net.ontopia.persistence.proxy.DefaultCaches.java Source code

Introduction

Here is the source code for net.ontopia.persistence.proxy.DefaultCaches.java

Source

/*
 * #!
 * Ontopia Engine
 * #-
 * Copyright (C) 2001 - 2013 The Ontopia Project
 * #-
 * 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 net.ontopia.persistence.proxy;

import java.util.Collections;
import java.util.Map;
import net.ontopia.utils.OntopiaRuntimeException;
import org.apache.commons.collections4.map.AbstractReferenceMap;
import org.apache.commons.collections4.map.ReferenceMap;

/**
 * INTERNAL: Default caches.
 */

public class DefaultCaches implements CachesIF {

    DefaultCaches() {
        // NOTE: no need to hold references to the caches as only one copy
        // will every be requested anyway as we do not do any clustering.
    }

    public <K, V> Map<K, V> createDataCache() {
        return Collections.synchronizedMap(this.<K, V>createSoftHashMap());
    }

    public <K, V> CacheIF<K, V> createCache(int cacheType, IdentityIF namespace) {
        switch (cacheType) {
        case CachesIF.QUERY_CACHE_SRCLOC:
            return createCache();
        case CachesIF.QUERY_CACHE_SUBIND:
            return createCache();
        case CachesIF.QUERY_CACHE_SUBLOC:
            return createCache();
        case CachesIF.QUERY_CACHE_RT1:
            return createCache();
        case CachesIF.QUERY_CACHE_RT2:
            return createCache();
        default:
            throw new OntopiaRuntimeException("Invalid cache type: " + cacheType);
        }
    }

    // --- helper

    private <K, V> CacheIF<K, V> createCache() {
        return new DefaultCache<K, V>(this.<K, V>createSoftHashMap());
    }

    private <K, V> Map<K, V> createSoftHashMap() {
        return new ReferenceMap<K, V>(AbstractReferenceMap.ReferenceStrength.SOFT,
                AbstractReferenceMap.ReferenceStrength.HARD);
    }
}