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80 lines
3.5 KiB
Plaintext
80 lines
3.5 KiB
Plaintext
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsISupports.idl"
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interface nsICacheEntry;
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[scriptable, uuid(1fc9fe11-c6ac-4748-94bd-8555a5a12b94)]
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interface nsICacheEntryOpenCallback : nsISupports
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{
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/**
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* State of the entry determined by onCacheEntryCheck.
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*
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* ENTRY_WANTED - the consumer is interested in the entry, we will pass it.
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* RECHECK_AFTER_WRITE_FINISHED - the consumer cannot use the entry while data is
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* still being written and wants to check it again after the current write is
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* finished. This actually prevents concurrent read/write and is used with
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* non-resumable HTTP responses.
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* ENTRY_NEEDS_REVALIDATION - entry needs to be revalidated first with origin server,
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* this means the loading channel will decide whether to use the entry content
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* as is after it gets a positive response from the server about validity of the
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* content ; when a new content needs to be loaded from the server, the loading
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* channel opens a new entry with OPEN_TRUNCATE flag which dooms the one
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* this check has been made for.
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* ENTRY_NOT_WANTED - the consumer is not interested in the entry, we will not pass it.
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*/
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const unsigned long ENTRY_WANTED = 0;
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const unsigned long RECHECK_AFTER_WRITE_FINISHED = 1;
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const unsigned long ENTRY_NEEDS_REVALIDATION = 2;
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const unsigned long ENTRY_NOT_WANTED = 3;
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/**
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* Callback to perform any validity checks before the entry should be used.
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* Called before onCacheEntryAvailable callback, depending on the result it
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* may be called more then one time.
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*
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* This callback is ensured to be called on the same thread on which asyncOpenURI
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* has been called, unless nsICacheStorage.CHECK_MULTITHREADED flag has been specified.
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* In that case this callback can be invoked on any thread, usually it is the cache I/O
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* or cache management thread.
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*
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* IMPORTANT NOTE:
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* This callback may be invoked sooner then respective asyncOpenURI call exits.
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*
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* @param aEntry
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* An entry to examine. Consumer has a chance to decide whether the
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* entry is valid or not.
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* @return
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* State of the entry, see the constants just above.
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*/
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unsigned long onCacheEntryCheck(in nsICacheEntry aEntry);
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/**
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* Callback giving actual result of asyncOpenURI. It may give consumer the cache
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* entry or a failure result when it's not possible to open it from some reason.
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* This callback is ensured to be called on the same thread on which asyncOpenURI
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* has been called.
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*
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* IMPORTANT NOTE:
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* This callback may be invoked sooner then respective asyncOpenURI call exits.
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*
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* @param aEntry
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* The entry bound to the originally requested URI.
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* @param aNew
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* Whether no data so far has been stored for this entry, i.e. reading
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* it will just fail. When aNew is true, a server request should be
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* made and data stored to this new entry.
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* @param aResult
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* Result of the request. This may be a failure only when one of these
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* issues occur:
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* - the cache storage service could not be started due to some unexpected
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* faulure
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* - there is not enough disk space to create new entries
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*/
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void onCacheEntryAvailable(in nsICacheEntry aEntry,
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in boolean aNew,
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in nsresult aResult);
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};
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