Package org.apache.geode.modules.session.catalina.callback

Class LocalSessionCacheWriter

java.lang.Object

org.apache.geode.cache.util.CacheWriterAdapter<String,jakarta.servlet.http.HttpSession>

org.apache.geode.modules.session.catalina.callback.LocalSessionCacheWriter

All Implemented Interfaces:

CacheCallback, CacheWriter<String,jakarta.servlet.http.HttpSession>, Declarable

public class LocalSessionCacheWriter
extends CacheWriterAdapter<String,jakarta.servlet.http.HttpSession>
implements Declarable

Constructor Summary

Constructors

Constructor	Description
LocalSessionCacheWriter(Region<String,jakarta.servlet.http.HttpSession> backingRegion)

Method Summary

Modifier and Type	Method	Description
void	beforeCreate(EntryEvent<String,jakarta.servlet.http.HttpSession> event)	Called before an entry is created.
void	beforeDestroy(EntryEvent<String,jakarta.servlet.http.HttpSession> event)	Called before an entry is destroyed.
void	beforeUpdate(EntryEvent<String,jakarta.servlet.http.HttpSession> event)	Called before an entry is updated.
void	close()	Called when the region containing this callback is closed or destroyed, when the cache is closed, or when a callback is removed from a region using an AttributesMutator.

Methods inherited from class org.apache.geode.cache.util.CacheWriterAdapter

beforeRegionClear, beforeRegionDestroy

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.geode.cache.Declarable

init, initialize

Constructor Details

LocalSessionCacheWriter

public LocalSessionCacheWriter(Region<String,jakarta.servlet.http.HttpSession> backingRegion)

Method Details

beforeCreate

public void beforeCreate(EntryEvent<String,jakarta.servlet.http.HttpSession> event)
                  throws CacheWriterException

Description copied from interface: CacheWriter

Called before an entry is created. Entry creation is initiated by a create, a put, or a get. The CacheWriter can determine whether this value comes from a get or not by evaluating the Operation's Operation.isLoad() method. The entry being created may already exist in the local cache where this CacheWriter is installed, but it does not yet exist in the cache where the operation was initiated.

Specified by:

beforeCreate in interface CacheWriter<String,jakarta.servlet.http.HttpSession>

Overrides:

beforeCreate in class CacheWriterAdapter<String,jakarta.servlet.http.HttpSession>

Parameters:

event - an EntryEvent that provides information about the operation in progress

Throws:

CacheWriterException - if thrown will abort the operation in progress, and the exception will be propagated back to caller that initiated the operation

See Also:

• Region.create(Object, Object)
• Region.put(Object, Object)
• Region.get(Object)

beforeUpdate

public void beforeUpdate(EntryEvent<String,jakarta.servlet.http.HttpSession> event)
                  throws CacheWriterException

Description copied from interface: CacheWriter

Called before an entry is updated. The entry update is initiated by a put or a get that causes the loader to update an existing entry. The entry previously existed in the cache where the operation was initiated, although the old value may have been null. The entry being updated may or may not exist in the local cache where the CacheWriter is installed.

Specified by:

beforeUpdate in interface CacheWriter<String,jakarta.servlet.http.HttpSession>

Overrides:

beforeUpdate in class CacheWriterAdapter<String,jakarta.servlet.http.HttpSession>

Parameters:

event - an EntryEvent that provides information about the operation in progress

Throws:

CacheWriterException - if thrown will abort the operation in progress, and the exception will be propagated back to caller that initiated the operation

See Also:

• Region.put(Object, Object)
• Region.get(Object)

beforeDestroy

public void beforeDestroy(EntryEvent<String,jakarta.servlet.http.HttpSession> event)
                   throws CacheWriterException

Description copied from interface: CacheWriter

Called before an entry is destroyed. The entry being destroyed may or may not exist in the local cache where the CacheWriter is installed. This method is not called as a result of expiration or Region.localDestroy(Object).

Specified by:

beforeDestroy in interface CacheWriter<String,jakarta.servlet.http.HttpSession>

Overrides:

beforeDestroy in class CacheWriterAdapter<String,jakarta.servlet.http.HttpSession>

Parameters:

event - an EntryEvent that provides information about the operation in progress

Throws:

CacheWriterException - if thrown will abort the operation in progress, and the exception will be propagated back to caller that initiated the operation

See Also:

• Region.destroy(Object)

close

public void close()

Description copied from interface: CacheCallback

Called when the region containing this callback is closed or destroyed, when the cache is closed, or when a callback is removed from a region using an AttributesMutator.

Implementations should cleanup any external resources such as database connections. Any runtime exceptions this method throws will be logged.

It is possible for this method to be called multiple times on a single callback instance, so implementations must be tolerant of this.

Specified by:

close in interface CacheCallback

Overrides:

close in class CacheWriterAdapter<String,jakarta.servlet.http.HttpSession>

See Also:

• RegionService.close()
• Region.close()
• Region.localDestroyRegion()
• Region.destroyRegion()
• AttributesMutator