| /* |
| * 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.spi.entitystore.helpers; |
| |
| import java.io.BufferedReader; |
| import java.io.Externalizable; |
| import java.io.IOException; |
| import java.io.ObjectInput; |
| import java.io.ObjectOutput; |
| import java.io.Reader; |
| import java.io.StringReader; |
| import java.io.Writer; |
| import java.time.Instant; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.UUID; |
| import java.util.function.Function; |
| import java.util.stream.Stream; |
| import javax.json.JsonObject; |
| import javax.json.JsonObjectBuilder; |
| import javax.json.JsonReader; |
| import org.apache.polygene.api.cache.CacheOptions; |
| import org.apache.polygene.api.common.Optional; |
| import org.apache.polygene.api.entity.EntityDescriptor; |
| import org.apache.polygene.api.entity.EntityReference; |
| import org.apache.polygene.api.identity.Identity; |
| import org.apache.polygene.api.identity.IdentityGenerator; |
| import org.apache.polygene.api.identity.StringIdentity; |
| import org.apache.polygene.api.injection.scope.Service; |
| import org.apache.polygene.api.injection.scope.Structure; |
| import org.apache.polygene.api.injection.scope.This; |
| import org.apache.polygene.api.injection.scope.Uses; |
| import org.apache.polygene.api.service.ServiceDescriptor; |
| import org.apache.polygene.api.structure.Application; |
| import org.apache.polygene.api.structure.ModuleDescriptor; |
| import org.apache.polygene.api.unitofwork.NoSuchEntityTypeException; |
| import org.apache.polygene.api.usecase.Usecase; |
| import org.apache.polygene.serialization.javaxjson.JavaxJsonFactories; |
| import org.apache.polygene.spi.cache.Cache; |
| import org.apache.polygene.spi.cache.CachePool; |
| import org.apache.polygene.spi.cache.NullCache; |
| import org.apache.polygene.spi.entity.EntityState; |
| import org.apache.polygene.spi.entity.EntityStatus; |
| import org.apache.polygene.spi.entitystore.DefaultEntityStoreUnitOfWork; |
| import org.apache.polygene.spi.entitystore.EntityStore; |
| import org.apache.polygene.spi.entitystore.EntityStoreException; |
| import org.apache.polygene.spi.entitystore.EntityStoreSPI; |
| import org.apache.polygene.spi.entitystore.EntityStoreUnitOfWork; |
| import org.apache.polygene.spi.entitystore.StateCommitter; |
| import org.apache.polygene.spi.serialization.JsonSerialization; |
| |
| import static java.util.stream.Collectors.joining; |
| |
| /** |
| * Implementation of EntityStore that works with an implementation of MapEntityStore. |
| * |
| * <p>Implement {@link MapEntityStore} and add as mixin to the service using this mixin.</p> |
| * <p>See {@link org.apache.polygene.entitystore.memory.MemoryMapEntityStoreMixin} for reference.</p> |
| * <p>EntityStores based on this mixin gets support for the <b>Migration</b> and <b>Cache</b> extensions.</p> |
| * <p>MapEntityStore implementations will get their values as JSON.</p> |
| */ |
| public class JSONMapEntityStoreMixin |
| implements EntityStore, EntityStoreSPI, StateStore, JSONMapEntityStoreActivation |
| { |
| @This |
| private MapEntityStore mapEntityStore; |
| |
| @This |
| private EntityStoreSPI entityStoreSpi; |
| |
| @Structure |
| private Application application; |
| |
| @Service |
| private JsonSerialization serialization; |
| |
| @Service |
| private JavaxJsonFactories jsonFactories; |
| |
| @Service |
| private IdentityGenerator identityGenerator; |
| |
| @Optional |
| @Service |
| private Migration migration; |
| |
| @Uses |
| private ServiceDescriptor descriptor; |
| |
| @Optional |
| @Service |
| private CachePool caching; |
| private Cache<CacheState> cache; |
| |
| protected String uuid; |
| |
| public JSONMapEntityStoreMixin() |
| { |
| } |
| |
| @Override |
| public void setUpJSONMapES() |
| throws Exception |
| { |
| uuid = descriptor.identity() + "-" + UUID.randomUUID().toString(); |
| if( caching != null ) |
| { |
| cache = caching.fetchCache( uuid, CacheState.class ); |
| } |
| else |
| { |
| cache = new NullCache<>(); |
| } |
| } |
| |
| @Override |
| public void tearDownJSONMapES() |
| throws Exception |
| { |
| if( caching != null ) |
| { |
| caching.returnCache( cache ); |
| cache = null; |
| } |
| } |
| |
| // EntityStore |
| |
| @Override |
| public EntityStoreUnitOfWork newUnitOfWork( ModuleDescriptor module, Usecase usecase, Instant currentTime ) |
| { |
| return new DefaultEntityStoreUnitOfWork( module, entityStoreSpi, newUnitOfWorkId(), usecase, currentTime ); |
| } |
| |
| // EntityStoreSPI |
| |
| @Override |
| public EntityState newEntityState( EntityStoreUnitOfWork uow, |
| EntityReference reference, |
| EntityDescriptor entityDescriptor |
| ) |
| { |
| try |
| { |
| JsonObjectBuilder builder = jsonFactories.builderFactory().createObjectBuilder(); |
| builder.add( JSONKeys.IDENTITY, reference.identity().toString() ); |
| builder.add( JSONKeys.APPLICATION_VERSION, application.version() ); |
| builder.add( JSONKeys.TYPE, entityDescriptor.types().findFirst().get().getName() ); |
| builder.add( JSONKeys.VERSION, uow.identity().toString() ); |
| builder.add( JSONKeys.MODIFIED, uow.currentTime().toEpochMilli() ); |
| builder.add( JSONKeys.VALUE, jsonFactories.builderFactory().createObjectBuilder().build() ); |
| JsonObject state = builder.build(); |
| return new JSONEntityState( entityDescriptor.module(), serialization, jsonFactories, |
| uow.identity().toString(), uow.currentTime(), |
| reference, |
| EntityStatus.NEW, entityDescriptor, |
| state ); |
| } |
| catch( Exception e ) |
| { |
| throw new EntityStoreException( e ); |
| } |
| } |
| |
| @Override |
| public synchronized EntityState entityStateOf( EntityStoreUnitOfWork uow, |
| ModuleDescriptor module, |
| EntityReference reference ) |
| { |
| try |
| { |
| EntityState state = fetchCachedState( reference, module, uow.currentTime() ); |
| if( state != null ) |
| { |
| return state; |
| } |
| // Get state |
| try( Reader in = mapEntityStore.get( reference ) ) |
| { |
| JSONEntityState loadedState = readEntityState( module, in ); |
| if( loadedState.status() == EntityStatus.UPDATED ) |
| { |
| List<JSONEntityState> migrated = new ArrayList<>( 1 ); |
| migrated.add( loadedState ); |
| synchMigratedEntities( migrated ); |
| } |
| if( doCacheOnRead( uow ) ) |
| { |
| cache.put( reference.identity().toString(), new CacheState( loadedState.state().toString() ) ); |
| } |
| return loadedState; |
| } |
| } |
| catch( EntityStoreException ex ) |
| { |
| throw ex; |
| } |
| catch( Exception ex ) |
| { |
| throw new EntityStoreException( ex ); |
| } |
| } |
| |
| @Override |
| public synchronized String versionOf( EntityStoreUnitOfWork uow, EntityReference reference ) |
| { |
| CacheState cacheState = cache.get( reference.identity().toString() ); |
| if( cacheState != null ) |
| { |
| return jsonFactories.readerFactory().createReader( new StringReader( cacheState.string ) ).readObject() |
| .getString( JSONKeys.VERSION ); |
| } |
| // Get state |
| try( JsonReader reader = jsonFactories.readerFactory().createReader( mapEntityStore.get( reference ) ) ) |
| { |
| return reader.readObject().getString( JSONKeys.VERSION ); |
| } |
| catch( EntityStoreException ex ) |
| { |
| throw ex; |
| } |
| catch( Exception ex ) |
| { |
| throw new EntityStoreException( ex ); |
| } |
| } |
| |
| @Override |
| public StateCommitter applyChanges( EntityStoreUnitOfWork uow, Iterable<EntityState> entityStates ) |
| throws EntityStoreException |
| { |
| return new StateCommitter() |
| { |
| @Override |
| public void commit() |
| { |
| try |
| { |
| mapEntityStore.applyChanges( |
| changer -> |
| { |
| CacheOptions options = uow.usecase().metaInfo( CacheOptions.class ); |
| if( options == null ) |
| { |
| options = CacheOptions.ALWAYS; |
| } |
| |
| for( EntityState entityState : entityStates ) |
| { |
| JSONEntityState state = (JSONEntityState) entityState; |
| String newVersion = uow.identity().toString(); |
| Instant lastModified = uow.currentTime(); |
| if( state.status().equals( EntityStatus.NEW ) ) |
| { |
| try( Writer writer = changer.newEntity( state.entityReference(), |
| state.entityDescriptor() ) ) |
| { |
| writeEntityState( state, writer, newVersion, lastModified ); |
| } |
| if( options.cacheOnNew() ) |
| { |
| cache.put( state.entityReference().identity().toString(), |
| new CacheState( state.state().toString() ) ); |
| } |
| } |
| else if( state.status().equals( EntityStatus.UPDATED ) ) |
| { |
| MapEntityStore.MapChange mapChange = new MapEntityStore.MapChange( |
| state.entityReference(), state.entityDescriptor(), |
| state.version(), newVersion, lastModified |
| ); |
| try( Writer writer = changer.updateEntity( mapChange ) ) |
| { |
| writeEntityState( state, writer, newVersion, lastModified ); |
| } |
| if( options.cacheOnWrite() ) |
| { |
| cache.put( state.entityReference().identity().toString(), |
| new CacheState( state.state().toString() ) ); |
| } |
| } |
| else if( state.status().equals( EntityStatus.REMOVED ) ) |
| { |
| changer.removeEntity( state.entityReference(), state.entityDescriptor() ); |
| cache.remove( state.entityReference().identity().toString() ); |
| } |
| } |
| } ); |
| } |
| catch( Exception e ) |
| { |
| throw new EntityStoreException( e ); |
| } |
| } |
| |
| @Override |
| public void cancel() |
| { |
| } |
| }; |
| } |
| |
| @Override |
| public Stream<EntityState> entityStates( ModuleDescriptor module ) |
| { |
| try |
| { |
| Stream<Reader> stateStream = mapEntityStore.entityStates(); |
| List<JSONEntityState> migrated = new ArrayList<>(); |
| Function<Reader, EntityState> function = reader -> |
| { |
| JSONEntityState entity = readEntityState( module, reader ); |
| if( entity.status() == EntityStatus.UPDATED ) |
| { |
| migrated.add( entity ); |
| // Synch back 100 at a time |
| if( migrated.size() > 100 ) |
| { |
| synchMigratedEntities( migrated ); |
| } |
| } |
| return entity; |
| }; |
| Runnable closer = () -> |
| { |
| // Synch any remaining migrated entities |
| if( !migrated.isEmpty() ) |
| { |
| synchMigratedEntities( migrated ); |
| } |
| }; |
| return stateStream.map( function ).onClose( closer ); |
| } |
| catch( EntityStoreException ex ) |
| { |
| throw ex; |
| } |
| catch( Exception ex ) |
| { |
| throw new EntityStoreException( ex ); |
| } |
| } |
| |
| private void synchMigratedEntities( List<JSONEntityState> migratedEntities ) |
| { |
| try |
| { |
| mapEntityStore.applyChanges( |
| changer -> |
| { |
| for( JSONEntityState state : migratedEntities ) |
| { |
| Instant lastModified = state.lastModified(); |
| String version = state.version(); |
| MapEntityStore.MapChange changeInfo = new MapEntityStore.MapChange( |
| state.entityReference(), state.entityDescriptor(), |
| version, version, lastModified |
| ); |
| try( Writer writer = changer.updateEntity( changeInfo ) ) |
| { |
| writeEntityState( state, writer, version, lastModified ); |
| } |
| } |
| } ); |
| migratedEntities.clear(); |
| } |
| catch( EntityStoreException ex ) |
| { |
| throw ex; |
| } |
| catch( Exception ex ) |
| { |
| throw new EntityStoreException( "Synchronization of Migrated Entities failed.", ex ); |
| } |
| } |
| |
| protected Identity newUnitOfWorkId() |
| { |
| return identityGenerator.generate( EntityStore.class ); |
| } |
| |
| protected void writeEntityState( JSONEntityState state, Writer writer, String version, Instant lastModified ) |
| throws EntityStoreException |
| { |
| try |
| { |
| state.stateCloneWithVersionAndModified( version, lastModified ); |
| writer.append( state.state().toString() ); |
| } |
| catch( IOException e ) |
| { |
| throw new EntityStoreException( "Could not store EntityState", e ); |
| } |
| } |
| |
| protected JSONEntityState readEntityState( ModuleDescriptor module, Reader entityState ) |
| throws EntityStoreException |
| { |
| try( JsonReader reader = jsonFactories.readerFactory().createReader( entityState ) ) |
| { |
| JsonObject parsedState = reader.readObject(); |
| JsonObjectBuilder jsonStateBuilder = jsonFactories.cloneBuilder( parsedState ); |
| EntityStatus status = EntityStatus.LOADED; |
| |
| String version = parsedState.getString( JSONKeys.VERSION ); |
| Instant modified = Instant.ofEpochMilli( parsedState.getJsonNumber( JSONKeys.MODIFIED ).longValueExact() ); |
| Identity identity = StringIdentity.identity( parsedState.getString( JSONKeys.IDENTITY ) ); |
| |
| // Check if version is correct |
| JsonObject state; |
| String currentAppVersion = parsedState.getString( JSONKeys.APPLICATION_VERSION, "0.0" ); |
| if( currentAppVersion.equals( application.version() ) ) |
| { |
| state = jsonStateBuilder.build(); |
| } |
| else |
| { |
| if( migration != null ) |
| { |
| state = migration.migrate( jsonStateBuilder.build(), application.version(), this ); |
| } |
| else |
| { |
| // Do nothing - set version to be correct |
| jsonStateBuilder.add( JSONKeys.APPLICATION_VERSION, application.version() ); |
| state = jsonStateBuilder.build(); |
| } |
| // State changed |
| status = EntityStatus.UPDATED; |
| } |
| |
| String type = state.getString( JSONKeys.TYPE ); |
| |
| EntityDescriptor entityDescriptor = module.entityDescriptor( type ); |
| if( entityDescriptor == null ) |
| { |
| throw new NoSuchEntityTypeException( type, module.name(), module.typeLookup() ); |
| } |
| |
| return new JSONEntityState( entityDescriptor.module(), serialization, jsonFactories, |
| version, modified, |
| EntityReference.create( identity ), |
| status, entityDescriptor, |
| state |
| ); |
| } |
| catch( EntityStoreException ex ) |
| { |
| throw ex; |
| } |
| catch( Exception ex ) |
| { |
| throw new EntityStoreException( ex ); |
| } |
| } |
| |
| @Override |
| public JsonObject jsonStateOf( String id ) |
| { |
| try( JsonReader jsonReader = jsonFactories |
| .readerFactory().createReader( mapEntityStore.get( EntityReference.parseEntityReference( id ) ) ) ) |
| { |
| return jsonReader.readObject(); |
| } |
| catch( EntityStoreException ex ) |
| { |
| throw ex; |
| } |
| catch( Exception ex ) |
| { |
| throw new EntityStoreException( ex ); |
| } |
| } |
| |
| private EntityState fetchCachedState( EntityReference reference, ModuleDescriptor module, Instant currentTime ) |
| { |
| CacheState cacheState = cache.get( reference.identity().toString() ); |
| if( cacheState != null ) |
| { |
| JsonObject state = jsonFactories.readerFactory().createReader( new StringReader( cacheState.string ) ) |
| .readObject(); |
| try |
| { |
| String type = state.getString( JSONKeys.TYPE ); |
| EntityDescriptor entityDescriptor = module.entityDescriptor( type ); |
| String version = state.getString( JSONKeys.VERSION ); |
| Instant modified = Instant.ofEpochMilli( state.getJsonNumber( JSONKeys.MODIFIED ).longValueExact() ); |
| return new JSONEntityState( entityDescriptor.module(), serialization, jsonFactories, |
| version, modified, |
| reference, |
| EntityStatus.LOADED, entityDescriptor, |
| state ); |
| } |
| catch( Exception e ) |
| { |
| // Should not be able to happen, unless internal error in the cache system. |
| throw new EntityStoreException( e ); |
| } |
| } |
| return null; |
| } |
| |
| private boolean doCacheOnRead( EntityStoreUnitOfWork unitOfWork ) |
| { |
| CacheOptions cacheOptions = unitOfWork.usecase().metaInfo( CacheOptions.class ); |
| return cacheOptions == null || cacheOptions.cacheOnRead(); |
| } |
| |
| public static class CacheState |
| implements Externalizable |
| { |
| public String string; |
| |
| public CacheState() |
| { |
| } |
| |
| private CacheState( String string ) |
| { |
| this.string = string; |
| } |
| |
| @Override |
| public void writeExternal( ObjectOutput out ) |
| throws IOException |
| { |
| out.writeUTF( string ); |
| } |
| |
| @Override |
| public void readExternal( ObjectInput in ) |
| throws IOException, ClassNotFoundException |
| { |
| try( BufferedReader reader = new BufferedReader( new StringReader( in.readUTF() ) ) ) |
| { |
| string = reader.lines().collect( joining( "\n" ) ); |
| } |
| } |
| } |
| } |