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/*
*  Copyright (c) 2005-2011, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
*  WSO2 Inc. 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.wso2.carbon.caching.impl;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.wso2.carbon.context.PrivilegedCarbonContext;
import org.wso2.carbon.utils.multitenancy.MultitenantConstants;

import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;

/**
 * TODO: class description
 * 
 * TODO: Also handle cache eviction - remove items from cache when the cache is full
 */
public class CacheCleanupTask implements Runnable {
    private static final Log log = LogFactory.getLog(CacheCleanupTask.class);
    private List caches = new CopyOnWriteArrayList();

    public void addCacheForMonitoring(CacheImpl cache) {
        caches.add(cache);
    }

    public void removeCacheFromMonitoring(CacheImpl cache) {
        caches.remove(cache);
    }

    @Override
    @SuppressWarnings("unchecked")
    public synchronized void run() {
        if (log.isDebugEnabled()) {
            log.debug("Cache expiry scheduler running...");
        }

        // Get all the caches
        // Get the configurations from the caches
        // Check the timeout policy and clear out old values
        try {
            PrivilegedCarbonContext.startTenantFlow();
            PrivilegedCarbonContext cc = PrivilegedCarbonContext.getThreadLocalCarbonContext();
            cc.setTenantId(MultitenantConstants.SUPER_TENANT_ID);
            cc.setTenantDomain(MultitenantConstants.SUPER_TENANT_DOMAIN_NAME);
            for (CacheImpl cache : caches) {
                try {
                    cache.runCacheExpiry();
                    if (log.isDebugEnabled()) {
                        log.debug("Cache expiry completed for the cache: " + cache.getName());
                    }
                } catch (IllegalStateException e) {
                    if (log.isDebugEnabled()) {
                        log.debug("Error occurred while running CacheCleanupTask for the cache: " + cache.getName(), e);
                    }
                } catch (Throwable e) {
                    log.error("Error occurred while running CacheCleanupTask for the cache: " + cache.getName(), e);
                }
            }
        } finally {
            PrivilegedCarbonContext.endTenantFlow();
        }
    }
}