Java tutorial
/** * Copyright (C) 2015 The Gravitee team (http://gravitee.io) * * 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 io.gravitee.management.idp.core.plugin; import io.gravitee.management.idp.api.IdentityProvider; import io.gravitee.plugin.core.api.PluginClassLoaderFactory; import io.gravitee.plugin.core.api.Plugin; import io.gravitee.plugin.core.api.PluginHandler; import io.gravitee.plugin.core.api.PluginType; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.util.Assert; /** * @author David BRASSELY (david at gravitee.io) * @author GraviteeSource Team */ public class IdentityProviderPluginHandler implements PluginHandler { private final static Logger LOGGER = LoggerFactory.getLogger(IdentityProviderPluginHandler.class); @Autowired private PluginClassLoaderFactory pluginClassLoaderFactory; @Autowired private IdentityProviderManager identityProviderManager; @Override public boolean canHandle(Plugin plugin) { return plugin.type() == PluginType.IDENTITY_PROVIDER; } @Override public void handle(Plugin plugin) { try { ClassLoader classloader = pluginClassLoaderFactory.getOrCreateClassLoader(plugin, this.getClass().getClassLoader()); final Class<?> identityProviderClass = classloader.loadClass(plugin.clazz()); LOGGER.info("Register a new identity provider plugin: {} [{}]", plugin.id(), plugin.clazz()); Assert.isAssignable(IdentityProvider.class, identityProviderClass); IdentityProvider identityIdentityProvider = createInstance( (Class<IdentityProvider>) identityProviderClass); identityProviderManager.register(new IdentityProviderDefinition(identityIdentityProvider, plugin)); } catch (Exception iae) { LOGGER.error("Unexpected error while create identity provider instance", iae); } } private <T> T createInstance(Class<T> clazz) throws Exception { try { return clazz.newInstance(); } catch (InstantiationException | IllegalAccessException ex) { LOGGER.error("Unable to instantiate class: {}", ex); throw ex; } } }