mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-04 02:57:38 +00:00
255 lines
8.3 KiB
Plaintext
255 lines
8.3 KiB
Plaintext
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#include "nsISupports.idl"
|
|
|
|
interface nsIInputStream;
|
|
interface nsIOutputStream;
|
|
interface nsICacheEntryDoomCallback;
|
|
|
|
// ************************ REMOVE **********************
|
|
typedef long nsCacheAccessMode;
|
|
typedef long nsCacheStoragePolicy;
|
|
|
|
interface nsICacheListener;
|
|
interface nsIFile;
|
|
interface nsICacheEntryMetaDataVisitor;
|
|
|
|
[scriptable, uuid(607c2a2c-0a48-40b9-a956-8cf2bb9857cf)]
|
|
interface nsICacheEntry : nsISupports
|
|
{
|
|
/**
|
|
* Placeholder for the initial value of expiration time.
|
|
*/
|
|
const unsigned long NO_EXPIRATION_TIME = 0xFFFFFFFF;
|
|
|
|
/**
|
|
* Get the key identifying the cache entry.
|
|
*/
|
|
readonly attribute ACString key;
|
|
|
|
/**
|
|
* Whether the entry is memory/only or persisted to disk.
|
|
* Note: private browsing entries are reported as persistent for consistency
|
|
* while are not actually persisted to disk.
|
|
*/
|
|
readonly attribute boolean persistent;
|
|
|
|
/**
|
|
* Get the number of times the cache entry has been opened.
|
|
*/
|
|
readonly attribute long fetchCount;
|
|
|
|
/**
|
|
* Get the last time the cache entry was opened (in seconds since the Epoch).
|
|
*/
|
|
readonly attribute uint32_t lastFetched;
|
|
|
|
/**
|
|
* Get the last time the cache entry was modified (in seconds since the Epoch).
|
|
*/
|
|
readonly attribute uint32_t lastModified;
|
|
|
|
/**
|
|
* Get the expiration time of the cache entry (in seconds since the Epoch).
|
|
*/
|
|
readonly attribute uint32_t expirationTime;
|
|
|
|
/**
|
|
* Set the time at which the cache entry should be considered invalid (in
|
|
* seconds since the Epoch).
|
|
*/
|
|
void setExpirationTime(in uint32_t expirationTime);
|
|
|
|
/**
|
|
* This method is intended to override the per-spec cache validation
|
|
* decisions for a duration specified in seconds. The current state can
|
|
* be examined with isForcedValid (see below). This value is not persisted,
|
|
* so it will not survive session restart. Cache entries that are forced valid
|
|
* will not be evicted from the cache for the duration of forced validity.
|
|
* This means that there is a potential problem if the number of forced valid
|
|
* entries grows to take up more space than the cache size allows.
|
|
*
|
|
* @param aSecondsToTheFuture
|
|
* the number of seconds the default cache validation behavior will be
|
|
* overridden before it returns to normal
|
|
*/
|
|
void forceValidFor(in unsigned long aSecondsToTheFuture);
|
|
|
|
/**
|
|
* The state variable for whether this entry is currently forced valid.
|
|
* Defaults to false for normal cache validation behavior, and will return
|
|
* true if the number of seconds set by forceValidFor() has yet to be reached.
|
|
*/
|
|
readonly attribute boolean isForcedValid;
|
|
|
|
/**
|
|
* Open blocking input stream to cache data. Use the stream transport
|
|
* service to asynchronously read this stream on a background thread.
|
|
* The returned stream MAY implement nsISeekableStream.
|
|
*
|
|
* @param offset
|
|
* read starting from this offset into the cached data. an offset
|
|
* beyond the end of the stream has undefined consequences.
|
|
*
|
|
* @return non-blocking, buffered input stream.
|
|
*/
|
|
nsIInputStream openInputStream(in long long offset);
|
|
|
|
/**
|
|
* Open non-blocking output stream to cache data. The returned stream
|
|
* MAY implement nsISeekableStream.
|
|
*
|
|
* If opening an output stream to existing cached data, the data will be
|
|
* truncated to the specified offset.
|
|
*
|
|
* @param offset
|
|
* write starting from this offset into the cached data. an offset
|
|
* beyond the end of the stream has undefined consequences.
|
|
*
|
|
* @return blocking, buffered output stream.
|
|
*/
|
|
nsIOutputStream openOutputStream(in long long offset);
|
|
|
|
/**
|
|
* Stores the Content-Length specified in the HTTP header for this
|
|
* entry. Checked before we write to the cache entry, to prevent ever
|
|
* taking up space in the cache for an entry that we know up front
|
|
* is going to have to be evicted anyway. See bug 588507.
|
|
*/
|
|
attribute int64_t predictedDataSize;
|
|
|
|
/**
|
|
* Get/set security info on the cache entry for this descriptor.
|
|
*/
|
|
attribute nsISupports securityInfo;
|
|
|
|
/**
|
|
* Get the size of the cache entry data, as stored. This may differ
|
|
* from the entry's dataSize, if the entry is compressed.
|
|
*/
|
|
readonly attribute unsigned long storageDataSize;
|
|
|
|
/**
|
|
* Asynchronously doom an entry. Listener will be notified about the status
|
|
* of the operation. Null may be passed if caller doesn't care about the
|
|
* result.
|
|
*/
|
|
void asyncDoom(in nsICacheEntryDoomCallback listener);
|
|
|
|
/**
|
|
* Methods for accessing meta data. Meta data is a table of key/value
|
|
* string pairs. The strings do not have to conform to any particular
|
|
* charset, but they must be null terminated.
|
|
*/
|
|
string getMetaDataElement(in string key);
|
|
void setMetaDataElement(in string key, in string value);
|
|
|
|
/**
|
|
* Obtain the list of metadata keys this entry keeps.
|
|
*
|
|
* NOTE: The callback is invoked under the CacheFile's lock. It means
|
|
* there should not be made any calls to the entry from the visitor and
|
|
* if the values need to be processed somehow, it's better to cache them
|
|
* and process outside the callback.
|
|
*/
|
|
void visitMetaData(in nsICacheEntryMetaDataVisitor visitor);
|
|
|
|
/**
|
|
* Claims that all metadata on this entry are up-to-date and this entry
|
|
* now can be delivered to other waiting consumers.
|
|
*
|
|
* We need such method since metadata must be delivered synchronously.
|
|
*/
|
|
void metaDataReady();
|
|
|
|
/**
|
|
* Called by consumer upon 304/206 response from the server. This marks
|
|
* the entry content as positively revalidated.
|
|
* Consumer uses this method after the consumer has returned ENTRY_NEEDS_REVALIDATION
|
|
* result from onCacheEntryCheck and after successfull revalidation with the server.
|
|
*/
|
|
void setValid();
|
|
|
|
/**
|
|
* Doom this entry and open a new, empty, entry for write. Consumer has
|
|
* to exchange the entry this method is called on for the newly created.
|
|
* Used on 200 responses to conditional requests.
|
|
*
|
|
* @param aMemoryOnly
|
|
* - whether the entry is to be created as memory/only regardless how
|
|
* the entry being recreated persistence is set
|
|
* @returns
|
|
* - an entry that can be used to write to
|
|
* @throws
|
|
* - NS_ERROR_NOT_AVAILABLE when the entry cannot be from some reason
|
|
* recreated for write
|
|
*/
|
|
nsICacheEntry recreate([optional] in boolean aMemoryOnly);
|
|
|
|
/**
|
|
* Returns the length of data this entry holds.
|
|
* @throws
|
|
* NS_ERROR_IN_PROGRESS when the write is still in progress.
|
|
*/
|
|
readonly attribute long long dataSize;
|
|
|
|
/****************************************************************************
|
|
* The following methods might be added to some nsICacheEntryInternal
|
|
* interface since we want to remove them as soon as the old cache backend is
|
|
* completely removed.
|
|
*/
|
|
|
|
/**
|
|
* @deprecated
|
|
* FOR BACKWARD COMPATIBILITY ONLY
|
|
* When the old cache backend is eventually removed, this method
|
|
* can be removed too.
|
|
*
|
|
* In the new backend: this method is no-op
|
|
* In the old backend: this method delegates to nsICacheEntryDescriptor.close()
|
|
*/
|
|
void close();
|
|
|
|
/**
|
|
* @deprecated
|
|
* FOR BACKWARD COMPATIBILITY ONLY
|
|
* Marks the entry as valid so that others can use it and get only readonly
|
|
* access when the entry is held by the 1st writer.
|
|
*/
|
|
void markValid();
|
|
|
|
/**
|
|
* @deprecated
|
|
* FOR BACKWARD COMPATIBILITY ONLY
|
|
* Marks the entry as valid when write access is acquired.
|
|
*/
|
|
void maybeMarkValid();
|
|
|
|
/**
|
|
* @deprecated
|
|
* FOR BACKWARD COMPATIBILITY ONLY / KINDA HACK
|
|
* @param aWriteAllowed
|
|
* Consumer indicates whether write to the entry is allowed for it.
|
|
* Depends on implementation how the flag is handled.
|
|
* @returns
|
|
* true when write access is acquired for this entry,
|
|
* false otherwise
|
|
*/
|
|
boolean hasWriteAccess(in boolean aWriteAllowed);
|
|
};
|
|
|
|
/**
|
|
* Argument for nsICacheEntry.visitMetaData, provides access to all metadata
|
|
* keys and values stored on the entry.
|
|
*/
|
|
[scriptable, uuid(fea3e276-6ba5-4ceb-a581-807d1f43f6d0)]
|
|
interface nsICacheEntryMetaDataVisitor : nsISupports
|
|
{
|
|
/**
|
|
* Called over each key / value pair.
|
|
*/
|
|
void onMetaDataElement(in string key, in string value);
|
|
};
|