org.apache.ignite.cache.query

Class AbstractContinuousQuery<K,V>

java.lang.Object

org.apache.ignite.cache.query.Query<javax.cache.Cache.Entry<K,V>>

org.apache.ignite.cache.query.AbstractContinuousQuery<K,V>

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

ContinuousQuery, ContinuousQueryWithTransformer

public abstract class AbstractContinuousQuery<K,V>
extends Query<javax.cache.Cache.Entry<K,V>>

Base class for continuous query.

See Also:

ContinuousQuery, ContinuousQueryWithTransformer, Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static boolean	DFLT_AUTO_UNSUBSCRIBE Default value for automatic unsubscription flag.
static int	DFLT_PAGE_SIZE Default page size.
static long	DFLT_TIME_INTERVAL Maximum default time interval after which buffer will be flushed (if buffering is enabled).

Constructor Summary

Constructors

Constructor and Description
AbstractContinuousQuery()

Method Summary

Modifier and Type	Method and Description
Query<javax.cache.Cache.Entry<K,V>>	getInitialQuery() Gets initial query.
javax.cache.configuration.Factory<? extends javax.cache.event.CacheEntryEventFilter<K,V>>	getRemoteFilterFactory() Gets remote filter.
long	getTimeInterval() Gets time interval.
boolean	isAutoUnsubscribe() Gets automatic unsubscription flag value.
boolean	isIncludeExpired() Gets the flag value defining whether to notify about EventType.EXPIRED events.
AbstractContinuousQuery<K,V>	setAutoUnsubscribe(boolean autoUnsubscribe) Sets automatic unsubscribe flag.
void	setIncludeExpired(boolean includeExpired) Sets the flag value defining whether to notify about EventType.EXPIRED events.
AbstractContinuousQuery<K,V>	setInitialQuery(Query<javax.cache.Cache.Entry<K,V>> initQry) Sets initial query.
AbstractContinuousQuery<K,V>	setRemoteFilterFactory(javax.cache.configuration.Factory<? extends javax.cache.event.CacheEntryEventFilter<K,V>> rmtFilterFactory) Sets optional key-value filter factory.
AbstractContinuousQuery<K,V>	setTimeInterval(long timeInterval) Sets time interval.

Methods inherited from class org.apache.ignite.cache.query.Query

getPageSize, isLocal, prepare, setLocal, setPageSize, toString

Methods inherited from class java.lang.Object

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

Field Detail

DFLT_PAGE_SIZE

public static final int DFLT_PAGE_SIZE

Default page size. Size of 1 means that all entries will be sent to master node immediately (buffering is disabled).

See Also:

Constant Field Values

DFLT_TIME_INTERVAL

public static final long DFLT_TIME_INTERVAL

Maximum default time interval after which buffer will be flushed (if buffering is enabled).

See Also:

Constant Field Values

DFLT_AUTO_UNSUBSCRIBE

public static final boolean DFLT_AUTO_UNSUBSCRIBE

Default value for automatic unsubscription flag. Remote filters will be unregistered by default if master node leaves topology.

See Also:

Constant Field Values

Constructor Detail

AbstractContinuousQuery

public AbstractContinuousQuery()

Method Detail

setInitialQuery

public AbstractContinuousQuery<K,V> setInitialQuery(Query<javax.cache.Cache.Entry<K,V>> initQry)

Sets initial query.

This query will be executed before continuous listener is registered which allows to iterate through entries which already existed at the time continuous query is executed.

Parameters:

initQry - Initial query.

Returns:

this for chaining.

getInitialQuery

public Query<javax.cache.Cache.Entry<K,V>> getInitialQuery()

Gets initial query.

Returns:

Initial query.

setRemoteFilterFactory

public AbstractContinuousQuery<K,V> setRemoteFilterFactory(javax.cache.configuration.Factory<? extends javax.cache.event.CacheEntryEventFilter<K,V>> rmtFilterFactory)

Sets optional key-value filter factory. This factory produces filter is called before entry is sent to the master node.

WARNING: all operations that involve any kind of JVM-local or distributed locking (e.g., synchronization or transactional cache operations), should be executed asynchronously without blocking the thread that called the filter. Otherwise, you can get deadlocks.

If remote filter are annotated with IgniteAsyncCallback then it is executed in async callback pool (see IgniteConfiguration.getAsyncCallbackPoolSize()) that allow to perform a cache operations.

Parameters:

rmtFilterFactory - Key-value filter factory.

Returns:

this for chaining.

See Also:

IgniteAsyncCallback, IgniteConfiguration.getAsyncCallbackPoolSize()

getRemoteFilterFactory

public javax.cache.configuration.Factory<? extends javax.cache.event.CacheEntryEventFilter<K,V>> getRemoteFilterFactory()

Gets remote filter.

Returns:

Remote filter.

setTimeInterval

public AbstractContinuousQuery<K,V> setTimeInterval(long timeInterval)

Sets time interval.

When a cache update happens, entry is first put into a buffer. Entries from buffer will be sent to the master node only if the buffer is full (its size can be provided via Query.setPageSize(int) method) or time provided via this method is exceeded.

Default time interval is 0 which means that time check is disabled and entries will be sent only when buffer is full.

Parameters:

timeInterval - Time interval.

Returns:

this for chaining.

getTimeInterval

public long getTimeInterval()

Gets time interval.

Returns:

Time interval.

setAutoUnsubscribe

public AbstractContinuousQuery<K,V> setAutoUnsubscribe(boolean autoUnsubscribe)

Sets automatic unsubscribe flag.

This flag indicates that query filters on remote nodes should be automatically unregistered if master node (node that initiated the query) leaves topology. If this flag is false, filters will be unregistered only when the query is cancelled from master node, and won't ever be unregistered if master node leaves grid.

Default value for this flag is true.

Parameters:

autoUnsubscribe - Automatic unsubscription flag.

Returns:

this for chaining.

isAutoUnsubscribe

public boolean isAutoUnsubscribe()

Gets automatic unsubscription flag value.

Returns:

Automatic unsubscription flag.

setIncludeExpired

public void setIncludeExpired(boolean includeExpired)

Sets the flag value defining whether to notify about EventType.EXPIRED events. If true, then the remote listener will get notifications about entries expired in cache. Otherwise, only EventType.CREATED, EventType.UPDATED and EventType.REMOVED events will be fired in the remote listener.

This flag is false by default, so EventType.EXPIRED events are disabled.

Parameters:

includeExpired - Whether to notify about EventType.EXPIRED events.

isIncludeExpired

public boolean isIncludeExpired()

Gets the flag value defining whether to notify about EventType.EXPIRED events.

Returns:

Whether to notify about EventType.EXPIRED events.