92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
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/*
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different types of streamvalves used by operator streamvalve
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*/
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#ifndef ALGEBRAS_TEMPORAL2_STREAMVALVE_H_
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#define ALGEBRAS_TEMPORAL2_STREAMVALVE_H_
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#include <string>
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#include <tr1/memory>
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#include <boost/interprocess/sync/scoped_lock.hpp>
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#include <boost/interprocess/sync/named_mutex.hpp>
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#include <boost/interprocess/sync/interprocess_mutex.hpp>
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#include <boost/interprocess/sync/interprocess_condition.hpp>
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#include <boost/interprocess/shared_memory_object.hpp>
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#include <boost/interprocess/mapped_region.hpp>
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#include <boost/interprocess/sync/scoped_lock.hpp>
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namespace temporal2algebra {
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const static std::string OpenValveId ="Open";
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const static std::string RandomValveId ="Random";
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const static std::string RemoteValveId ="Remote";
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class StreamValve;
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typedef std::tr1::shared_ptr<StreamValve> StreamValvePtr;
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class StreamValve {
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public:
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virtual void waitForSignal();
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virtual void sendHasReadSucceeded(bool successful);
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virtual ~StreamValve();
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protected:
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StreamValve();
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};
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class OpenStreamValve : public StreamValve {
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};
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class RandomStreamValve : public StreamValve{
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public:
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RandomStreamValve(int min_wait_sec, int max_wait_sec);
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virtual ~RandomStreamValve();
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virtual void waitForSignal();
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private:
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int min_wait_sec;
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int max_wait_sec;
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};
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struct RemoteValveControl{
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RemoteValveControl() :
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num_request(0),
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request_processed(false),
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num_done(0) {};
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// how many items should the valve let pass
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int num_request;
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// indicates that a request has been processed (as num_done may be 0)
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bool request_processed;
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// how many items were actually let through?
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//any value less than the requested number indicates end of stream
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int num_done;
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boost::interprocess::interprocess_mutex mutex;
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// the valve will wait on this condition to start processing
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boost::interprocess::interprocess_condition cond_wait_for_signal;
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// the next op will wait here after a request has been made
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boost::interprocess::interprocess_condition cond_wait_for_read_result;
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};
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class RemoteStreamValve : public StreamValve{
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public:
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static RemoteStreamValve* create(std::string controllerId);
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virtual ~RemoteStreamValve();
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static int advance(const std::string& controllerId, int advanceCount);
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virtual void waitForSignal();
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virtual void sendHasReadSucceeded(bool successful);
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private:
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RemoteStreamValve(std::string controllerId);
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std::string controllerId;
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boost::interprocess::named_mutex mutex;
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boost::interprocess::shared_memory_object shm;
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boost::interprocess::mapped_region region;
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RemoteValveControl* controlPtr;
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};
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} /* namespace temporal2algebra */
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#endif /* ALGEBRAS_TEMPORAL2_STREAMVALVE_H_ */
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