Package com.alachisoft.ncache.client

Class ContinuousQuery

  • public class ContinuousQuery
extends java.lang.Object
    Class to hold Object query and values, intended for notifications.

    • Constructor Detail

      • ContinuousQuery

        public ContinuousQuery​(QueryCommand command)
        Initializes a new instance of the ContinuousQuery class.
        Parameters:
        command - QueryCommand containing query text and values.

    • Method Detail

      • getQueryCommand

        public QueryCommand getQueryCommand()
        Gets the query command for the continuous query.
        Returns:
        The QueryCommand instance.

      • setQueryCommand

        public void setQueryCommand​(QueryCommand value)
        Sets the query command for the continuous query.
        Parameters:
        value - The QueryCommand instance.

      • addDataModificationListener

        public void addDataModificationListener​(QueryDataModificationListener listener,
                                        java.util.EnumSet<EventType> eventEnumSet,
                                        EventDataFilter datafilter)
                                 throws java.lang.IllegalArgumentException
        This method registers a custom listener that is fired on change in dataset of a continuous query
        Parameters:
        listener - The listener that is invoked whenever there is a change in dataset of continuous Query.
        eventEnumSet - Registers the listener with the specified event types in the enumset.
        datafilter - This enum is to describe when registering an event, upon raise how much data is retrieved from cache when the event is raised.
        Throws:
        java.lang.IllegalArgumentException

      • removeDataModificationListener

        public void removeDataModificationListener​(QueryDataModificationListener listener,
                                           java.util.EnumSet<EventType> eventEnumSet)
                                    throws java.lang.IllegalArgumentException
        This method unregisters a custom listener that is fired on change in dataset of a continuous query.
        Parameters:
        listener - The listener that was registered with continuous query.
        eventEnumSet - Unregisters the listener with the specified event types in the enumset.
        Throws:
        java.lang.IllegalArgumentException

      • equals

        public boolean equals​(java.lang.Object obj)
        Indicates whether some other object is "equal to" this one.

        The equals method implements an equivalence relation on non-null object references:

        • It is reflexive: for any non-null reference value x, x.equals(x) should return true.
        • It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
        • It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
        • It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
        • For any non-null reference value x, x.equals(null) should return false.

        The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values x and y, this method returns true if and only if x and y refer to the same object (x == y has the value true).

        Note that it is generally necessary to override the hashCode method whenever this method is overridden, so as to maintain the general contract for the hashCode method, which states that equal objects must have equal hash codes.

        Overrides:
        equals in class java.lang.Object
        Parameters:
        obj - the reference object with which to compare.
        Returns:
        true if this object is the same as the obj argument; false otherwise.
        See Also:
        hashCode(), HashMap

      • hashCode

        public int hashCode()
        Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by HashMap.

        The general contract of hashCode is:

        • Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
        • If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.
        • It is not required that if two objects are unequal according to the Object.equals(java.lang.Object) method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

        As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (The hashCode may or may not be implemented as some function of an object's memory address at some point in time.)

        Overrides:
        hashCode in class java.lang.Object
        Returns:
        a hash code value for this object.
        See Also:
        Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)