Package org.eclipse.core.runtime.jobs

Class MultiRule

  • All Implemented Interfaces:
    ISchedulingRule
    public class MultiRule
extends Object
implements ISchedulingRule
    A MultiRule is a compound scheduling rule that represents a fixed group of child scheduling rules. A MultiRule conflicts with another rule if any of its children conflict with that rule. More formally, a compound rule represents a logical intersection of its child rules with respect to the isConflicting equivalence relation.

    A MultiRule will never contain other MultiRules as children. If a MultiRule is provided as a child, its children will be added instead.

    Since:
    3.0
    Restriction:
    This class is not intended to be subclassed by clients.

    • Constructor Detail

      • MultiRule

        public MultiRule​(ISchedulingRule[] nestedRules)
        Creates a new scheduling rule that composes a set of nested rules.
        Parameters:
        nestedRules - the nested rules for this compound rule.

    • Method Detail

      • combine

        public static ISchedulingRule combine​(ISchedulingRule[] ruleArray)
        Returns a scheduling rule that encompasses all provided rules. The resulting rule may or may not be an instance of MultiRule. If all provided rules are null then the result will be null.
        Parameters:
        ruleArray - An array of scheduling rules, some of which may be null
        Returns:
        a combined scheduling rule, or null
        Since:
        3.1

      • combine

        public static ISchedulingRule combine​(ISchedulingRule rule1,
                                      ISchedulingRule rule2)
        Returns a scheduling rule that encompasses both provided rules. The resulting rule may or may not be an instance of MultiRule. If both provided rules are null then the result will be null.
        Parameters:
        rule1 - a scheduling rule, or null
        rule2 - another scheduling rule, or null
        Returns:
        a combined scheduling rule, or null

      • getChildren

        public ISchedulingRule[] getChildren()
        Returns the child rules within this rule.
        Returns:
        the child rules

      • contains

        public boolean contains​(ISchedulingRule rule)
        Description copied from interface: ISchedulingRule
        Returns whether this scheduling rule completely contains another scheduling rule. Rules can only be nested within a thread if the inner rule is completely contained within the outer rule.

        Implementations of this method must obey the rules of a partial order relation on the set of all scheduling rules. In particular, implementations must be reflexive (a.contains(a) is always true), antisymmetric (a.contains(b) and b.contains(a) iff a.equals(b), and transitive (if a.contains(b) and b.contains(c), then a.contains(c)). Implementations of this method must return false when compared to a rule they know nothing about.

        Specified by:
        contains in interface ISchedulingRule
        Parameters:
        rule - the rule to check for containment
        Returns:
        true if this rule contains the given rule, and false otherwise.

      • isConflicting

        public boolean isConflicting​(ISchedulingRule rule)
        Description copied from interface: ISchedulingRule
        Returns whether this scheduling rule is compatible with another scheduling rule. If true is returned, then no job with this rule will be run at the same time as a job with the conflicting rule. If false is returned, then the job manager is free to run jobs with these rules at the same time.

        Implementations of this method must be reflexive, symmetric, and consistent, and must return false when compared to a rule they know nothing about.

        This method must return true if calling ISchedulingRule.contains(ISchedulingRule) on the same rule also returns true. This is required because it would otherwise allow two threads to be running concurrently with the same rule.

        Specified by:
        isConflicting in interface ISchedulingRule
        Parameters:
        rule - the rule to check for conflicts
        Returns:
        true if the rule is conflicting, and false otherwise.