| /* |
| * Copyright 2012 Paul Merlin. |
| * |
| * 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.apache.zest.entitystore.riak; |
| |
| import com.basho.riak.client.IRiakClient; |
| import com.basho.riak.client.IRiakObject; |
| import com.basho.riak.client.RiakException; |
| import com.basho.riak.client.RiakRetryFailedException; |
| import com.basho.riak.client.bucket.Bucket; |
| import java.io.IOException; |
| import java.io.Reader; |
| import java.io.StringReader; |
| import java.io.StringWriter; |
| import java.io.Writer; |
| import org.apache.zest.api.entity.EntityDescriptor; |
| import org.apache.zest.api.entity.EntityReference; |
| import org.apache.zest.api.service.ServiceActivation; |
| import org.apache.zest.io.Input; |
| import org.apache.zest.io.Output; |
| import org.apache.zest.io.Receiver; |
| import org.apache.zest.io.Sender; |
| import org.apache.zest.spi.entitystore.EntityNotFoundException; |
| import org.apache.zest.spi.entitystore.EntityStoreException; |
| import org.apache.zest.spi.entitystore.helpers.MapEntityStore; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Base Riak implementation of MapEntityStore. |
| */ |
| /* package */ abstract class AbstractRiakMapEntityStore |
| implements ServiceActivation, MapEntityStore, RiakAccessors |
| { |
| |
| protected static final Logger LOGGER = LoggerFactory.getLogger( "org.qi4j.entitystore.riak" ); |
| protected static final int DEFAULT_MAX_CONNECTIONS = 50; |
| |
| /* package */ static final String DEFAULT_BUCKET_KEY = "qi4j:entities"; |
| protected IRiakClient riakClient; |
| protected String bucketKey; |
| |
| @Override |
| public void passivateService() |
| throws Exception |
| { |
| riakClient.shutdown(); |
| riakClient = null; |
| bucketKey = null; |
| } |
| |
| @Override |
| public IRiakClient riakClient() |
| { |
| return riakClient; |
| } |
| |
| @Override |
| public String bucket() |
| { |
| return bucketKey; |
| } |
| |
| @Override |
| public Reader get( EntityReference entityReference ) |
| throws EntityStoreException |
| { |
| try |
| { |
| |
| Bucket bucket = riakClient.fetchBucket( bucketKey ).execute(); |
| IRiakObject entity = bucket.fetch( entityReference.identity() ).execute(); |
| if( entity == null ) |
| { |
| throw new EntityNotFoundException( entityReference ); |
| } |
| String jsonState = entity.getValueAsString(); |
| return new StringReader( jsonState ); |
| |
| } |
| catch( RiakRetryFailedException ex ) |
| { |
| throw new EntityStoreException( "Unable to get Entity " + entityReference.identity(), ex ); |
| } |
| } |
| |
| @Override |
| public void applyChanges( MapChanges changes ) |
| throws IOException |
| { |
| try |
| { |
| final Bucket bucket = riakClient.fetchBucket( bucketKey ).execute(); |
| |
| changes.visitMap( new MapChanger() |
| { |
| |
| @Override |
| public Writer newEntity( final EntityReference ref, EntityDescriptor entityDescriptor ) |
| throws IOException |
| { |
| return new StringWriter( 1000 ) |
| { |
| |
| @Override |
| public void close() |
| throws IOException |
| { |
| try |
| { |
| super.close(); |
| bucket.store( ref.identity(), toString() ).execute(); |
| } |
| catch( RiakException ex ) |
| { |
| throw new EntityStoreException( "Unable to apply entity change: newEntity", ex ); |
| } |
| } |
| |
| }; |
| } |
| |
| @Override |
| public Writer updateEntity( final EntityReference ref, EntityDescriptor entityDescriptor ) |
| throws IOException |
| { |
| return new StringWriter( 1000 ) |
| { |
| |
| @Override |
| public void close() |
| throws IOException |
| { |
| try |
| { |
| super.close(); |
| IRiakObject entity = bucket.fetch( ref.identity() ).execute(); |
| if( entity == null ) |
| { |
| throw new EntityNotFoundException( ref ); |
| } |
| bucket.store( ref.identity(), toString() ).execute(); |
| } |
| catch( RiakException ex ) |
| { |
| throw new EntityStoreException( "Unable to apply entity change: updateEntity", ex ); |
| } |
| } |
| |
| }; |
| } |
| |
| @Override |
| public void removeEntity( EntityReference ref, EntityDescriptor entityDescriptor ) |
| throws EntityNotFoundException |
| { |
| try |
| { |
| IRiakObject entity = bucket.fetch( ref.identity() ).execute(); |
| if( entity == null ) |
| { |
| throw new EntityNotFoundException( ref ); |
| } |
| bucket.delete( ref.identity() ).execute(); |
| } |
| catch( RiakException ex ) |
| { |
| throw new EntityStoreException( "Unable to apply entity change: removeEntity", ex ); |
| } |
| } |
| |
| } ); |
| |
| } |
| catch( RiakRetryFailedException ex ) |
| { |
| throw new EntityStoreException( "Unable to apply entity changes.", ex ); |
| } |
| } |
| |
| @Override |
| public Input<Reader, IOException> entityStates() |
| { |
| return new Input<Reader, IOException>() |
| { |
| |
| @Override |
| public <ReceiverThrowableType extends Throwable> void transferTo( Output<? super Reader, ReceiverThrowableType> output ) |
| throws IOException, ReceiverThrowableType |
| { |
| output.receiveFrom( new Sender<Reader, IOException>() |
| { |
| |
| @Override |
| public <ReceiverThrowableType extends Throwable> void sendTo( Receiver<? super Reader, ReceiverThrowableType> receiver ) |
| throws ReceiverThrowableType, IOException |
| { |
| try |
| { |
| final Bucket bucket = riakClient.fetchBucket( bucketKey ).execute(); |
| for( String key : bucket.keys() ) |
| { |
| String jsonState = bucket.fetch( key ).execute().getValueAsString(); |
| receiver.receive( new StringReader( jsonState ) ); |
| } |
| } |
| catch( RiakException ex ) |
| { |
| throw new EntityStoreException( "Unable to apply entity changes.", ex ); |
| } |
| } |
| |
| } ); |
| } |
| |
| }; |
| } |
| |
| } |