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Guice module, utilities etc to create injectors JOYn and A4A applications
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/*
* #%L
* %%
* Copyright (C) 2011 - 2017 BMW Car IT GmbH
* %%
* 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.
* #L%
*/
package io.joynr.guice;
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Module;
/**
* @param the kind of application module expected by the InjectorFactory. The application module provides the required information of the runtime environment
* @param the kind of application which shall be created by this InjectorFactoryF
*/
public class InjectorFactory {
// protected Logger logger = Logger.getLogger(getClass());
private Injector fInjector;
private Module[] modules;
private Injector rootInjector;
/**
* @param modules a list of modules to be used for the injector creation
*
* Basic constructor for the Injectorfactory
*/
public InjectorFactory(Module... modules) {
this.modules = modules;
}
/**
* @param upateModules the updateModules which replace the previously defined modules of the InjectorFactory
*/
public void updateModules(Module... upateModules) {
if (fInjector == null) {
this.modules = upateModules;
} else {
throw new RuntimeException("updateModules shall be invoked BEFORE the factory gets used for the first time!");
}
}
protected Module[] getModules() {
return modules;
}
/**
* @param applicationModule the mandatory application properties binded via this module
* @param applicationSpecificModules modules allowing to further configure the application specific injector used for the creation of the application
* @return a new instance of {@literal }
*/
@SuppressWarnings("unchecked")
public S createApplication(T applicationModule, Module... applicationSpecificModules) {
// Module applicationModule = activator.getApplicationSpecificModule(appId);
Module[] modules = new Module[applicationSpecificModules != null ? applicationSpecificModules.length + 1 : 1];
modules[0] = applicationModule;
if (applicationSpecificModules != null) {
for (int i = 0; i < applicationSpecificModules.length; i++) {
modules[i + 1] = applicationSpecificModules[i];
}
}
return (S) createChildInjector(modules).getInstance(IApplication.class);
}
/**
* @return a new instance of {@literal }
*
* Create a new instance of {@literal },
* based on the default injector configurations of the InjectorFactory
*/
@SuppressWarnings("unchecked")
public S createApplication() {
return (S) (createChildInjector().getInstance(IApplication.class));
}
/**
* @param rootInjector the new rootInjector
*
* Allows to adapt the root injector of the InjectorFactory
*/
protected void setRootInjector(Injector rootInjector) {
if (fInjector == null) {
this.rootInjector = rootInjector;
} else {
throw new RuntimeException("setRootInjector shall be invoked BEFORE the factory gets used for the first time!");
}
}
/**
* @return the injector created by the InjectorFactory based on the configured modules
*/
public Injector getInjector() {
if (fInjector == null) {
fInjector = rootInjector == null ? Guice.createInjector(modules)
: rootInjector.createChildInjector(modules);
}
return fInjector;
}
/**
* @param withModules modules used for the creation of the child injector
* @return a new injector which has been derived from the "main" injector of the InjectorFactory
*/
public Injector createChildInjector(Module... withModules) {
return getInjector().createChildInjector(withModules);
}
}