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Java Source Code / Java Documentation » RSS RDF » Jena 2.5.5 » com.hp.hpl.jena.reasoner.rulesys.impl   Source Cross Reference   Class Diagram   Java Document (Java Doc)   java.lang.Object    com.hp.hpl.jena.reasoner.rulesys.impl.Generator Generator public class Generator implements LPAgendaEntry,LPInterpreterContext(Code) A generator represents a set of memoized results for a single tabled subgoal. The generator may be complete (in which case it just contains the complete cached set of results for a goal), ready (not complete but likely to product more results if called) or blocked (not complete and awaiting results from a dependent generator). Each generator may have multiple associated consumer choice points representing different choices in satisfying the generator's goal. author:    Dave Reynolds version:    $Revision: 1.10 $ on $Date: 2008/01/02 12:06:16 $ Field Summary protected  boolean checkReadyNeeded      protected  LFlag completionState      protected  Set consumingCPs      protected  Set generatingCPs      protected  TriplePattern goal      protected  LPInterpreter interpreter      protected  boolean isReady      protected  boolean isSingleton      protected  Set resultSet      protected  ArrayList results      Constructor Summary public   Generator(LPInterpreter interpreter, TriplePattern goal)      Constructor. Method Summary public  void addConsumer(ConsumerChoicePointFrame ccp)      Add a new client choince point to consume results from this generator. public  void checkForCompletions()      Check for deadlocked states where none of the generators we are (indirectly) dependent on can run. public static  void checkForCompletions(Collection completions)      Check for deadlocked states across a collection of generators which have been run. public  Generator getGenerator()      public  boolean isComplete()      Return true if the generator is complete. public  boolean isReady()      Return true if the generator is ready to be scheduled (i.e. public  void notifyBlockedOn(ConsumerChoicePointFrame ccp)      Notify that the interpreter has now blocked on the given choice point. public  void notifyFinished(ConsumerChoicePointFrame ccp)      Notify this context that the given choice point has terminated and can be remove from the wait list. public  void notifyResults()      Signal dependents that we have new results. public  int numResults()      Return the number of results available from this context. protected static  void postCompletionCheckScan(Set visited)      Scan the result of a (set of) completion check(s) to detect which of the unknowns are actually live and set the remaining (deadlocked) states to complete. protected  void propagateLive(Set filter)      Propagate liveness state forward to consuming generators, but only those within the filter set. public  void pump()      Start this generator running for the first time. public  void pump(LPInterpreterState context)      Start this generator running from the given previous blocked generating choice point. public  void removeConsumer(ConsumerChoicePointFrame ccp)      Remove a terminated consuming choice point from the state set. protected  LFlag runCompletionCheck(Set visited)      Check whether this generator is live (indirectly dependent on a ready generator), dead (complete) or in a deadlock loop which might or might not be live (unknown). public  void setComplete()      Signal that this generator is complete, no more results can be created. public  void setReady(ConsumerChoicePointFrame ccp)      Directly set that this generator is ready (because the generator for one of its generatingCPs has produced new results). Field Detail checkReadyNeeded protected boolean checkReadyNeeded(Code) set to true if at least one branch has block so an active readiness check is required completionState protected LFlag completionState(Code) Flags whether the generator is live/dead/unknown during completion checking consumingCPs protected Set consumingCPs(Code) The list of active consumer choice points consuming results from this generator generatingCPs protected Set generatingCPs(Code) The set of choice points producing results for us to use goal protected TriplePattern goal(Code) The goal the generator is satisfying - just used in debugging interpreter protected LPInterpreter interpreter(Code) The intepreter instance which generates the results for this goal, null if the generator is complete isReady protected boolean isReady(Code) set to true if the dependent generator has new results ready for us isSingleton protected boolean isSingleton(Code) True if this generator can produce at most one answer resultSet protected Set resultSet(Code) A indexed version of the result set, used while the generator is live to detect duplicate results results protected ArrayList results(Code) The ordered set of results available for the goal Constructor Detail Generator public Generator(LPInterpreter interpreter, TriplePattern goal)(Code) Constructor. Parameters:   interpreter - an initialized interpreter instance that will answer results for this generator. Method Detail addConsumer public void addConsumer(ConsumerChoicePointFrame ccp)(Code) Add a new client choince point to consume results from this generator. checkForCompletions public void checkForCompletions()(Code) Check for deadlocked states where none of the generators we are (indirectly) dependent on can run. checkForCompletions public static void checkForCompletions(Collection completions)(Code) Check for deadlocked states across a collection of generators which have been run. getGenerator public Generator getGenerator()(Code) Return the generator associated with this entry (might be the entry itself) isComplete public boolean isComplete()(Code) Return true if the generator is complete. isReady public boolean isReady()(Code) Return true if the generator is ready to be scheduled (i.e. it is not known to be complete and not known to be waiting for a dependent generator). notifyBlockedOn public void notifyBlockedOn(ConsumerChoicePointFrame ccp)(Code) Notify that the interpreter has now blocked on the given choice point. notifyFinished public void notifyFinished(ConsumerChoicePointFrame ccp)(Code) Notify this context that the given choice point has terminated and can be remove from the wait list. notifyResults public void notifyResults()(Code) Signal dependents that we have new results. numResults public int numResults()(Code) Return the number of results available from this context. postCompletionCheckScan protected static void postCompletionCheckScan(Set visited)(Code) Scan the result of a (set of) completion check(s) to detect which of the unknowns are actually live and set the remaining (deadlocked) states to complete. propagateLive protected void propagateLive(Set filter)(Code) Propagate liveness state forward to consuming generators, but only those within the filter set. pump public void pump()(Code) Start this generator running for the first time. Should be called from within an appropriately synchronized block. pump public void pump(LPInterpreterState context)(Code) Start this generator running from the given previous blocked generating choice point. Should be called from within an appropriately synchronized block. removeConsumer public void removeConsumer(ConsumerChoicePointFrame ccp)(Code) Remove a terminated consuming choice point from the state set. runCompletionCheck protected LFlag runCompletionCheck(Set visited)(Code) Check whether this generator is live (indirectly dependent on a ready generator), dead (complete) or in a deadlock loop which might or might not be live (unknown). setComplete public void setComplete()(Code) Signal that this generator is complete, no more results can be created. setReady public void setReady(ConsumerChoicePointFrame ccp)(Code) Directly set that this generator is ready (because the generator for one of its generatingCPs has produced new results). Methods inherited from java.lang.Object native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc) public boolean equals(Object obj)(Code)(Java Doc) protected void finalize() throws Throwable(Code)(Java Doc) final native public Class getClass()(Code)(Java Doc) native public int hashCode()(Code)(Java Doc) final native public void notify()(Code)(Java Doc) final native public void notifyAll()(Code)(Java Doc) public String toString()(Code)(Java Doc) final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc) final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc) final public void wait() throws InterruptedException(Code)(Java Doc)