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318 lines
8.5 KiB
318 lines
8.5 KiB
/* -*- C++ -*-
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* Copyright (C) 2003,2004 Thiago Macieira <thiago.macieira@kdemail.net>
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*
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef KRESOLVERWORKERBASE_H
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#define KRESOLVERWORKERBASE_H
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#include "kresolver.h"
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// forward declarations
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class QString;
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template <class T> class QValueList;
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namespace KNetwork {
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namespace Internal
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{
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class KResolverThread;
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struct InputData;
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}
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/** @internal
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* This class is the base functionality for a resolver worker. That is,
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* the class that does the actual work.
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*
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* In the future, this class might be exposed to allow plug-ins. So, try and
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* make it binary compatible.
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*
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* Note that hostnames are still encoded in Unicode at this point. It's up to
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* the worker class to decide which encoding to use. In the case of DNS,
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* an ASCII Compatible Encoding (ACE) must be used.
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* See @ref KResolver::domainToAscii.
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*
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* Also specially note that the run method in this class is called in a
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* thread that is not the program's main thread. So do not do anything there
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* that you shouldn't!
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*
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* @class KResolverWorkerBase kresolverworkerbase.h kresolverworkerbase.h
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*/
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class KResolverWorkerBase
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{
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public:
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/**
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* Helper class for locking the resolver subsystem.
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* Similar to QMutexLocker.
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*
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* @author Luís Pedro Coelho
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* @since 3.4
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*/
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class ResolverLocker
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{
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public:
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/**
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* Constructor. Acquires a lock.
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*/
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ResolverLocker(KResolverWorkerBase* parent)
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: parent( parent )
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{
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parent->acquireResolver();
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}
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/**
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* Destructor. Releases the lock.
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*/
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~ResolverLocker()
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{
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parent->releaseResolver();
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}
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/**
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* Releases the lock and then reacquires it.
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* It may be necessary to call this if the resolving function
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* decides to retry.
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*/
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void openClose()
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{
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parent->releaseResolver();
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parent->acquireResolver();
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}
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private:
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/// @internal
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KResolverWorkerBase* parent;
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};
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private:
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// this will be like our d pointer
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KNetwork::Internal::KResolverThread *th;
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const KNetwork::Internal::InputData *input;
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friend class KNetwork::Internal::KResolverThread;
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friend class KNetwork::Internal::KResolverManager;
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friend class KResolverWorkerBase::ResolverLocker;
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int m_finished : 1;
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int m_reserved : 31; // reserved
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public:
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/**
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* Derived classes will put their resolved data in this list, or will
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* leave it empty in case of error.
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*
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* Status and error codes should also be stored in this object (the
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* @ref setError function does that).
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*/
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KResolverResults results;
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public:
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// default constructor
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KResolverWorkerBase();
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// virtual destructor
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virtual ~KResolverWorkerBase();
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/**
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* This is the hostname to be looked for
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*/
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QString nodeName() const;
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/**
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* And this is the service name
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*/
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QString serviceName() const;
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/**
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* gets the flags
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*/
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int flags() const;
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/**
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* gets the family mask
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*/
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int familyMask() const;
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/**
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* gets the socket type
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*/
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int socketType() const;
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/**
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* gets the protocol number
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*/
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int protocol() const;
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/**
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* gets the protocol name, if applicable
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*/
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QCString protocolName() const;
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/**
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* Call this function to indicate that processing
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* has finished. This is useful in the preprocessing
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* stage, to indicate that @ref run doesn't have to be
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* called.
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*/
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void finished();
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protected:
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// like a QThread
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/**
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* This is the function that should be overriden in derived classes.
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*
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* Derived classes will do their blocking job in this function and return
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* either success or failure to work (not the lookup). That is, whether the
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* lookup result was a domain found or not, if we got our answer, we should
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* indicate success. The error itself must be set with @ref setError.
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*
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* \b Important: this function gets called in a separate thread!
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*
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* @return true on success
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*/
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virtual bool run() = 0;
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/**
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* This function gets called during pre processing for this class and you must
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* override it.
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*
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* \b Important: this function gets called in the main event thread. And it MUST
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* NOT block.
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*
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* This function can be used for an object to determine if it will be able
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* to resolve the given data or not even before launching into a blocking
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* operation. This function should return true if the object is capable of
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* handling this kind of data; false otherwise. Note that the return value
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* of 'true' means that the object's blocking answer will be considered authoritative.
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*
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* This function MUST NOT queue further requests. Leave that to @ref run.
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*
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* This function is pure virtual; you must override it.
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*
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* @return true on success
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*/
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virtual bool preprocess() = 0;
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/**
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* This function gets called during post processing for this class.
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*
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* \b Important: this function gets called in the main event thread. And it MUST
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* NOT block.
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*
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* @returns true on success
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*/
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virtual bool postprocess();
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/**
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* Sets the error
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*/
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inline void setError(int errorcode, int syserror = 0)
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{ results.setError(errorcode, syserror); }
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/**
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* Enqueue the given resolver for post-processing.
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*
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* Use this function to make the manager call for another resolution.
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* This is suitable for workers that do post-processing.
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*
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* The manager will make sure that any requests enqueued by this function
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* are done before calling the postprocessing function, which you should
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* override.
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*
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* \b Important: do use KResolver's own enqueueing functions (i.e., @ref KResolver::start).
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* Instead, use this function.
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*
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* @returns true on successful queueing or false if a problem ocurred
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*/
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bool enqueue(KResolver* other);
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/**
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* @overload
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*/
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bool enqueue(KResolverWorkerBase* worker);
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/**
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* Checks the resolver subsystem status.
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* @returns true if the resolver subsystem changed, false otherwise.
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* If this function returns true, it might be necessary to
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* restart the resolution altogether.
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* @since 3.4
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*/
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bool checkResolver();
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/**
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* This function has to be called from the resolver workers that require
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* use of the DNS resolver code (i.e., res_* functions, generally in
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* libresolv). It indicates that the function is starting a resolution
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* and that the resolver backend shouldn't change asynchronously.
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*
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* If any pending res_init's are required, they will be performed before
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* this function returns.
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*
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* @since 3.4
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*/
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void acquireResolver();
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/**
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* This function is the counterpart for @ref acquireResolver: the worker
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* thread indicates that it's done with the resolver.
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*
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* @since 3.4
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*/
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void releaseResolver();
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};
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/** @internal
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* This class provides functionality for creating and registering worker classes.
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*
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* @class KResolverWorkerFactoryBase kresolverworkerbase.h kresolverworkerbase.h
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*/
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class KResolverWorkerFactoryBase
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{
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public:
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virtual KResolverWorkerBase* create() const = 0;
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/**
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* Wrapper call to register workers
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*
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* It is NOT thread-safe!
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*/
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static void registerNewWorker(KResolverWorkerFactoryBase* factory);
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};
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/** @internal
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* This class provides functionality for creating and registering worker classes.
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*
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* @class KResolverWorkerFactory kresolverworkerbase.h kresolverworkerbase.h
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*/
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template<class Worker>
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class KResolverWorkerFactory: public KResolverWorkerFactoryBase
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{
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public:
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virtual KResolverWorkerBase* create() const
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{ return new Worker; }
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};
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} // namespace KNetwork
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#endif
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