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/**
* @file llplugininstance.h
*
* @cond
* $LicenseInfo:firstyear=2008&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
* @endcond
*/
#ifndef LL_LLPLUGININSTANCE_H
#define LL_LLPLUGININSTANCE_H
#include "llstring.h"
#include "llapr.h"
#include "apr_dso.h"
/**
* @brief LLPluginInstanceMessageListener receives messages sent from the plugin loader shell to the plugin.
*/
class LLPluginInstanceMessageListener
{
public:
virtual ~LLPluginInstanceMessageListener();
/** Plugin receives message from plugin loader shell. */
virtual void receivePluginMessage(const std::string &message) = 0;
};
/**
* @brief LLPluginInstance handles loading the dynamic library of a plugin and setting up its entry points for message passing.
*/
class LLPluginInstance
{
LOG_CLASS(LLPluginInstance);
public:
LLPluginInstance(LLPluginInstanceMessageListener *owner);
virtual ~LLPluginInstance();
// Load a plugin dll/dylib/so
// Returns 0 if successful, APR error code or error code returned from the plugin's init function on failure.
int load(std::string &plugin_file);
// Sends a message to the plugin.
void sendMessage(const std::string &message);
// TODO:DOC is this comment obsolete? can't find "send_count" anywhere in indra tree.
// send_count is the maximum number of message to process from the send queue. If negative, it will drain the queue completely.
// The receive queue is always drained completely.
// Returns the total number of messages processed from both queues.
void idle(void);
/** The signature of the function for sending a message from plugin to plugin loader shell.
*
* @param[in] message_string Null-terminated C string
* @param[in] user_data The opaque reference that the callee supplied during setup.
*/
typedef void (*sendMessageFunction) (const char *message_string, void **user_data);
/** The signature of the plugin init function. TODO:DOC check direction (pluging loader shell to plugin?)
*
* @param[in] host_user_data Data from plugin loader shell.
* @param[in] plugin_send_function Function for sending from the plugin loader shell to plugin.
*/
typedef int (*pluginInitFunction) (sendMessageFunction host_send_func, void *host_user_data, sendMessageFunction *plugin_send_func, void **plugin_user_data);
/** Name of plugin init function */
static const char *PLUGIN_INIT_FUNCTION_NAME;
private:
static void staticReceiveMessage(const char *message_string, void **user_data);
void receiveMessage(const char *message_string);
apr_dso_handle_t *mDSOHandle;
void *mPluginUserData;
sendMessageFunction mPluginSendMessageFunction;
LLPluginInstanceMessageListener *mOwner;
};
#endif // LL_LLPLUGININSTANCE_H
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