| /* |
| * Copyright (c) 2012-2014, Paul Merlin. All Rights Reserved. |
| * |
| * 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.jclouds; |
| |
| import com.google.common.collect.ImmutableSet; |
| import com.google.common.collect.Iterables; |
| import com.google.common.collect.Maps; |
| import com.google.common.io.ByteSource; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.io.Reader; |
| import java.io.StringReader; |
| import java.io.StringWriter; |
| import java.io.Writer; |
| import java.util.Map; |
| import java.util.Properties; |
| import java.util.Set; |
| import org.jclouds.ContextBuilder; |
| import org.jclouds.apis.ApiMetadata; |
| import org.jclouds.apis.Apis; |
| import org.jclouds.blobstore.BlobStore; |
| import org.jclouds.blobstore.BlobStoreContext; |
| import org.jclouds.blobstore.domain.Blob; |
| import org.jclouds.blobstore.domain.StorageMetadata; |
| import org.jclouds.io.Payload; |
| import org.jclouds.providers.ProviderMetadata; |
| import org.jclouds.providers.Providers; |
| import org.apache.zest.api.configuration.Configuration; |
| import org.apache.zest.api.entity.EntityDescriptor; |
| import org.apache.zest.api.entity.EntityReference; |
| import org.apache.zest.api.injection.scope.This; |
| import org.apache.zest.api.service.ServiceActivation; |
| import org.apache.zest.io.Input; |
| import org.apache.zest.io.Inputs; |
| import org.apache.zest.io.Output; |
| import org.apache.zest.io.Outputs; |
| 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; |
| |
| import static com.google.common.base.Charsets.UTF_8; |
| import static com.google.common.base.Preconditions.checkArgument; |
| import static com.google.common.collect.Iterables.contains; |
| import static org.apache.zest.api.entity.EntityReference.parseEntityReference; |
| |
| /** |
| * JClouds implementation of MapEntityStore. |
| */ |
| // TODO Expose Location in configuration |
| // To be done once JClouds 1.5 has stabilized their Location API. |
| // A list of ISO-3166 country codes. |
| // It defines where your entities are allowed to be stored. |
| // @UseDefaults Property<List<String>> geopoliticalBoundaries(); ??? |
| // SEE http://www.jclouds.org/documentation/reference/location-metadata-design |
| public class JCloudsMapEntityStoreMixin |
| implements ServiceActivation, MapEntityStore |
| { |
| |
| private static final Logger LOGGER = LoggerFactory.getLogger( "org.qi4j.entitystore.jclouds" ); |
| |
| private static final Map<String, ApiMetadata> allApis = Maps.uniqueIndex( |
| Apis.viewableAs( BlobStoreContext.class ), |
| Apis.idFunction() |
| ); |
| |
| private static final Map<String, ProviderMetadata> appProviders = Maps.uniqueIndex( |
| Providers.viewableAs( BlobStoreContext.class ), |
| Providers.idFunction() |
| ); |
| |
| private static final Set<String> allKeys = ImmutableSet.copyOf( |
| Iterables.concat( appProviders.keySet(), allApis.keySet() ) |
| ); |
| |
| @This |
| private Configuration<JCloudsMapEntityStoreConfiguration> configuration; |
| |
| private BlobStoreContext storeContext; |
| |
| private String container; |
| |
| @Override |
| public void activateService() |
| throws Exception |
| { |
| configuration.refresh(); |
| String provider = configuration.get().provider().get(); |
| String identifier = configuration.get().identifier().get(); |
| String credentials = configuration.get().credential().get(); |
| Map<String, String> properties = configuration.get().properties().get(); |
| container = configuration.get().container().get(); |
| if( provider != null ) |
| { |
| checkArgument( contains( allKeys, provider ), "provider %s not in supported list: %s", provider, allKeys ); |
| } |
| else |
| { |
| provider = "transient"; |
| } |
| if( container == null ) |
| { |
| container = "qi4j-entities"; |
| } |
| storeContext = ContextBuilder.newBuilder( provider ). |
| credentials( identifier, credentials ). |
| overrides( asProperties( properties ) ). |
| buildView( BlobStoreContext.class ); |
| BlobStore blobStore = storeContext.getBlobStore(); |
| if( !blobStore.containerExists( container ) ) |
| { |
| if( !blobStore.createContainerInLocation( null, container ) ) |
| { |
| throw new EntityStoreException( "Unable to create JClouds Blob Container, cannot continue." ); |
| } |
| else |
| { |
| LOGGER.debug( "Created new container: {}", container ); |
| } |
| } |
| LOGGER.info( "Activated using {} cloud provider [id:{}]", provider, identifier ); |
| } |
| |
| private Properties asProperties( Map<String, String> map ) |
| { |
| Properties props = new Properties(); |
| for( Map.Entry<String, String> eachEntry : map.entrySet() ) |
| { |
| props.put( eachEntry.getKey(), eachEntry.getValue() ); |
| } |
| return props; |
| } |
| |
| @Override |
| public void passivateService() |
| throws Exception |
| { |
| if( storeContext != null ) |
| { |
| storeContext.close(); |
| storeContext = null; |
| container = null; |
| } |
| } |
| |
| @Override |
| public Reader get( EntityReference entityReference ) |
| throws EntityStoreException |
| { |
| Blob blob = storeContext.getBlobStore().getBlob( container, entityReference.identity() ); |
| if( blob == null ) |
| { |
| throw new EntityNotFoundException( entityReference ); |
| } |
| Payload payload = blob.getPayload(); |
| if( payload == null ) |
| { |
| throw new EntityNotFoundException( entityReference ); |
| } |
| InputStream input = null; |
| try |
| { |
| input = payload.openStream(); |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| Inputs.byteBuffer( input, 4096 ).transferTo( Outputs.byteBuffer( baos ) ); |
| return new StringReader( baos.toString( "UTF-8" ) ); |
| } |
| catch( IOException ex ) |
| { |
| throw new EntityStoreException( "Unable to read entity state for: " + entityReference, ex ); |
| } |
| finally |
| { |
| if( input != null ) |
| { |
| try |
| { |
| input.close(); |
| } |
| catch( IOException ignored ) |
| { |
| } |
| } |
| } |
| } |
| |
| @Override |
| public void applyChanges( MapChanges changes ) |
| throws IOException |
| { |
| final BlobStore blobStore = storeContext.getBlobStore(); |
| changes.visitMap( |
| new MapChanger() |
| { |
| @Override |
| public Writer newEntity( final EntityReference ref, EntityDescriptor entityDescriptor ) |
| throws IOException |
| { |
| return new StringWriter() |
| { |
| @Override |
| public void close() |
| throws IOException |
| { |
| super.close(); |
| Blob blob = blobStore.blobBuilder( ref.identity() ) |
| .payload( ByteSource.wrap( toString().getBytes( UTF_8 ) ) ) |
| .build(); |
| blobStore.putBlob( container, blob ); |
| } |
| }; |
| } |
| |
| @Override |
| public Writer updateEntity( final EntityReference ref, EntityDescriptor entityDescriptor ) |
| throws IOException |
| { |
| if( !blobStore.blobExists( container, ref.identity() ) ) |
| { |
| throw new EntityNotFoundException( ref ); |
| } |
| return new StringWriter() |
| { |
| @Override |
| public void close() |
| throws IOException |
| { |
| super.close(); |
| Blob blob = blobStore.blobBuilder( ref.identity() ) |
| .payload( ByteSource.wrap( toString().getBytes( UTF_8 ) ) ) |
| .build(); |
| blobStore.putBlob( container, blob ); |
| } |
| }; |
| } |
| |
| @Override |
| public void removeEntity( EntityReference ref, EntityDescriptor entityDescriptor ) |
| throws EntityNotFoundException |
| { |
| if( !blobStore.blobExists( container, ref.identity() ) ) |
| { |
| throw new EntityNotFoundException( ref ); |
| } |
| blobStore.removeBlob( container, ref.identity() ); |
| } |
| } |
| ); |
| } |
| |
| @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 |
| { |
| for( StorageMetadata stored : storeContext.getBlobStore().list() ) |
| { |
| Payload payload = storeContext.getBlobStore().getBlob( container, stored.getName() ).getPayload(); |
| if( payload == null ) |
| { |
| throw new EntityNotFoundException( parseEntityReference( stored.getName() ) ); |
| } |
| InputStream input = null; |
| try |
| { |
| input = payload.openStream(); |
| receiver.receive( new InputStreamReader( input, "UTF-8" ) ); |
| } |
| finally |
| { |
| if( input != null ) |
| { |
| try |
| { |
| input.close(); |
| } |
| catch( IOException ignored ) |
| { |
| } |
| } |
| } |
| } |
| } |
| } |
| ); |
| } |
| }; |
| } |
| } |
