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#ifndef QPID_PLUGIN_H
#define QPID_PLUGIN_H
/*
* 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.
*
*/
#include "qpid/shared_ptr.h"
#include <boost/noncopyable.hpp>
#include <vector>
#include <boost/function.hpp>
/**@file Generic plug-in framework. */
namespace qpid {
class Options;
/**
* Plug-in base class.
*/
class Plugin : boost::noncopyable
{
public:
/**
* Base interface for targets that receive plug-ins.
*
* The Broker is a plug-in target, there might be others
* in future.
*/
struct Target { virtual ~Target() {} };
typedef std::vector<Plugin*> Plugins;
/**
* Construct registers the plug-in to appear in getPlugins().
*
* A concrete Plugin is instantiated as a global or static
* member variable in a library so it is registered during static
* initialization when the library is loaded.
*/
Plugin();
virtual ~Plugin();
/**
* Configuration options for the plugin.
* Then will be updated during option parsing by the host program.
*
* @return An options group or 0 for no options. Default returns 0.
* Plugin retains ownership of return value.
*/
virtual Options* getOptions();
/**
* Initialize Plugin functionality on a Target.
* Plugins should ignore targets they don't recognize.
*
* Called before the target itself is initialized.
*/
virtual void earlyInitialize(Target&) = 0;
/**
* Initialize Plugin functionality on a Target.
* Plugins should ignore targets they don't recognize.
*
* Called after the target is fully initialized.
*/
virtual void initialize(Target&) = 0;
/** List of registered Plugin objects.
* Caller must not delete plugin pointers.
*/
static const Plugins& getPlugins();
private:
static Plugins plugins;
};
} // namespace qpid
#endif /*!QPID_PLUGIN_H*/
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