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/**
* @file llcapabilitylistener.h
* @author Nat Goodspeed
* @date 2009-01-07
* @brief Provide an event-based API for capability requests
*
* $LicenseInfo:firstyear=2009&license=viewergpl$
* Copyright (c) 2009, Linden Research, Inc.
* $/LicenseInfo$
*/
#if ! defined(LL_LLCAPABILITYLISTENER_H)
#define LL_LLCAPABILITYLISTENER_H
#include "llevents.h" // LLEventPump
#include "llsdmessage.h" // LLSDMessage::ArgError
#include "llerror.h" // LOG_CLASS()
class LLCapabilityProvider;
class LLMessageSystem;
class LLSD;
class LLCapabilityListener
{
LOG_CLASS(LLCapabilityListener);
public:
LLCapabilityListener(const std::string& name, LLMessageSystem* messageSystem,
const LLCapabilityProvider& provider,
const LLUUID& agentID, const LLUUID& sessionID);
/// Capability-request exception
typedef LLSDMessage::ArgError ArgError;
/// Get LLEventPump on which we listen for capability requests
/// (https://wiki.lindenlab.com/wiki/Viewer:Messaging/Messaging_Notes#Capabilities)
LLEventPump& getCapAPI() { return mEventPump; }
/**
* Base class for mapping an as-yet-undeployed capability name to a (pair
* of) LLMessageSystem message(s). To map a capability name to such
* messages, derive a subclass of CapabilityMapper and declare a static
* instance in a translation unit known to be loaded. The mapping is not
* region-specific. If an LLViewerRegion's capListener() receives a
* request for a supported capability, it will use the capability's URL.
* If not, it will look for an applicable CapabilityMapper subclass
* instance.
*/
class CapabilityMapper
{
public:
/**
* Base-class constructor. Typically your subclass constructor will
* pass these parameters as literals.
* @param cap the capability name handled by this (subclass) instance
* @param reply the name of the response LLMessageSystem message. Omit
* if the LLMessageSystem message you intend to send doesn't prompt a
* reply message, or if you already handle that message in some other
* way.
*/
CapabilityMapper(const std::string& cap, const std::string& reply = "");
virtual ~CapabilityMapper();
/// query the capability name
std::string getCapName() const { return mCapName; }
/// query the reply message name
std::string getReplyName() const { return mReplyName; }
/**
* Override this method to build the LLMessageSystem message we should
* send instead of the requested capability message. DO NOT send that
* message: that will be handled by the caller.
*/
virtual void buildMessage(LLMessageSystem* messageSystem,
const LLUUID& agentID,
const LLUUID& sessionID,
const std::string& capabilityName,
const LLSD& payload) const = 0;
/**
* Override this method if you pass a non-empty @a reply
* LLMessageSystem message name to the constructor: that is, if you
* expect to receive an LLMessageSystem message in response to the
* message you constructed in buildMessage(). If you don't pass a @a
* reply message name, you need not override this method as it won't
* be called.
*
* Using LLMessageSystem message-reading operations, your
* readResponse() override should construct and return an LLSD object
* of the form you expect to receive from the real implementation of
* the capability you intend to invoke, when it finally goes live.
*/
virtual LLSD readResponse(LLMessageSystem* messageSystem) const;
private:
const std::string mCapName;
const std::string mReplyName;
};
private:
/// Bind the LLCapabilityProvider passed to our ctor
const LLCapabilityProvider& mProvider;
/// Post an event to this LLEventPump to invoke a capability message on
/// the bound LLCapabilityProvider's server
/// (https://wiki.lindenlab.com/wiki/Viewer:Messaging/Messaging_Notes#Capabilities)
LLEventStream mEventPump;
LLMessageSystem* mMessageSystem;
LLUUID mAgentID, mSessionID;
/// listener to process capability requests
bool capListener(const LLSD&);
/// helper class for capListener()
class CapabilityMappers;
};
#endif /* ! defined(LL_LLCAPABILITYLISTENER_H) */
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