net.fortytwo.stream.shj

Class QueryIndex<K,V>

java.lang.Object

net.fortytwo.stream.shj.QueryIndex<K,V>

All Implemented Interfaces:

Index<Query<K,V>>

public class QueryIndex<K,V>
extends java.lang.Object
implements Index<Query<K,V>>

An index for tuple queries and their solutions

Author:

Joshua Shinavier (http://fortytwo.net)

Constructor Summary

Constructors

Constructor and Description
QueryIndex(QueryContext<K,V> queryContext)

Method Summary

Modifier and Type	Method and Description
void	add(Query<K,V> query) Adds the given item to this index
boolean	add(V[] tuple, long expirationTime) Note: the provided tuple is modified in the process of indexing Note: thread-safe without synchronization; we only read from this index, although we may write to solution indices
void	clear() Removes all data at once.
boolean	isEmpty()
boolean	remove(Query<K,V> query) Removes the given item from this index
boolean	remove(V[] tuple) Removes all matching tuples from solution indices.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

QueryIndex

public QueryIndex(QueryContext<K,V> queryContext)

Method Detail

clear

public void clear()

Description copied from interface: Index

Removes all data at once. It can be assumed that the data is no longer needed; this operation resets the index and releases the data for garbage collection.

Specified by:

clear in interface Index<Query<K,V>>

add

public void add(Query<K,V> query)

Description copied from interface: Index

Adds the given item to this index

Specified by:

add in interface Index<Query<K,V>>

Parameters:

query - the item to add

remove

public boolean remove(Query<K,V> query)

Description copied from interface: Index

Removes the given item from this index

Specified by:

remove in interface Index<Query<K,V>>

Parameters:

query - the item to remove

Returns:

whether an item was removed

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Index<Query<K,V>>

add

public boolean add(V[] tuple,
                   long expirationTime)

Note: the provided tuple is modified in the process of indexing Note: thread-safe without synchronization; we only read from this index, although we may write to solution indices

Parameters:

tuple - the tuple to index

expirationTime - the expiration time of the tuple, in milliseconds since the Unix epoch

Returns:

whether the tuple was added to any solution index

remove

public boolean remove(V[] tuple)

Removes all matching tuples from solution indices.

Parameters:

tuple - a tuple in which any element may be null, representing a wildcard

Returns:

whether any matching tuples were found and removed