| /* |
| * Copyright (c) 2009, Rickard Öberg. 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.qi4j.runtime.service; |
| |
| import java.lang.reflect.Proxy; |
| import org.qi4j.api.activation.Activation; |
| import org.qi4j.api.activation.ActivationException; |
| import org.qi4j.api.activation.PassivationException; |
| import org.qi4j.api.configuration.Configuration; |
| import org.qi4j.api.configuration.Enabled; |
| import org.qi4j.api.service.Availability; |
| import org.qi4j.api.service.ServiceComposite; |
| import org.qi4j.api.util.Classes; |
| import org.qi4j.runtime.composite.TransientInstance; |
| import org.qi4j.runtime.composite.TransientStateInstance; |
| import org.qi4j.runtime.structure.ModuleInstance; |
| |
| /** |
| * JAVADOC |
| */ |
| public class ServiceInstance |
| extends TransientInstance |
| implements Activation |
| { |
| public static TransientInstance serviceInstanceOf( ServiceComposite composite ) |
| { |
| return (TransientInstance) Proxy.getInvocationHandler( composite ); |
| } |
| |
| private final boolean implementsServiceAvailable; |
| private final boolean hasEnabledConfiguration; |
| |
| public ServiceInstance( ServiceModel compositeModel, |
| ModuleInstance moduleInstance, |
| Object[] mixins, |
| TransientStateInstance state |
| ) |
| { |
| super( compositeModel, moduleInstance, mixins, state ); |
| |
| implementsServiceAvailable = |
| Classes.assignableTypeSpecification( Availability.class ).satisfiedBy( descriptor() ); |
| hasEnabledConfiguration = compositeModel.configurationType() != null |
| && Enabled.class.isAssignableFrom( compositeModel.configurationType() ); |
| } |
| |
| @Override |
| public void activate() |
| throws ActivationException |
| { |
| // NOOP |
| } |
| |
| @Override |
| public void passivate() |
| throws PassivationException |
| { |
| // NOOP |
| } |
| |
| @SuppressWarnings( "unchecked" ) |
| public boolean isAvailable() |
| { |
| // Check Enabled in configuration first |
| if( hasEnabledConfiguration && !( (Configuration<Enabled>) proxy() ).get().enabled().get() ) |
| { |
| return false; |
| } |
| |
| // Ask service if it's available |
| return !implementsServiceAvailable || ( (Availability) proxy() ).isAvailable(); |
| } |
| } |