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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.LPBRuleEngine LPBRuleEngine public class LPBRuleEngine (Code) LP version of the core backward chaining engine. For each parent inference graph (whether pure backward or hybrid) there should be one LPBRuleEngine instance. The shared instance holds any common result caching, rule store and global state data. However, all the processing is done by instances of the LPInterpreter - one per query. author:    Dave Reynolds version:    $Revision: 1.13 $ on $Date: 2008/01/02 12:06:16 $ Inner Class :static class Count implements Comparable Field Summary final public static  int CYCLES_BETWEEN_COMPLETION_CHECK      The number of generator cycles to wait before running a completion check. If set to 0 then checks will be done in the generator each time. protected  List activeInterpreters      protected  LinkedList agenda      protected  BackwardRuleInfGraphI infGraph      static  Log logger      protected  HashMap profile      protected  boolean recordDerivations      protected  LPRuleStore ruleStore      protected  HashMap tabledGoals      Table mapping tabled goals to generators for those goals. This is here so that partial goal state can be shared across multiple queries. protected  boolean traceOn      Constructor Summary public   LPBRuleEngine(BackwardRuleInfGraphI infGraph, LPRuleStore rules)      Constructor. public   LPBRuleEngine(BackwardRuleInfGraphI infGraph)      Constructor. Method Summary public synchronized  void addRule(Rule rule)      Add a single rule to the store. N.B. public  void checkForCompletions()      Check all known interpeter contexts to see if any are complete. public  void checkSafeToUpdate()      Check that there are no currently processing queries. Could throw an exception here but often this can be caused by simply leaving an unclosed iterator. public synchronized  void deleteAllRules()      Delete all the rules. public synchronized  void deleteRule(Rule rule)      Remove a single rule from the store. N.B. public synchronized  void detach(LPInterpreter engine)      public synchronized  ExtendedIterator find(TriplePattern goal)      Start a new interpreter running to answer a query. public synchronized  Generator generatorFor(TriplePattern goal, List clauses)      Return a generator for the given goal (assumes that the caller knows that the goal should be tabled). public synchronized  Generator generatorFor(TriplePattern goal)      Return a generator for the given goal (assumes that the caller knows that the goal should be tabled). public synchronized  List getAllRules()      Return an ordered list of all registered rules. public  boolean getDerivationLogging()      Return true in derivations should be logged. public  BackwardRuleInfGraphI getInfGraph()      public  LPRuleStore getRuleStore()      public synchronized  void halt()      Stop the current work. public  void incrementProfile(RuleClauseCode clause)      Record a rule invocation in the profile count. public  boolean isTraceOn()      Return true if traces of rule firings should be logged. public  void printProfile()      Print a profile of rules used since the last reset. public synchronized  void pump(LPInterpreterContext gen)      Run the scheduled generators until the given generator is ready to run. public synchronized  void reset()      Clear all tabled results. public  void resetProfile(boolean enable)      Reset the profile. public  void schedule(LPAgendaEntry state)      Register that a generator or specific generator state (Consumer choice point) is now ready to run. public  void setDerivationLogging(boolean recordDerivations)      public  void setTraceOn(boolean state)      Set the state of the trace flag. public synchronized  void tablePredicate(Node predicate)      Register an RDF predicate as one whose presence in a goal should force the goal to be tabled. Field Detail CYCLES_BETWEEN_COMPLETION_CHECK final public static int CYCLES_BETWEEN_COMPLETION_CHECK(Code) The number of generator cycles to wait before running a completion check. If set to 0 then checks will be done in the generator each time. activeInterpreters protected List activeInterpreters(Code) List of engine instances which are still processing queries agenda protected LinkedList agenda(Code) Set of generators waiting to be run infGraph protected BackwardRuleInfGraphI infGraph(Code) The parent inference graph to which this engine is attached logger static Log logger(Code) profile protected HashMap profile(Code) Optional profile of number of time each rule is entered, set to non-null to profile recordDerivations protected boolean recordDerivations(Code) Set to true to flag that derivations should be logged ruleStore protected LPRuleStore ruleStore(Code) Store which holds the raw and compiled rules tabledGoals protected HashMap tabledGoals(Code) Table mapping tabled goals to generators for those goals. This is here so that partial goal state can be shared across multiple queries. traceOn protected boolean traceOn(Code) True if debug information should be written out Constructor Detail LPBRuleEngine public LPBRuleEngine(BackwardRuleInfGraphI infGraph, LPRuleStore rules)(Code) Constructor. Parameters:   infGraph - the parent inference graph which is using this engine Parameters:   rules - the indexed set of rules to process LPBRuleEngine public LPBRuleEngine(BackwardRuleInfGraphI infGraph)(Code) Constructor. Creates an empty engine to which rules must be added. Parameters:   infGraph - the parent inference graph which is using this engine Method Detail addRule public synchronized void addRule(Rule rule)(Code) Add a single rule to the store. N.B. This will invalidate current partial results and the engine should be reset() before future queries. checkForCompletions public void checkForCompletions()(Code) Check all known interpeter contexts to see if any are complete. checkSafeToUpdate public void checkSafeToUpdate()(Code) Check that there are no currently processing queries. Could throw an exception here but often this can be caused by simply leaving an unclosed iterator. So instead we try to close the iterators and assume the rest of the context will be reset by the add call. Should be called from within a synchronized block. deleteAllRules public synchronized void deleteAllRules()(Code) Delete all the rules. deleteRule public synchronized void deleteRule(Rule rule)(Code) Remove a single rule from the store. N.B. This will invalidate current partial results and the engine should be reset() before future queries. detach public synchronized void detach(LPInterpreter engine)(Code) Detatch the given engine from the list of active engines for this inf graph find public synchronized ExtendedIterator find(TriplePattern goal)(Code) Start a new interpreter running to answer a query. Parameters:   goal - the query to be processed a closable iterator over the query results generatorFor public synchronized Generator generatorFor(TriplePattern goal, List clauses)(Code) Return a generator for the given goal (assumes that the caller knows that the goal should be tabled). Parameters:   goal - the goal whose results are to be generated Parameters:   clauses - the precomputed set of code blocks used to implement the goal generatorFor public synchronized Generator generatorFor(TriplePattern goal)(Code) Return a generator for the given goal (assumes that the caller knows that the goal should be tabled). Parameters:   goal - the goal whose results are to be generated getAllRules public synchronized List getAllRules()(Code) Return an ordered list of all registered rules. getDerivationLogging public boolean getDerivationLogging()(Code) Return true in derivations should be logged. getInfGraph public BackwardRuleInfGraphI getInfGraph()(Code) Return the parent infernce graph associated with this engine getRuleStore public LPRuleStore getRuleStore()(Code) Return the rule store associated with the inference graph halt public synchronized void halt()(Code) Stop the current work. Forcibly stop all current query instances over this engine. incrementProfile public void incrementProfile(RuleClauseCode clause)(Code) Record a rule invocation in the profile count. isTraceOn public boolean isTraceOn()(Code) Return true if traces of rule firings should be logged. printProfile public void printProfile()(Code) Print a profile of rules used since the last reset. pump public synchronized void pump(LPInterpreterContext gen)(Code) Run the scheduled generators until the given generator is ready to run. reset public synchronized void reset()(Code) Clear all tabled results. resetProfile public void resetProfile(boolean enable)(Code) Reset the profile. Parameters:   enable - it true then profiling will continue with a new empty profile table,if false profiling will stop all current data lost. schedule public void schedule(LPAgendaEntry state)(Code) Register that a generator or specific generator state (Consumer choice point) is now ready to run. setDerivationLogging public void setDerivationLogging(boolean recordDerivations)(Code) Set to true to enable derivation caching setTraceOn public void setTraceOn(boolean state)(Code) Set the state of the trace flag. If set to true then rule firings are logged out to the Log at "INFO" level. tablePredicate public synchronized void tablePredicate(Node predicate)(Code) Register an RDF predicate as one whose presence in a goal should force the goal to be tabled. 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)