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* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
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*
* 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
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package org.apache.cayenne.access;
import java.util.Map;
import org.apache.cayenne.CayenneRuntimeException;
import org.apache.cayenne.Persistent;
import org.apache.cayenne.configuration.Constants;
import org.apache.cayenne.configuration.RuntimeProperties;
import org.apache.cayenne.di.Inject;
import org.apache.commons.collections.map.AbstractReferenceMap;
import org.apache.commons.collections.map.ReferenceMap;
/**
* Default implementation of {@link ObjectMapRetainStrategy}.
*
* @since 3.1
*/
public class DefaultObjectMapRetainStrategy implements ObjectMapRetainStrategy {
private static final String WEAK_RETAIN_STRATEGY = "weak";
private static final String SOFT_RETAIN_STRATEGY = "soft";
private static final String HARD_RETAIN_STRATEGY = "hard";
protected RuntimeProperties runtimeProperties;
public DefaultObjectMapRetainStrategy(@Inject RuntimeProperties runtimeProperties) {
this.runtimeProperties = runtimeProperties;
}
@SuppressWarnings("unchecked")
public Map<Object, Persistent> createObjectMap() {
String strategy = runtimeProperties
.get(Constants.SERVER_OBJECT_RETAIN_STRATEGY_PROPERTY);
if (strategy == null || WEAK_RETAIN_STRATEGY.equals(strategy)) {
return new ReferenceMap(AbstractReferenceMap.HARD, AbstractReferenceMap.WEAK);
} else if (SOFT_RETAIN_STRATEGY.equals(strategy)) {
return new ReferenceMap(AbstractReferenceMap.HARD, AbstractReferenceMap.SOFT);
} else if (HARD_RETAIN_STRATEGY.equals(strategy)) {
return new ReferenceMap(AbstractReferenceMap.HARD, AbstractReferenceMap.HARD);
} else {
throw new CayenneRuntimeException("Unsupported retain strategy %s", strategy);
}
}
}