cannot be null");
  48         }
  49
  50         configurationDataCache = getOrCreateCache(clusterGlobalServices, CONFIGURATION_DATA_CACHE);
  51
  52         if(configurationDataCache == null){
  53             Preconditions.checkNotNull(configurationDataCache, "configurationDataCache cannot be null");
  54         }
  55
  56     }
  57
  58     @Override
  59     public DataCommitTransaction<InstanceIdentifier<? extends Object>, Object> requestCommit(DataModification<InstanceIdentifier<? extends Object>, Object> modification) {
  60         return new ClusteredDataStoreTransaction(modification);
  61     }
  62
  63     @Override
  64     public Object readOperationalData(InstanceIdentifier<? extends Object> path) {
  65         Preconditions.checkNotNull(path, "path cannot be null");
  66         return operationalDataCache.get(path);
  67     }
  68
  69     @Override
  70     public Object readConfigurationData(InstanceIdentifier<? extends Object> path) {
  71         Preconditions.checkNotNull(path, "path cannot be null");
  72         return configurationDataCache.get(path);
  73     }
  74
  75     private RpcResult<Void> finish(final ClusteredDataStoreTransaction transaction) {
  76       final DataModification<InstanceIdentifier<? extends Object>,Object> modification = transaction.getModification();
  77
  78       this.configurationDataCache.putAll(modification.getUpdatedConfigurationData());
  79       this.operationalDataCache.putAll(modification.getUpdatedOperationalData());
  80
  81       for (final InstanceIdentifier<? extends Object> removal : modification.getRemovedConfigurationData()) {
  82         this.configurationDataCache.remove(removal);
  83       }
  84
  85       for (final InstanceIdentifier<? extends Object> removal : modification.getRemovedOperationalData()) {
  86         this.operationalDataCache.remove(removal  );
  87       }
  88
  89       Set<RpcError> _emptySet = Collections.<RpcError>emptySet();
  90       return Rpcs.<Void>getRpcResult(true, null, _emptySet);
  91     }
  92
  93     private RpcResult<Void> rollback(final ClusteredDataStoreTransaction transaction) {
  94       Set<RpcError> _emptySet = Collections.<RpcError>emptySet();
  95       return Rpcs.<Void>getRpcResult(true, null, _emptySet);
  96     }
  97
  98
  99     private ConcurrentMap getOrCreateCache(IClusterGlobalServices clusterGlobalServices, String name) throws CacheConfigException {
 100         ConcurrentMap cache = clusterGlobalServices.getCache(name);
 101
 102         if(cache == null) {
 103             try {
 104                 cache = clusterGlobalServices.createCache(name, EnumSet.of(IClusterServices.cacheMode.TRANSACTIONAL));
 105             } catch (CacheExistException e) {
 106                 cache = clusterGlobalServices.getCache(name);
 107             }
 108         }
 109         return cache;
 110     }
 111
 112     private class ClusteredDataStoreTransaction implements DataCommitTransaction<InstanceIdentifier<? extends Object>, Object> {
 113         private final DataModification<InstanceIdentifier<? extends Object>,Object> modification;
 114
 115         public ClusteredDataStoreTransaction(DataModification<InstanceIdentifier<? extends Object>,Object> modification){
 116             Preconditions.checkNotNull(modification, "modification cannot be null");
 117
 118             this.modification = modification;
 119         }
 120
 121         @Override
 122         public DataModification<InstanceIdentifier<? extends Object>, Object> getModification() {
 123             return this.modification;
 124         }
 125
 126         @Override
 127         public RpcResult<Void> finish() throws IllegalStateException {
 128             return ClusteredDataStoreImpl.this.finish(this);
 129         }
 130
 131         @Override
 132         public RpcResult<Void> rollback() throws IllegalStateException {
 133             return ClusteredDataStoreImpl.this.rollback(this);
 134         }
 135     }
 136 }