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Java Source Code / Java Documentation » RSS RDF » Jena 2.5.5 » com.hp.hpl.jena.reasoner.rulesys.impl.oldCode

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Class Diagram

Java Document (Java Doc)

java.lang .Object

com.hp.hpl.jena.reasoner.rulesys.impl.oldCode .BRuleEngine

BRuleEngine
public class BRuleEngine (Code)
	Part of the backward chaining rule interpreter. Maintains an agenda containing an ordered list of RuleStates awaiting processing (each RuleState represents the tip of a partially expanded search tree). This object does the top level scheduling of rule processing. By default it batches up several results from the top rule in the agenda before switching to expand other trees. The size of this batch is adjustable. author: Dave Reynolds version: $Revision: 1.8 $ on $Date: 2008/01/02 12:09:45 $

Field Summary
protected LinkedList	agenda
protected int	batchSize
protected GoalTable	goalTable
protected BackwardRuleInfGraphI	infGraph
static Log	logger
protected long	nRulesFired
protected boolean	recordDerivations
protected RuleStore	ruleStore
protected boolean	traceOn

Constructor Summary
public	BRuleEngine(BackwardRuleInfGraphI infGraph, RuleStore rules) Constructor.
public	BRuleEngine(BackwardRuleInfGraphI infGraph) Constructor.

Method Summary
public void	addRule(Rule rule) Add a single rule to the store. N.B.
public synchronized void	appendToAgenda(RuleState rs) Append a new rule node to the end of the agenda.
public void	deleteAllRules() Delete all the rules.
public void	deleteRule(Rule rule) Remove a single rule from the store. N.B.
public void	dump() Dump an a summary of the goal table state to stdout.
public synchronized GoalState	findGoal(TriplePattern goal) Find the set of memoized solutions for the given goal and return a GoalState that can traverse all the solutions.
public List	getAllRules() Return an ordered list of all registered rules.
public BackwardRuleInfGraphI	getInfGraph() Return the rule infernce graph that owns this engine.
public long	getNRulesFired()
public synchronized void	halt() Stop the current work.
public boolean	isTraceOn() Return true if traces of rule firings should be logged.
public synchronized Triple	next(GoalState topGoalState) The main processing loop.
public RuleState	nextAgendaItem() Get next agenda item.
public synchronized void	prependToAgenda(RuleState rs) Prepend a new rule node to the head of the agenda.
public boolean	processBuiltin(ClauseEntry clause, Rule rule, BindingEnvironment env)
public synchronized void	reset() Clear all tabled results.
public List	rulesFor(TriplePattern goal)
public void	setDerivationLogging(boolean recordDerivations)
public void	setTraceOn(boolean state) Set the state of the trace flag.

Field Detail

agenda
protected LinkedList agenda(Code)
	a list of active RuleStates to be processed

batchSize
protected int batchSize(Code)
	The size of the result batch permitted before a rule should reschedule itself lower on the agenda

goalTable
protected GoalTable goalTable(Code)
	The table of all goals

infGraph
protected BackwardRuleInfGraphI infGraph(Code)
	The inference graph which is using this engine - used for calling builtins

logger
static Log logger(Code)

nRulesFired
protected long nRulesFired(Code)
	performance stats - number of rules fired

recordDerivations
protected boolean recordDerivations(Code)
	Set to true to flag that derivations should be logged

ruleStore
protected RuleStore ruleStore(Code)
	Indexed version of the rule set

traceOn
protected boolean traceOn(Code)
	True if debug information should be written out

Constructor Detail

BRuleEngine
public BRuleEngine(BackwardRuleInfGraphI infGraph, RuleStore rules)(Code)
	Constructor. Parameters: infGraph - the parent inference graph which is using this engine Parameters: rules - the indexed set of rules to process

BRuleEngine
public BRuleEngine(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 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.

appendToAgenda
public synchronized void appendToAgenda(RuleState rs)(Code)
	Append a new rule node to the end of the agenda.

deleteAllRules
public void deleteAllRules()(Code)
	Delete all the rules.

deleteRule
public 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.

dump
public void dump()(Code)
	Dump an a summary of the goal table state to stdout. Just debugging, do not use for real.

findGoal
public synchronized GoalState findGoal(TriplePattern goal)(Code)
	Find the set of memoized solutions for the given goal and return a GoalState that can traverse all the solutions. Parameters: goal - the goal to be solved a GoalState which can iterate over all of the goal solutions

getAllRules
public List getAllRules()(Code)
	Return an ordered list of all registered rules.

getInfGraph
public BackwardRuleInfGraphI getInfGraph()(Code)
	Return the rule infernce graph that owns this engine.

getNRulesFired
public long getNRulesFired()(Code)
	Return the number of rules fired since this rule engine instance was created and initialized

halt
public synchronized void halt()(Code)
	Stop the current work. This is called if the top level results iterator has either finished or the calling application has had enough. We leave any completed results in the GoalTable but clear out the agenda and all non-compelted results.

isTraceOn
public boolean isTraceOn()(Code)
	Return true if traces of rule firings should be logged.

next
public synchronized Triple next(GoalState topGoalState)(Code)
	The main processing loop. Continues processing agenda items until either a new solution to the top goal has been found or the agenda is empty and so no more solutions are available. Parameters: topGoalState - the top level GoalState whose values are being sought null if all processing is complete and no more solutions areavailable, otherwise returns the next result available for the topGoal.

nextAgendaItem
public RuleState nextAgendaItem()(Code)
	Get next agenda item. May do heuristic selection of next item to process.

prependToAgenda
public synchronized void prependToAgenda(RuleState rs)(Code)
	Prepend a new rule node to the head of the agenda.

processBuiltin
public boolean processBuiltin(ClauseEntry clause, Rule rule, BindingEnvironment env)(Code)
	Process a call to a builtin predicate Parameters: clause - the Functor representing the call Parameters: env - the BindingEnvironment for this call Parameters: rule - the rule which is invoking this call true if the predicate succeeds

reset
public synchronized void reset()(Code)
	Clear all tabled results.

rulesFor
public List rulesFor(TriplePattern goal)(Code)
	Return a list of rules that match the given goal entry

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.

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)

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