ICaching

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netwerk/base/public/nsICachingChannel.idlScriptable

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Inherits from: nsICacheInfoChannelLast changed in Gecko 2.0 (Firefox 4 / Thunderbird 3.3 / SeaMonkey 2.1)

This interface provides:

Support for 'stream as file' semantics (for JAR and plugins).
Support for 'pinning' cached data in the cache (for printing and save-as).
Support for uniquely identifying cached data in cases when the URL is insufficient. For example a HTTP form submission.

A channel may optionally implement this interface to allow clients to affect its behavior with respect to how it uses the cache service.

Caching Issue

Method overview

Attributes

Attribute	Type	Description
`cacheAsFile`	`boolean`	Specifies whether or not the data should be cached to a file. This may fail if the disk cache is not present. The value of this attribute is usually only settable during the processing of a channel's `OnStartRequest`. The default value of this attribute depends on the particular implementation of `nsICachingChannel`.
`cacheFile`	`nsIFile`	Get the 'file' where the cached data can be found. This is valid for as long as a reference to the cache token is held. This may return an error if `cacheAsFile` is `false`. Read only.
`cacheForOfflineUse`	`boolean`	Specifies whether or not the data should be placed in the offline cache, in addition to normal memory/disk caching. This may fail if the offline cache is not present. The value of this attribute should be set before opening the channel.
`cacheKey`	`nsISupports`	Uniquely identifies the data in the cache for this channel. Holding a reference to this key does not prevent the cached data from being removed. A cache key retrieved from a particular instance of `nsICachingChannel` could be set on another instance of `nsICachingChannel` provided the underlying implementations are compatible and provided the new channel instance was created with the same URI. The implementation of `nsICachingChannel` would be expected to use the cache entry identified by the cache token. Depending on the value of `nsIRequest.loadFlags()`, the cache entry may be validated, overwritten, or simply read. The cache key may be `null` indicating that the URI of the channel is sufficient to locate the same cache entry. Setting a `null` cache key is likewise valid.
`cacheToken`	`nsISupports`	Uniquely identifies the data in the cache. Holding a reference to this token prevents the cached data from being removed. A cache token retrieved from a particular instance of `nsICachingChannel` could be set on another instance of `nsICachingChannel` provided the underlying implementations are compatible. The implementation of `nsICachingChannel` would be expected to only read from the cache entry identified by the cache token and not try to validate it. The cache token can be `QueryInterface`'d to a `nsICacheEntryInfo` if more detail about the cache entry is needed. For example, expiration time.
`offlineCacheClientID`	`ACString`	The session into which to cache offline data. If not specified, data will be placed in 'HTTP-offline'.
`offlineCacheToken`	`nsISupports`	The same as `cacheToken` but accessing the offline app cache token if there is any. Exceptions thrown `NS_ERROR_NOT_AVAILABLE` When there is not offline cache token.

Constants

Constant	Value	Description
`LOAD_NO_NETWORK_IO`	`1 << 26`	This load flag inhibits fetching from the net. An error of `NS_ERROR_DOCUMENT_NOT_CACHED` will be sent to the listener's `onStopRequest` if network IO is necessary to complete the request. This flag can be used to find out whether fetching this URL would cause validation of the cache entry via the network. Combining this flag with `LOAD_BYPASS_LOCAL_CACHE` will cause all loads to fail. This flag differs from `LOAD_ONLY_FROM_CACHE` in that this flag fails the load if validation is required while `LOAD_ONLY_FROM_CACHE` skips validation where possible.
`LOAD_CHECK_OFFLINE_CACHE`	`1 << 27`	This load flag causes the offline cache to be checked when fetching a request. It will be set automatically if the browser is offline. This flag will not be transferred through a redirect.
`LOAD_BYPASS_LOCAL_CACHE`	`1 << 28`	This load flag causes the local cache to be skipped when fetching a request. Unlike `LOAD_BYPASS_CACHE`, it does not force an end-to-end load (That is, it does not affect proxy caches).
`LOAD_BYPASS_LOCAL_CACHE_IF_BUSY`	`1 << 29`	This load flag causes the local cache to be skipped if the request would otherwise block waiting to access the cache.
`LOAD_ONLY_FROM_CACHE`	`1 << 30`	This load flag inhibits fetching from the net if the data in the cache has been evicted. An error of `NS_ERROR_DOCUMENT_NOT_CACHED` will be sent to the listener's `onStopRequest` in this case. This flag is set automatically when the application is offline.
`LOAD_ONLY_IF_MODIFIED`	`1 << 31`	This load flag controls what happens when a document would be loaded from the cache to satisfy a call to `AsyncOpen`. If this attribute is set to `true`, then the document will not be loaded from the cache. A stream listener can check `isFromCache()` to determine if the `AsyncOpen` will actually result in data being streamed. If this flag has been set, and the request can be satisfied via the cache, then the `OnDataAvailable` events will be skipped. The listener will only see `OnStartRequest` followed by `OnStopRequest`.

Methods

isFromCache()

Obsolete since Gecko 2.0 (Firefox 4 / Thunderbird 3.3 / SeaMonkey 2.1)

This method finds out whether or not this channel's data is being loaded from the cache.

Parameters

None.

Caching Definition

Return value

Catching Hell

Returns true if this channel's data is being loaded from the cache, otherwise returns false. This value is undefined before the channel fires its OnStartRequest notification and after the channel fires its OnStopRequest notification.

Import - Import GPX-files with geocache data straight from Geocaching.com from within the app, import GPX or LOC files using the import button, or drag-and-drop them into iCaching. Each GPX file will be imported into its own folder. iCaching also supports the Geocaching Live API. You can query the geocaching.com database straight from within iCaching.
Organize, manage, and explore - Explore your whole cache library with the special 'Library' folders. Extra waypoints (for multi's) are added to the cache and visible on the waypoints-tab. View the cache(s) on a map with or without additional waypoints and/or your home-location. An extended search-pane helps you to sort out your caches by all properties of the cache. iCaching can contain multiple home- or center-locations and calculates distance and bearing on the fly. Add your own notes and like or dislike a cache. You can also add and remove favorite-points. GCVote is build in. iCaching queries for GCVote on every import, and you can rate a cache on GCVote when you have a GCVote-account.
Export - iCaching can export to GPX and to a lot of other file-formats (e.g., CSV, HTML, POI, etc.). You can also export directly to a whole list of GPS-devices (Garmin, Magellan, DeLorme), including paperless devices such as the Garmin Oregon series.

Caching Caves Puzzle Pieces

Note: To make usage of the entire range of iCaching functionalities, you need a premium membership at geocaching.com.

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