qpid/java/broker/src/main/java/org/apache/qpid/server/configuration/startup/PluginRecoverer.java


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/*
 *
 * 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.qpid.server.configuration.startup;

import java.util.Map;
import java.util.UUID;

import org.apache.qpid.server.configuration.ConfigurationEntry;
import org.apache.qpid.server.configuration.IllegalConfigurationException;
import org.apache.qpid.server.configuration.RecovererProvider;
import org.apache.qpid.server.model.Broker;
import org.apache.qpid.server.model.ConfiguredObject;
import org.apache.qpid.server.plugin.PluginFactory;
import org.apache.qpid.server.plugin.QpidServiceLoader;

public class PluginRecoverer extends AbstractBrokerChildRecoverer<ConfiguredObject>
{
    private QpidServiceLoader<PluginFactory> _serviceLoader;

    public PluginRecoverer(QpidServiceLoader<PluginFactory> serviceLoader)
    {
        _serviceLoader = serviceLoader;
    }

    @Override
    ConfiguredObject createBrokerChild(RecovererProvider recovererProvider, ConfigurationEntry configurationEntry, Broker broker)
    {
        Map<String, Object> attributes = configurationEntry.getAttributes();
        Iterable<PluginFactory> factories = _serviceLoader.instancesOf(PluginFactory.class);
        for (PluginFactory pluginFactory : factories)
        {
            UUID configurationId = configurationEntry.getId();
            ConfiguredObject pluginObject = pluginFactory.createInstance(configurationId, attributes, broker);
            if (pluginObject != null)
            {
                UUID pluginId = pluginObject.getId();
                if (!configurationId.equals(pluginId))
                {
                    throw new IllegalStateException("Plugin object id '" + pluginId + "' does not equal expected id " + configurationId);
                }
                return pluginObject;
            }
        }
        throw new IllegalConfigurationException("Cannot create a plugin object for " + attributes + " with factories " + factories);
    }
}