/*
* Copyright (c) 2010-2012 Lockheed Martin Corporation
*
* 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 org.eurekastreams.server.action.execution.stream;
import java.io.Serializable;
import java.util.Collections;
import org.apache.commons.logging.Log;
import org.eurekastreams.commons.actions.TaskHandlerExecutionStrategy;
import org.eurekastreams.commons.actions.context.PrincipalActionContext;
import org.eurekastreams.commons.actions.context.TaskHandlerActionContext;
import org.eurekastreams.commons.logging.LogFactory;
import org.eurekastreams.commons.server.UserActionRequest;
import org.eurekastreams.server.action.request.SharedResourceRequest;
import org.eurekastreams.server.action.request.stream.SetSharedResourceLikeRequest;
import org.eurekastreams.server.domain.stream.SharedResource;
import org.eurekastreams.server.persistence.mappers.DomainMapper;
import org.eurekastreams.server.persistence.mappers.cache.Cache;
import org.eurekastreams.server.persistence.mappers.cache.CacheKeys;
import org.eurekastreams.server.persistence.mappers.cache.Transformer;
import org.eurekastreams.server.persistence.mappers.requests.SetSharedResourceLikeMapperRequest;
/**
* Execution strategy to set the liked/unliked status of a shared resource.
*/
public class SetSharedResourceLikeExecution implements TaskHandlerExecutionStrategy<PrincipalActionContext>
{
/**
* Logger.
*/
private final Log log = LogFactory.make();
/**
* Mapper to update the like/unlike status of a shared resource.
*/
private final DomainMapper<SetSharedResourceLikeMapperRequest, Boolean> setLikedResourceStatusMapper;
/**
* Mapper to get or insert shared resources.
*/
private final DomainMapper<SharedResourceRequest, SharedResource> findOrInsertSharedResourceMapper;
/**
* Cache - used to immediately delete the shared resource cache key - it'll then be queued up to prevent the race
* condition.
*/
private final Cache cache;
/** Transforms a shared resource's unique key to a cache key suffix. */
private final Transformer<String, String> sharedResourceCacheKeySuffixTransformer;
/**
* @param inSetLikedResourceStatusMapper
* the mapper to use to update the person's liked status of the shared resource
* @param inFindOrInsertSharedResourceMapper
* mapper to get or insert shared resources
* @param inCache
* the cache to use to remove the shared resource
* @param inSharedResourceCacheKeySuffixTransformer
* Transforms a shared resource's unique key to a cache key suffix.
*/
public SetSharedResourceLikeExecution(
final DomainMapper<SetSharedResourceLikeMapperRequest, Boolean> inSetLikedResourceStatusMapper,
final DomainMapper<SharedResourceRequest, SharedResource> inFindOrInsertSharedResourceMapper,
final Cache inCache, final Transformer<String, String> inSharedResourceCacheKeySuffixTransformer)
{
setLikedResourceStatusMapper = inSetLikedResourceStatusMapper;
findOrInsertSharedResourceMapper = inFindOrInsertSharedResourceMapper;
cache = inCache;
sharedResourceCacheKeySuffixTransformer = inSharedResourceCacheKeySuffixTransformer;
}
/**
* Set the liked/unlked status of a shared resource for a person.
*
* @param inActionContext
* the action context.
* @return true
*/
@Override
public Serializable execute(final TaskHandlerActionContext<PrincipalActionContext> inActionContext)
{
SetSharedResourceLikeRequest request = (SetSharedResourceLikeRequest) inActionContext.getActionContext()
.getParams();
if (request == null || request.getUniqueKey() == null)
{
return new Boolean(false);
}
final String sharedResourceUniqueKey = request.getUniqueKey().toLowerCase();
final Long personId = inActionContext.getActionContext().getPrincipal().getId();
// find the shared resource
SharedResource sr = findOrInsertSharedResourceMapper.execute(new SharedResourceRequest(
sharedResourceUniqueKey, null));
SetSharedResourceLikeMapperRequest mapperRequest = new SetSharedResourceLikeMapperRequest(personId, sr,
request.getLikes());
setLikedResourceStatusMapper.execute(mapperRequest);
// clean up the cache
String cacheKey = CacheKeys.SHARED_RESOURCE_BY_UNIQUE_KEY
+ sharedResourceCacheKeySuffixTransformer.transform(sharedResourceUniqueKey);
// delete the cache immediately
log.debug("Immediately deleting cache key while in transaction '" + cacheKey
+ "', then queuing it up for post-transaction cleanup to avoid race.");
cache.delete(cacheKey);
// queue up a cache delete for after this transaction is closed - to prevent race condition
inActionContext.getUserActionRequests().add(
new UserActionRequest("deleteCacheKeysAction", null, (Serializable) Collections.singleton(cacheKey)));
return new Boolean(true);
}
}