com.hazelcast.cache.BuiltInCacheMergePolicies Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2015, Hazelcast, Inc. All Rights Reserved.
*
* 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 com.hazelcast.cache;
import com.hazelcast.cache.merge.HigherHitsCacheMergePolicy;
import com.hazelcast.cache.merge.LatestAccessCacheMergePolicy;
import com.hazelcast.cache.merge.PassThroughCacheMergePolicy;
import com.hazelcast.cache.merge.PutIfAbsentCacheMergePolicy;
/**
*
* Enum that represents all built-in {@link com.hazelcast.cache.CacheMergePolicy} implementations.
*
*
*
* Note:
* When a new built-in {@link com.hazelcast.cache.CacheMergePolicy} is implemented,
* its definition should be added here also.
*
*/
public enum BuiltInCacheMergePolicies {
/**
* Cache merge policy that merges cache entry from source to destination directly.
*/
PASS_THROUGH(PassThroughCacheMergePolicy.class, new CacheMergePolicyInstanceFactory() {
@Override
public CacheMergePolicy create() {
return new PassThroughCacheMergePolicy();
}
}),
/**
* Cache merge policy that merges cache entry from source to destination
* if it does not exist in the destination cache.
*/
PUT_IF_ABSENT(PutIfAbsentCacheMergePolicy.class, new CacheMergePolicyInstanceFactory() {
@Override
public CacheMergePolicy create() {
return new PutIfAbsentCacheMergePolicy();
}
}),
/**
* Cache merge policy that merges cache entry from source to destination cache
* if source entry has more hits than the destination one.
*/
HIGHER_HITS(HigherHitsCacheMergePolicy.class, new CacheMergePolicyInstanceFactory() {
@Override
public CacheMergePolicy create() {
return new HigherHitsCacheMergePolicy();
}
}),
/**
* Cache merge policy that merges cache entry from source to destination cache
* if source entry has been accessed more recently than the destination entry.
*/
LATEST_ACCESS(LatestAccessCacheMergePolicy.class, new CacheMergePolicyInstanceFactory() {
@Override
public CacheMergePolicy create() {
return new LatestAccessCacheMergePolicy();
}
});
private Class implClass;
private CacheMergePolicyInstanceFactory instanceFactory;
BuiltInCacheMergePolicies(Class implClass,
CacheMergePolicyInstanceFactory instanceFactory) {
this.implClass = implClass;
this.instanceFactory = instanceFactory;
}
public Class getImplementationClass() {
return implClass;
}
/**
* Gets the name of the implementation class of {@link CacheMergePolicy}.
*
* @return the name of the implementation class of {@link CacheMergePolicy}.
*/
public String getImplementationClassName() {
return implClass.getName();
}
/**
* Create a new instance of {@link CacheMergePolicy}.
*
* @return the created instance of {@link CacheMergePolicy}
*/
public CacheMergePolicy newInstance() {
return instanceFactory.create();
}
/**
* Gets the definition of the default {@link CacheMergePolicy}.
*
* @return the definition of the default {@link CacheMergePolicy}
*/
public static BuiltInCacheMergePolicies getDefault() {
return PASS_THROUGH;
}
private interface CacheMergePolicyInstanceFactory {
CacheMergePolicy create();
}
}