com.atlassian.confluence.impl.content.render.prefetch

Class AttachmentPrefetcher

java.lang.Object

com.atlassian.confluence.impl.content.render.prefetch.AttachmentPrefetcher

All Implemented Interfaces:

ResourcePrefetcher<AttachmentResourceIdentifier>

public class AttachmentPrefetcher
extends Object
implements ResourcePrefetcher<AttachmentResourceIdentifier>

Responsible for pre-fetching attachments and storing them in the conversion context for later retrieval by the rendering pipeline.

Since:

5.10

Constructor Summary

Constructors

Constructor and Description
AttachmentPrefetcher(AttachmentManager attachmentManager, com.atlassian.event.api.EventPublisher eventPublisher, ImageDetailsPrefetchDao imageDetailsPrefetcher)

Method Summary

Modifier and Type	Method and Description
Class<AttachmentResourceIdentifier>	getResourceItentifierType()
void	prefetch(Set<AttachmentResourceIdentifier> attachmentIdentifiers, ConversionContext conversionContext) Fetch the attachments for the given set of identifiers, and store them in the given conversion context.
static Function<AttachmentResourceIdentifier,Optional<Attachment>>	prefetchedAttachments(ConversionContext conversionContext)

Methods inherited from class java.lang.Object

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

Constructor Detail

AttachmentPrefetcher

public AttachmentPrefetcher(AttachmentManager attachmentManager,
                            com.atlassian.event.api.EventPublisher eventPublisher,
                            ImageDetailsPrefetchDao imageDetailsPrefetcher)

Method Detail

prefetchedAttachments

@Nonnull
public static Function<AttachmentResourceIdentifier,Optional<Attachment>> prefetchedAttachments(ConversionContext conversionContext)

Returns:

a function that can be used to retrieve pre-fetched attachments for the given conversion context

getResourceItentifierType

public Class<AttachmentResourceIdentifier> getResourceItentifierType()

Specified by:

getResourceItentifierType in interface ResourcePrefetcher<AttachmentResourceIdentifier>

Returns:

The type of resource identifier which this prefetcher can handle

prefetch

public void prefetch(Set<AttachmentResourceIdentifier> attachmentIdentifiers,
                     ConversionContext conversionContext)

Fetch the attachments for the given set of identifiers, and store them in the given conversion context.

It is possible and valid that some of the attachment identifiers refer to attachments on pages other than the page being rendered. However, this is expected to be a relatively unusual case. In the interests of simplicity, and given that this stuff is just an optimization, we only pre-fetch attachments for the current page. Any attachments from other pages will therefore need to be fetched on-demand by the renderer as usual.

Specified by:

prefetch in interface ResourcePrefetcher<AttachmentResourceIdentifier>

Parameters:

attachmentIdentifiers - The set of attachment identifiers that should be prefetched if possible