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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.axis2.context.ConfigurationContext;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.wso2.carbon.context.PrivilegedCarbonContext;
import org.wso2.carbon.utils.Axis2ConfigurationContextObserver;
import org.wso2.carbon.utils.multitenancy.MultitenantUtils;

import javax.cache.Caching;

/**
 * TODO: class description
 */
public class CachingAxisConfigurationObserver implements Axis2ConfigurationContextObserver {
    private static Log log = LogFactory.getLog(CachingAxisConfigurationObserver.class);

    @Override
    public void creatingConfigurationContext(int tenantId) {
        // Nothing to do
    }

    @Override
    public void createdConfigurationContext(ConfigurationContext configurationContext) {
        // Nothing to do
    }

    /**
     * In this method, we stop & remove all caches belonging to this tenant
     * Issue: if the tenant is active on other nodes, those also may get removed?
     * Remove only local caches on order to deal with issues that can arise when the cache in distributed
     *
     * @param configurationContext to Get the required information related to tenant
     */
    @Override
    public void terminatingConfigurationContext(ConfigurationContext configurationContext) {
        int tenantId = MultitenantUtils.getTenantId(configurationContext);
        try {
            if (log.isDebugEnabled()) {
                log.debug("Remove all caches of the tenant " + tenantId);
            }
            PrivilegedCarbonContext.startTenantFlow();
            PrivilegedCarbonContext carbonContext = PrivilegedCarbonContext.getThreadLocalCarbonContext();
            carbonContext.setTenantId(tenantId, true);
            ((CacheManagerFactoryImpl) Caching.getCacheManagerFactory()).
                    removeAllCacheManagers(carbonContext.getTenantDomain());
        } finally {
            PrivilegedCarbonContext.endTenantFlow();
        }
    }

    @Override
    public void terminatedConfigurationContext(ConfigurationContext configurationContext) {
        // Nothing to do
    }
}