/**
* 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.lucene.gdata.storage.lucenestorage;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.lucene.gdata.data.GDataAccount;
import org.apache.lucene.gdata.data.ServerBaseEntry;
import org.apache.lucene.gdata.data.ServerBaseFeed;
import org.apache.lucene.gdata.server.registry.ComponentType;
import org.apache.lucene.gdata.server.registry.GDataServerRegistry;
import org.apache.lucene.gdata.storage.ModificationConflictException;
import org.apache.lucene.gdata.storage.ResourceNotFoundException;
import org.apache.lucene.gdata.storage.Storage;
import org.apache.lucene.gdata.storage.StorageController;
import org.apache.lucene.gdata.storage.StorageException;
import org.apache.lucene.gdata.storage.lucenestorage.StorageEntryWrapper.StorageOperation;
import org.apache.lucene.gdata.utils.ReferenceCounter;
import com.google.gdata.data.BaseEntry;
import com.google.gdata.data.BaseFeed;
/**
* This is an implementation of the
* {@link org.apache.lucene.gdata.storage.Storage} interface. The
* StorageImplementation provides access to the
* {@link org.apache.lucene.gdata.storage.lucenestorage.StorageQuery} and the
* {@link org.apache.lucene.gdata.storage.lucenestorage.StorageModifier}. This
* class will be instantiated per client request.
*
*
*
* @author Simon Willnauer
*
*/
public class StorageImplementation implements Storage {
private final StorageCoreController controller;
private static final Log LOG = LogFactory
.getLog(StorageImplementation.class);
/**
* Creates a new StorageImplementation
*
* @throws StorageException -
* if the storage controller can not be obtained
*
*
*
*/
public StorageImplementation() throws StorageException {
this.controller = (StorageCoreController) GDataServerRegistry
.getRegistry().lookup(StorageController.class,
ComponentType.STORAGECONTROLLER);
if (this.controller == null)
throw new StorageException("Can't get registered StorageController");
}
/**
* @see org.apache.lucene.gdata.storage.Storage#storeEntry(org.apache.lucene.gdata.data.ServerBaseEntry)
*/
public BaseEntry storeEntry(final ServerBaseEntry entry)
throws StorageException {
if (entry == null)
throw new StorageException("entry is null");
if(entry.getFeedId() == null)
throw new StorageException("feed-id is null");
if(entry.getVersion() != 1)
throw new StorageException("entry version must be 1");
if(entry.getServiceConfig() == null)
throw new StorageException("ProvidedService must not be null");
StorageModifier modifier = this.controller.getStorageModifier();
String id = this.controller.releaseId();
entry.setId(entry.getFeedId() + id);
if (LOG.isInfoEnabled())
LOG.info("Store entry " + id + " -- feed: " + entry.getFeedId());
try {
StorageEntryWrapper wrapper = new StorageEntryWrapper(entry,
StorageOperation.INSERT);
modifier.insertEntry(wrapper);
} catch (IOException e) {
StorageException ex = new StorageException("Can't create Entry -- "
+ e.getMessage(), e);
ex.setStackTrace(e.getStackTrace());
throw ex;
}
return entry.getEntry();
}
/**
* @see org.apache.lucene.gdata.storage.Storage#deleteEntry(org.apache.lucene.gdata.data.ServerBaseEntry)
*/
public void deleteEntry(final ServerBaseEntry entry)
throws StorageException {
if (entry == null)
throw new StorageException("Entry is null");
if(entry.getId() == null)
throw new StorageException("Entry id is null");
if(entry.getFeedId() == null)
throw new StorageException("feed id is null");
if (LOG.isInfoEnabled())
LOG.info("delete entry " + entry.getId() + " -- feed: "
+ entry.getFeedId());
StorageModifier modifier = this.controller.getStorageModifier();
ReferenceCounter<StorageQuery> query = this.controller.getStorageQuery();
// try to set concurrency Lock
String key = entry.getId();
setLock(key);
try{
if(query.get().isEntryStored(entry.getId(),entry.getFeedId())){
if(query.get().checkEntryVersion(entry.getId(),entry.getFeedId(),entry.getVersion())){
modifier.deleteEntry(new StorageEntryWrapper(entry,StorageOperation.DELETE));
}else
throw new ModificationConflictException("The entry version does not match -- entry "+entry.getId()+" feed:"+entry.getFeedId()+" version: "+entry.getVersion());
}
else
throw new ResourceNotFoundException("Entry for entry id: "+entry.getId()+" is not stored");
}catch (IOException e) {
throw new StorageException("Can not access storage");
}finally{
if(query != null)
query.decrementRef();
// release lock for concurrency
releaseLock(key);
}
}
/**
* @see org.apache.lucene.gdata.storage.Storage#updateEntry(org.apache.lucene.gdata.data.ServerBaseEntry)
*/
public BaseEntry updateEntry(ServerBaseEntry entry) throws StorageException {
if (entry == null)
throw new StorageException("entry is null");
if(entry.getId() == null)
throw new StorageException("entry id is null");
if(entry.getServiceConfig() == null)
throw new StorageException("service config is not set -- null");
if(entry.getFeedId() == null)
throw new StorageException("feed id is null");
if (LOG.isInfoEnabled())
LOG.info("update entry " + entry.getId() + " -- feed: "
+ entry.getFeedId());
StorageModifier modifier = this.controller.getStorageModifier();
ReferenceCounter<StorageQuery> query = this.controller.getStorageQuery();
// try to set concurrency Lock
String key = entry.getId();
setLock(key);
try {
if(query.get().isEntryStored(entry.getId(),entry.getFeedId())){
if(query.get().checkEntryVersion(entry.getId(),entry.getFeedId(),entry.getVersion())){
entry.setVersion(entry.getVersion()+1);
StorageEntryWrapper wrapper = new StorageEntryWrapper(entry,
StorageOperation.UPDATE);
modifier.updateEntry(wrapper);
}else
throw new ModificationConflictException("The entry version does not match -- entry "+entry.getId()+" feed:"+entry.getFeedId()+" version: "+entry.getVersion());
}else
throw new ResourceNotFoundException("Entry for entry id: "+entry.getId()+" is not stored");
} catch (IOException e) {
LOG.error("Can't update entry for feedID: " + entry.getFeedId()
+ "; entryId: " + entry.getId() + " -- " + e.getMessage(),
e);
StorageException ex = new StorageException("Can't update Entry -- "
+ e.getMessage(), e);
ex.setStackTrace(e.getStackTrace());
throw ex;
}
finally{
if(query != null)
query.decrementRef();
// release lock for concurrency
releaseLock(key);
}
return entry.getEntry();
}
private void setLock(String key) throws ModificationConflictException{
if(!this.controller.getLock().setLock(key))
throw new ModificationConflictException("Can not set lock for entry -- "+key);
}
private void releaseLock(String key) throws StorageException{
if(!this.controller.getLock().releaseLock(key))
throw new StorageException("Can not release lock for key: "+key);
}
/**
* @see org.apache.lucene.gdata.storage.Storage#getFeed(org.apache.lucene.gdata.data.ServerBaseFeed)
*/
@SuppressWarnings("unchecked")
public BaseFeed getFeed(final ServerBaseFeed feed) throws StorageException {
if (feed == null)
throw new StorageException("feed is null");
if (LOG.isInfoEnabled())
LOG.info("get feed: " + feed.getId() + " start-index: "
+ feed.getStartIndex() + " resultCount: "
+ feed.getItemsPerPage());
ReferenceCounter<StorageQuery> query = null;
try {
query = this.controller.getStorageQuery();
BaseFeed retVal = query.get().getLatestFeedQuery(feed.getId(),
feed.getItemsPerPage(), feed.getStartIndex(),
feed.getServiceConfig());
return retVal;
} catch (Exception e) {
LOG.error("Can't get latest feed for feedID: " + feed.getId()
+ " -- " + e.getMessage(), e);
StorageException ex = new StorageException("Can't create Entry -- "
+ e.getMessage(), e);
ex.setStackTrace(e.getStackTrace());
throw ex;
} finally {
if (query != null)
query.decrementRef();
}
}
/**
* @see org.apache.lucene.gdata.storage.Storage#getEntry(org.apache.lucene.gdata.data.ServerBaseEntry)
*/
public BaseEntry getEntry(final ServerBaseEntry entry)
throws StorageException {
if (entry == null)
throw new StorageException("No entry specified -- is null");
if (LOG.isInfoEnabled())
LOG.info("get entry " + entry.getId() + " -- feed: "
+ entry.getFeedId());
ReferenceCounter<StorageQuery> query = null;
try {
query = this.controller.getStorageQuery();
BaseEntry retVal = query.get().singleEntryQuery(entry.getId(),
entry.getFeedId(), entry.getServiceConfig());
if(retVal == null)
throw new ResourceNotFoundException("can not get entry for entry ID "+entry.getId());
return retVal;
} catch (Exception e) {
LOG.error("Can't get entry for feedID: " + entry.getFeedId()
+ "; entryId: " + entry.getId() + " -- " + e.getMessage(),
e);
StorageException ex = new StorageException("Can't create Entry -- "
+ e.getMessage(), e);
ex.setStackTrace(e.getStackTrace());
throw ex;
} finally {
if (query != null)
query.decrementRef();
}
}
/**
* @see org.apache.lucene.gdata.storage.Storage#close()
*/
public void close() {
//
}
/**
* @see org.apache.lucene.gdata.storage.Storage#storeAccount(org.apache.lucene.gdata.data.GDataAccount)
*/
public void storeAccount(GDataAccount Account) throws StorageException {
if (Account == null)
throw new StorageException("Can not save null Account");
ReferenceCounter<StorageQuery> query = null;
try {
query = this.controller.getStorageQuery();
if (query.get().getUser(Account.getName()) != null)
throw new StorageException("Account already exists");
StorageModifier modifier = this.controller.getStorageModifier();
StorageAccountWrapper wrapper = new StorageAccountWrapper(Account);
modifier.createAccount(wrapper);
} catch (Exception e) {
LOG.error("Can't save Account -- " + e.getMessage(), e);
StorageException ex = new StorageException("Can't save Account -- "
+ e.getMessage(), e);
ex.setStackTrace(e.getStackTrace());
throw ex;
} finally {
if (query != null)
query.decrementRef();
}
}
/**
* @see org.apache.lucene.gdata.storage.Storage#updateAccount(org.apache.lucene.gdata.data.GDataAccount)
*/
public void updateAccount(GDataAccount Account) throws StorageException {
if (Account == null)
throw new StorageException("Can not update null Account");
ReferenceCounter<StorageQuery> query = null;
try {
query = this.controller.getStorageQuery();
if (query.get().getUser(Account.getName()) == null)
throw new StorageException("Account does not exist");
StorageModifier modifier = this.controller.getStorageModifier();
StorageAccountWrapper wrapper = new StorageAccountWrapper(Account);
modifier.updateAccount(wrapper);
} catch (Exception e) {
LOG.error("Can't update Account -- " + e.getMessage(), e);
StorageException ex = new StorageException(
"Can't update Account -- " + e.getMessage(), e);
ex.setStackTrace(e.getStackTrace());
throw ex;
} finally {
if (query != null)
query.decrementRef();
}
}
/**
* @see org.apache.lucene.gdata.storage.Storage#deleteAccount(java.lang.String)
*/
public void deleteAccount(String Accountname) throws StorageException {
if (Accountname == null)
throw new StorageException("can not delete null Account");
ReferenceCounter<StorageQuery> query = null;
try {
query = this.controller.getStorageQuery();
if (query.get().getUser(Accountname) == null)
throw new StorageException("Account does not exist");
StorageModifier modifier = this.controller.getStorageModifier();
modifier.deleteAccount(Accountname);
} catch (Exception e) {
LOG.error("Can't update Account -- " + e.getMessage(), e);
StorageException ex = new StorageException(
"Can't update Account -- " + e.getMessage(), e);
ex.setStackTrace(e.getStackTrace());
throw ex;
} finally {
if (query != null)
query.decrementRef();
}
}
/**
* @see org.apache.lucene.gdata.storage.Storage#storeFeed(org.apache.lucene.gdata.data.ServerBaseFeed,
* java.lang.String)
*/
public void storeFeed(ServerBaseFeed feed, String accountName)
throws StorageException {
if (feed == null)
throw new StorageException("can not insert null feed");
if (accountName == null)
throw new StorageException("accountName must not be null");
ReferenceCounter<StorageQuery> query = null;
try {
query = this.controller.getStorageQuery();
if (query.get().isFeedStored(feed.getId()))
throw new StorageException("feed with feedID " + feed.getId()
+ " is already stored");
StorageModifier modifier = this.controller.getStorageModifier();
StorageFeedWrapper wrapper = new StorageFeedWrapper(feed,
accountName);
modifier.createFeed(wrapper);
} catch (Exception e) {
LOG.error("Can't create feed -- " + e.getMessage(), e);
StorageException ex = new StorageException("Can't create feed -- "
+ e.getMessage(), e);
ex.setStackTrace(e.getStackTrace());
throw ex;
} finally {
if (query != null)
query.decrementRef();
}
}
/**
* @see org.apache.lucene.gdata.storage.Storage#deleteFeed(java.lang.String)
*/
public void deleteFeed(String feedId) throws StorageException {
if (feedId == null)
throw new StorageException("can not delete feed id is null ");
ReferenceCounter<StorageQuery> query = null;
try {
query = this.controller.getStorageQuery();
if (!query.get().isFeedStored(feedId))
throw new StorageException("Account does not exist");
StorageModifier modifier = this.controller.getStorageModifier();
modifier.deleteFeed(feedId);
} catch (Exception e) {
LOG.error("Can't delete feed -- " + e.getMessage(), e);
StorageException ex = new StorageException("Can't create feed -- "
+ e.getMessage(), e);
ex.setStackTrace(e.getStackTrace());
throw ex;
} finally {
if (query != null)
query.decrementRef();
}
}
/**
* @see org.apache.lucene.gdata.storage.Storage#updateFeed(org.apache.lucene.gdata.data.ServerBaseFeed,
* java.lang.String)
*/
public void updateFeed(ServerBaseFeed feed, String accountName)
throws StorageException {
if (feed == null)
throw new StorageException("can not update null feed");
if (accountName == null)
throw new StorageException("accountName must not be null");
ReferenceCounter<StorageQuery> query = null;
try {
query = this.controller.getStorageQuery();
if (!query.get().isFeedStored(feed.getId()))
throw new StorageException("Account does not exist");
StorageModifier modifier = this.controller.getStorageModifier();
StorageFeedWrapper wrapper = new StorageFeedWrapper(feed,
accountName);
modifier.updateFeed(wrapper);
} catch (Exception e) {
LOG.error("Can't create feed -- " + e.getMessage(), e);
StorageException ex = new StorageException("Can't create feed -- "
+ e.getMessage(), e);
ex.setStackTrace(e.getStackTrace());
throw ex;
} finally {
if (query != null)
query.decrementRef();
}
}
/**
* @see org.apache.lucene.gdata.storage.Storage#getServiceForFeed(java.lang.String)
*/
public String getServiceForFeed(String feedId) throws StorageException {
if (feedId == null)
throw new StorageException("no feed for the feedID == null");
ReferenceCounter<StorageQuery> query = null;
try {
query = this.controller.getStorageQuery();
String type = query.get().getService(feedId);
if (type == null)
throw new StorageException("no feed for the feedID == "
+ feedId + " found");
return type;
} catch (Exception e) {
throw new StorageException("Can not access storage", e);
} finally {
if (query != null)
query.decrementRef();
}
}
/**
* @see org.apache.lucene.gdata.storage.Storage#getAccount(java.lang.String)
*/
public GDataAccount getAccount(String accountName) throws StorageException {
if (accountName == null)
throw new StorageException("account name must not be null");
ReferenceCounter<StorageQuery> query = null;
try {
query = this.controller.getStorageQuery();
return query.get().getUser(accountName);
} catch (Exception e) {
throw new StorageException("Can not access storage", e);
} finally {
if (query != null)
query.decrementRef();
}
}
/**
* @see org.apache.lucene.gdata.storage.Storage#getAccountNameForFeedId(java.lang.String)
*/
public String getAccountNameForFeedId(String feedId)
throws StorageException {
if (feedId == null)
throw new StorageException("feed-id must not be null");
ReferenceCounter<StorageQuery> query = null;
try {
query = this.controller.getStorageQuery();
String accountName = query.get().getAccountNameForFeedId(feedId);
if (accountName == null)
throw new StorageException("no feed for feedId " + feedId
+ " found");
return accountName;
} catch (IOException e) {
throw new StorageException("Can not access storage - "
+ e.getMessage(), e);
} finally {
if (query != null)
query.decrementRef();
}
}
/**
* @see org.apache.lucene.gdata.storage.Storage#getEntryLastModified(java.lang.String, java.lang.String)
*/
public Long getEntryLastModified(String entryId,String feedId) throws StorageException {
ReferenceCounter<StorageQuery> query = null;
try {
query = this.controller.getStorageQuery();
return new Long(query.get().getEntryLastModified(entryId,feedId));
} catch (IOException e) {
throw new StorageException("Can not access storage - "
+ e.getMessage(), e);
} finally {
if (query != null)
query.decrementRef();
}
}
/**
* @see org.apache.lucene.gdata.storage.Storage#getFeedLastModified(java.lang.String)
*/
public Long getFeedLastModified(String feedId) throws StorageException {
ReferenceCounter<StorageQuery> query = null;
try {
query = this.controller.getStorageQuery();
return new Long(query.get().getFeedLastModified(feedId));
} catch (IOException e) {
throw new StorageException("Can not access storage - "
+ e.getMessage(), e);
} finally {
if (query != null)
query.decrementRef();
}
}
}
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