| /* |
| * 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.polygene.entitystore.leveldb; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.Reader; |
| import java.io.StringReader; |
| import java.io.StringWriter; |
| import java.io.Writer; |
| import java.nio.charset.Charset; |
| import java.util.Spliterator; |
| import java.util.Spliterators; |
| import java.util.function.Consumer; |
| import java.util.stream.Stream; |
| import java.util.stream.StreamSupport; |
| import org.apache.polygene.api.configuration.Configuration; |
| import org.apache.polygene.api.entity.EntityDescriptor; |
| import org.apache.polygene.api.entity.EntityReference; |
| import org.apache.polygene.api.injection.scope.Service; |
| import org.apache.polygene.api.injection.scope.This; |
| import org.apache.polygene.api.injection.scope.Uses; |
| import org.apache.polygene.api.service.ServiceActivation; |
| import org.apache.polygene.api.service.ServiceDescriptor; |
| import org.apache.polygene.library.fileconfig.FileConfiguration; |
| import org.apache.polygene.spi.entitystore.EntityNotFoundException; |
| import org.apache.polygene.spi.entitystore.EntityStoreException; |
| import org.apache.polygene.spi.entitystore.helpers.MapEntityStore; |
| import org.iq80.leveldb.CompressionType; |
| import org.iq80.leveldb.DB; |
| import org.iq80.leveldb.DBFactory; |
| import org.iq80.leveldb.DBIterator; |
| import org.iq80.leveldb.Options; |
| import org.iq80.leveldb.WriteBatch; |
| |
| /** |
| * LevelDB implementation of MapEntityStore. |
| */ |
| public class LevelDBEntityStoreMixin |
| implements ServiceActivation, MapEntityStore |
| { |
| |
| @Service |
| private FileConfiguration fileConfig; |
| @This |
| private Configuration<LevelDBEntityStoreConfiguration> configuration; |
| @Uses |
| private ServiceDescriptor descriptor; |
| private Charset charset; |
| private DB db; |
| |
| @Override |
| public void activateService() |
| throws Exception |
| { |
| charset = Charset.forName( "UTF-8" ); |
| configuration.refresh(); |
| LevelDBEntityStoreConfiguration config = configuration.get(); |
| |
| // Choose flavour |
| String flavour = config.flavour().get(); |
| DBFactory factory; |
| if( "jni".equalsIgnoreCase( flavour ) ) |
| { |
| factory = newJniDBFactory(); |
| } |
| else if( "java".equalsIgnoreCase( flavour ) ) |
| { |
| factory = newJavaDBFactory(); |
| } |
| else |
| { |
| factory = newDBFactory(); |
| } |
| |
| // Apply configuration |
| Options options = new Options(); |
| options.createIfMissing( true ); |
| if( config.blockRestartInterval().get() != null ) |
| { |
| options.blockRestartInterval( config.blockRestartInterval().get() ); |
| } |
| if( config.blockSize().get() != null ) |
| { |
| options.blockSize( config.blockSize().get() ); |
| } |
| if( config.cacheSize().get() != null ) |
| { |
| options.cacheSize( config.cacheSize().get() ); |
| } |
| if( config.compression().get() != null ) |
| { |
| options.compressionType( config.compression().get() |
| ? CompressionType.SNAPPY |
| : CompressionType.NONE ); |
| } |
| if( config.maxOpenFiles().get() != null ) |
| { |
| options.maxOpenFiles( config.maxOpenFiles().get() ); |
| } |
| if( config.paranoidChecks().get() != null ) |
| { |
| options.paranoidChecks( config.paranoidChecks().get() ); |
| } |
| if( config.verifyChecksums().get() != null ) |
| { |
| options.verifyChecksums( config.verifyChecksums().get() ); |
| } |
| if( config.writeBufferSize().get() != null ) |
| { |
| options.writeBufferSize( config.writeBufferSize().get() ); |
| } |
| |
| // Open/Create the database |
| File dbFile = new File( fileConfig.dataDirectory(), descriptor.identity().toString() ); |
| db = factory.open( dbFile, options ); |
| } |
| |
| /** |
| * Tries in order: JNI and then pure Java LevelDB implementations. |
| */ |
| private DBFactory newDBFactory() |
| { |
| try |
| { |
| return newJniDBFactory(); |
| } |
| catch( Exception ex ) |
| { |
| try |
| { |
| return newJavaDBFactory(); |
| } |
| catch( Exception ex2 ) |
| { |
| throw new RuntimeException( "Unable to create a LevelDB DBFactory instance. " |
| + "Tried JNI and pure Java. " |
| + "The stacktrace is the pure Java attempt.", ex2 ); |
| } |
| } |
| } |
| |
| private DBFactory newJniDBFactory() |
| throws Exception |
| { |
| return (DBFactory) Class.forName( "org.fusesource.leveldbjni.JniDBFactory" ).newInstance(); |
| } |
| |
| private DBFactory newJavaDBFactory() |
| throws Exception |
| { |
| return (DBFactory) Class.forName( "org.iq80.leveldb.impl.Iq80DBFactory" ).newInstance(); |
| } |
| |
| @Override |
| public void passivateService() |
| throws Exception |
| { |
| try |
| { |
| db.close(); |
| } |
| finally |
| { |
| db = null; |
| charset = null; |
| } |
| } |
| |
| @Override |
| public Reader get( EntityReference entityReference ) |
| throws EntityStoreException |
| { |
| byte[] state = db.get( entityReference.identity().toString().getBytes( charset ) ); |
| if( state == null ) |
| { |
| throw new EntityNotFoundException( entityReference ); |
| } |
| String jsonState = new String( state, charset ); |
| return new StringReader( jsonState ); |
| } |
| |
| @Override |
| public Stream<Reader> entityStates() |
| { |
| DBIterator iterator = db.iterator(); |
| iterator.seekToFirst(); |
| return StreamSupport.stream( |
| new Spliterators.AbstractSpliterator<Reader>( Long.MAX_VALUE, Spliterator.ORDERED ) |
| { |
| @Override |
| public boolean tryAdvance( final Consumer<? super Reader> action ) |
| { |
| if( !iterator.hasNext() ) |
| { |
| return false; |
| } |
| action.accept( new StringReader( new String( iterator.next().getValue(), charset ) ) ); |
| return true; |
| } |
| }, |
| false |
| ).onClose( |
| () -> |
| { |
| try |
| { |
| iterator.close(); |
| } |
| catch( IOException ex ) |
| { |
| throw new EntityStoreException( "Unable to close DB iterator" ); |
| } |
| } |
| ); |
| } |
| |
| @Override |
| public void applyChanges( MapChanges changes ) |
| throws Exception |
| { |
| final WriteBatch writeBatch = db.createWriteBatch(); |
| try |
| { |
| changes.visitMap( new MapChanger() |
| { |
| |
| @Override |
| public Writer newEntity( EntityReference ref, EntityDescriptor entityDescriptor ) |
| throws IOException |
| { |
| return new StringWriter( 1000 ) |
| { |
| |
| @Override |
| public void close() |
| throws IOException |
| { |
| super.close(); |
| String jsonState = toString(); |
| writeBatch.put( ref.identity().toString().getBytes( charset ), jsonState.getBytes( charset ) ); |
| } |
| |
| }; |
| } |
| |
| @Override |
| public Writer updateEntity( MapChange mapChange ) |
| throws IOException |
| { |
| return new StringWriter( 1000 ) |
| { |
| |
| @Override |
| public void close() |
| throws IOException |
| { |
| super.close(); |
| String jsonState = toString(); |
| writeBatch.put( mapChange.reference().identity().toString().getBytes( charset ), |
| jsonState.getBytes( charset ) ); |
| } |
| |
| }; |
| } |
| |
| @Override |
| public void removeEntity( EntityReference ref, EntityDescriptor entityDescriptor ) |
| throws EntityNotFoundException |
| { |
| writeBatch.delete( ref.identity().toString().getBytes( charset ) ); |
| } |
| |
| } ); |
| db.write( writeBatch ); |
| } |
| finally |
| { |
| writeBatch.close(); |
| } |
| } |
| |
| } |