| /* |
| * 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.qi4j.entitystore.redis; |
| |
| import java.io.IOException; |
| import java.io.Reader; |
| import java.io.StringReader; |
| import java.io.StringWriter; |
| import java.io.Writer; |
| import java.util.Set; |
| import org.qi4j.api.configuration.Configuration; |
| import org.qi4j.api.entity.EntityDescriptor; |
| import org.qi4j.api.entity.EntityReference; |
| import org.qi4j.api.injection.scope.This; |
| import org.qi4j.api.service.ServiceActivation; |
| import org.qi4j.io.Input; |
| import org.qi4j.io.Output; |
| import org.qi4j.io.Receiver; |
| import org.qi4j.io.Sender; |
| import org.qi4j.spi.entitystore.EntityAlreadyExistsException; |
| import org.qi4j.spi.entitystore.EntityNotFoundException; |
| import org.qi4j.spi.entitystore.EntityStoreException; |
| import org.qi4j.spi.entitystore.helpers.MapEntityStore; |
| import redis.clients.jedis.Jedis; |
| import redis.clients.jedis.JedisPool; |
| import redis.clients.jedis.JedisPoolConfig; |
| import redis.clients.jedis.Protocol; |
| |
| /** |
| * Redis implementation of MapEntityStore. |
| */ |
| public class RedisMapEntityStoreMixin |
| implements ServiceActivation, RedisAccessors, MapEntityStore |
| { |
| private static final String DEFAULT_HOST = "127.0.0.1"; |
| private static final String NIL = "nil"; |
| @This |
| private Configuration<RedisEntityStoreConfiguration> configuration; |
| private JedisPool pool; |
| |
| @Override |
| public void activateService() |
| throws Exception |
| { |
| configuration.refresh(); |
| RedisEntityStoreConfiguration config = configuration.get(); |
| |
| String host = config.host().get() == null ? DEFAULT_HOST : config.host().get(); |
| int port = config.port().get() == null ? Protocol.DEFAULT_PORT : config.port().get(); |
| int timeout = config.timeout().get() == null ? Protocol.DEFAULT_TIMEOUT : config.timeout().get(); |
| String password = config.password().get(); |
| int database = config.database().get() == null ? Protocol.DEFAULT_DATABASE : config.database().get(); |
| |
| pool = new JedisPool( new JedisPoolConfig(), host, port, timeout, password, database ); |
| } |
| |
| @Override |
| public void passivateService() |
| throws Exception |
| { |
| pool.destroy(); |
| pool = null; |
| } |
| |
| @Override |
| public JedisPool jedisPool() |
| { |
| return pool; |
| } |
| |
| @Override |
| public Reader get( EntityReference entityReference ) |
| throws EntityStoreException |
| { |
| Jedis jedis = pool.getResource(); |
| try |
| { |
| String jsonState = jedis.get( entityReference.identity() ); |
| if( notFound( jsonState ) ) |
| { |
| throw new EntityNotFoundException( entityReference ); |
| } |
| return new StringReader( jsonState ); |
| } |
| finally |
| { |
| pool.returnResource( jedis ); |
| } |
| } |
| |
| @Override |
| public void applyChanges( MapChanges changes ) |
| throws IOException |
| { |
| final Jedis jedis = pool.getResource(); |
| try |
| { |
| 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 |
| { |
| super.close(); |
| String statusCode = jedis.set( ref.identity(), toString(), "NX" ); |
| if( !"OK".equals( statusCode ) ) |
| { |
| throw new EntityAlreadyExistsException( ref ); |
| } |
| } |
| }; |
| } |
| |
| @Override |
| public Writer updateEntity( final EntityReference ref, EntityDescriptor entityDescriptor ) |
| throws IOException |
| { |
| return new StringWriter( 1000 ) |
| { |
| @Override |
| public void close() |
| throws IOException |
| { |
| super.close(); |
| String statusCode = jedis.set( ref.identity(), toString(), "XX" ); |
| if( !"OK".equals( statusCode ) ) |
| { |
| throw new EntityNotFoundException( ref ); |
| } |
| } |
| }; |
| } |
| |
| @Override |
| public void removeEntity( EntityReference ref, EntityDescriptor entityDescriptor ) |
| throws EntityNotFoundException |
| { |
| String jsonState = jedis.get( ref.identity() ); |
| if( notFound( jsonState ) ) |
| { |
| throw new EntityNotFoundException( ref ); |
| } |
| jedis.del( ref.identity() ); |
| } |
| } ); |
| } |
| finally |
| { |
| pool.returnResource( jedis ); |
| } |
| } |
| |
| @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 |
| { |
| Jedis jedis = pool.getResource(); |
| try |
| { |
| Set<String> keys = jedis.keys( "*" ); |
| for( String key : keys ) |
| { |
| String jsonState = jedis.get( key ); |
| receiver.receive( new StringReader( jsonState ) ); |
| } |
| } |
| finally |
| { |
| pool.returnResource( jedis ); |
| } |
| } |
| } ); |
| } |
| }; |
| } |
| |
| private static boolean notFound( String jsonState ) |
| { |
| return jsonState == null || NIL.equals( jsonState ); |
| } |
| } |