org.apache.river.outrigger

Class OutriggerServerImpl.ContentsQuery

java.lang.Object

org.apache.river.outrigger.OutriggerServerImpl.ContentsQuery

All Implemented Interfaces:

LeasedResource

Enclosing class:

OutriggerServerImpl

private class OutriggerServerImpl.ContentsQuery
extends Object
implements LeasedResource

Object that keeps the current state of contents queries. Holds the expiration time as well as the current state of the iteration.

Field Summary

Fields

Modifier and Type	Field and Description
private Iterator	classesIterator An iteration into classes
private EntryHolder.ContinuingQuery	currentQuery The current ContinuingQuery
private long	expiration The current expiration time
private EntryRep[]	lastBatch Last batch of entries returned
private Uuid	lastEntry Uuid of the last entry returned
private Object	lock Lock to prevent concurrent calls to nextBatch
private Set<EntryHandle>	provisionallyRemovedEntrySet Set of entries that we have encountered that have been provisionally removed
private long	remaining Number of elements left to return before reaching the the client specified limit
private EntryRep[]	tmpls The complete set of templates
private Txn	txn The transaction the query is being performed under
private Uuid	uuid Uuid associated with this query and its lease

Constructor Summary

Constructors

Modifier	Constructor and Description
private	ContentsQuery(Uuid uuid, EntryRep[] tmpls, Txn txn, long limit)

Method Summary

Modifier and Type	Method and Description
private boolean	advanceCurrentQuery(long now)
private boolean	cancel() Remove this query, assumes caller holds lock on this object.
Uuid	getCookie() Returns the universally unique identifier associated with this lease.
long	getExpiration() Returns the expiration time of the lease.
private EntryRep[]	nextBatch(Uuid lastReceived, long now)
void	setExpiration(long newExpiration) Changes the expiration time of the lease.

Methods inherited from class java.lang.Object

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

Field Detail

uuid

private final Uuid uuid

Uuid associated with this query and its lease

classesIterator

private final Iterator classesIterator

An iteration into classes

tmpls

private final EntryRep[] tmpls

The complete set of templates

txn

private final Txn txn

The transaction the query is being performed under

lock

private final Object lock

Lock to prevent concurrent calls to nextBatch

expiration

private volatile long expiration

The current expiration time

currentQuery

private EntryHolder.ContinuingQuery currentQuery

The current ContinuingQuery

remaining

private long remaining

Number of elements left to return before reaching the the client specified limit

lastEntry

private Uuid lastEntry

Uuid of the last entry returned

lastBatch

private EntryRep[] lastBatch

Last batch of entries returned

provisionallyRemovedEntrySet

private final Set<EntryHandle> provisionallyRemovedEntrySet

Set of entries that we have encountered that have been provisionally removed

Constructor Detail

ContentsQuery

private ContentsQuery(Uuid uuid,
                      EntryRep[] tmpls,
                      Txn txn,
                      long limit)

Method Detail

advanceCurrentQuery

private boolean advanceCurrentQuery(long now)

nextBatch

private EntryRep[] nextBatch(Uuid lastReceived,
                             long now)
                      throws TransactionException

Throws:

TransactionException

cancel

private boolean cancel()

Remove this query, assumes caller holds lock on this object. Returns true if query has not been already removed.

setExpiration

public void setExpiration(long newExpiration)

Description copied from interface: LeasedResource

Changes the expiration time of the lease.

Specified by:

setExpiration in interface LeasedResource

Parameters:

newExpiration - The new expiration time in milliseconds since the beginning of the epoch

getExpiration

public long getExpiration()

Description copied from interface: LeasedResource

Returns the expiration time of the lease.

Specified by:

getExpiration in interface LeasedResource

Returns:

The expiration time in milliseconds since the beginning of the epoch

getCookie

public Uuid getCookie()

Description copied from interface: LeasedResource

Returns the universally unique identifier associated with this lease. Any proxies for this lease that implement ReferentUuid should return this object from their getReferentUuid method and should base their implementation of equals on this object.

Specified by:

getCookie in interface LeasedResource