/*
* Copyright 2008-2009 LinkedIn, Inc
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package voldemort.store.versioned;
import voldemort.VoldemortException;
import voldemort.store.DelegatingStore;
import voldemort.store.Store;
import voldemort.store.StoreCapabilityType;
import voldemort.utils.Time;
import voldemort.versioning.VectorClock;
import voldemort.versioning.Versioned;
/**
* A wrapper that increments the version on the value for puts and delegates all
* other operations
*
*
* @param <K> The key type
* @param <V> The value type
* @param <T> The transforms type
*/
public class VersionIncrementingStore<K, V, T> extends DelegatingStore<K, V, T> {
private final short nodeId;
private final Time time;
public VersionIncrementingStore(Store<K, V, T> innerStore, int nodeId, Time time) {
super(innerStore);
this.nodeId = (short) nodeId;
this.time = time;
}
@Override
public void put(K key, Versioned<V> value, T transforms) throws VoldemortException {
value = value.cloneVersioned();
VectorClock clock = (VectorClock) value.getVersion();
clock.incrementVersion(nodeId, time.getMilliseconds());
super.put(key, value, transforms);
}
@Override
public Object getCapability(StoreCapabilityType capability) {
if(StoreCapabilityType.VERSION_INCREMENTING.equals(capability))
return true;
else
return super.getCapability(capability);
}
}