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Camel Ehcache support
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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file 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 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 org.apache.camel.component.ehcache;

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import org.apache.camel.RuntimeCamelException;
import org.apache.camel.support.service.ServiceSupport;
import org.apache.camel.util.ObjectHelper;
import org.apache.camel.util.ReferenceCount;
import org.ehcache.Cache;
import org.ehcache.CacheManager;
import org.ehcache.UserManagedCache;
import org.ehcache.config.CacheConfiguration;
import org.ehcache.config.builders.CacheConfigurationBuilder;
import org.ehcache.config.builders.UserManagedCacheBuilder;
import org.ehcache.spi.service.ServiceConfiguration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class EhcacheManager extends ServiceSupport {
    private static final Logger LOGGER = LoggerFactory.getLogger(EhcacheManager.class);

    private final EhcacheConfiguration configuration;
    private final CacheManager cacheManager;
    private final ConcurrentMap> userCaches;
    private final ReferenceCount refCount;

    public EhcacheManager(CacheManager cacheManager, boolean managed, EhcacheConfiguration configuration) {
        this.cacheManager = ObjectHelper.notNull(cacheManager, "cacheManager");
        this.userCaches = new ConcurrentHashMap<>();
        this.configuration = configuration;
        this.refCount = ReferenceCount.on(
                managed ? cacheManager::init : () -> {
                },
                managed ? cacheManager::close : () -> {
                });
    }

    protected void incRef() {
        refCount.retain();
    }

    protected void decRef() {
        refCount.release();
    }

    @Override
    protected void doShutdown() throws Exception {
        if (userCaches != null && !userCaches.isEmpty()) {
            for (UserManagedCache cache : userCaches.values()) {
                try {
                    cache.close();
                } catch (Exception e) {
                    // ignore
                }
            }
            userCaches.clear();
        }
    }

    @SuppressWarnings("unchecked")
    public  Cache getCache(String name, Class keyType, Class valueType) throws Exception {
        CacheConfiguration cacheConfiguration = null;
        if (configuration != null) {
            if (configuration.hasConfiguration(name)) {
                LOGGER.debug("Using custom cache configuration for cache {}", name);
                cacheConfiguration = CacheConfiguration.class.cast(configuration.getConfigurations().get(name));
            } else if (configuration.hasConfiguration()) {
                LOGGER.debug("Using global cache configuration for cache {}", name);
                cacheConfiguration = CacheConfiguration.class.cast(configuration.getConfiguration());
            }
        }
        if (keyType == null && valueType == null) {
            if (cacheConfiguration != null) {
                keyType = cacheConfiguration.getKeyType();
                valueType = cacheConfiguration.getValueType();
            } else {
                keyType = (Class) Object.class;
                valueType = (Class) Object.class;
            }
        }
        Cache cache = cacheManager.getCache(name, keyType, valueType);
        if (cache == null && configuration != null && configuration.isCreateCacheIfNotExist()) {
            if (cacheConfiguration != null) {
                if (keyType != cacheConfiguration.getKeyType() || valueType != cacheConfiguration.getValueType()) {
                    LOGGER.info("Mismatch keyType / valueType configuration for cache {}", name);
                    CacheConfigurationBuilder builder = CacheConfigurationBuilder
                            .newCacheConfigurationBuilder(keyType, valueType, cacheConfiguration.getResourcePools())
                            .withClassLoader(cacheConfiguration.getClassLoader())
                            .withEvictionAdvisor(cacheConfiguration.getEvictionAdvisor())
                            .withExpiry(cacheConfiguration.getExpiryPolicy());
                    for (ServiceConfiguration serviceConfig : cacheConfiguration.getServiceConfigurations()) {
                        builder = builder.withService(serviceConfig);
                    }
                    cacheConfiguration = builder.build();
                }
                cache = cacheManager.createCache(name, cacheConfiguration);
            } else {
                // If a cache configuration is not provided, create a User Managed
                // Cache
                LOGGER.debug("Using a UserManagedCache for cache {} as no configuration has been found", name);
                Class kt = keyType;
                Class vt = valueType;
                cache = Cache.class.cast(userCaches.computeIfAbsent(
                        name,
                        key -> UserManagedCacheBuilder.newUserManagedCacheBuilder(kt, vt).build(true)));
            }
        }

        if (cache == null) {
            throw new RuntimeCamelException("Unable to retrieve the cache " + name + " from cache manager " + cacheManager);
        }

        return cache;
    }

    CacheManager getCacheManager() {
        return this.cacheManager;
    }

    ReferenceCount getReferenceCount() {
        return refCount;
    }
}