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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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 "nsICacheInfoChannel.idl"
+
+interface nsIFile;
+
+/**
+ * A channel may optionally implement this interface to allow clients
+ * to affect its behavior with respect to how it uses the cache service.
+ *
+ * This interface provides:
+ * 1) Support for "stream as file" semantics (for JAR and plugins).
+ * 2) Support for "pinning" cached data in the cache (for printing and save-as).
+ * 3) Support for uniquely identifying cached data in cases when the URL
+ * is insufficient (e.g., HTTP form submission).
+ */
+[scriptable, builtinclass, uuid(dd1d6122-5ecf-4fe4-8f0f-995e7ab3121a)]
+interface nsICachingChannel : nsICacheInfoChannel
+{
+ /**
+ * Set/get the cache token... 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 QI'd to a nsICacheEntryInfo if more detail
+ * about the cache entry is needed (e.g., expiration time).
+ */
+ attribute nsISupports cacheToken;
+
+ /**
+ * Instructs the channel to only store the metadata of the entry, and not
+ * the content. When reading an existing entry, this automatically sets
+ * LOAD_ONLY_IF_MODIFIED flag.
+ * Must be called before asyncOpen().
+ */
+ attribute boolean cacheOnlyMetadata;
+
+ /**
+ * Tells the channel to use the pinning storage.
+ */
+ attribute boolean pin;
+
+ /**
+ * Overrides cache validation for a time specified in seconds.
+ *
+ * @param aSecondsToTheFuture
+ *
+ */
+ void forceCacheEntryValidFor(in unsigned long aSecondsToTheFuture);
+
+ /**************************************************************************
+ * Caching channel specific load flags:
+ */
+
+ /**
+ * 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.
+ */
+ const unsigned long LOAD_NO_NETWORK_IO = 1 << 26;
+
+ /**
+ * 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
+ * (i.e., it does not affect proxy caches).
+ */
+ const unsigned long LOAD_BYPASS_LOCAL_CACHE = 1 << 28;
+
+ /**
+ * This load flag causes the local cache to be skipped if the request
+ * would otherwise block waiting to access the cache.
+ */
+ const unsigned long LOAD_BYPASS_LOCAL_CACHE_IF_BUSY = 1 << 29;
+
+ /**
+ * 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.
+ */
+ const unsigned long LOAD_ONLY_FROM_CACHE = 1 << 30;
+
+ /**
+ * 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 nsICachingChannel::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.
+ */
+ const unsigned long LOAD_ONLY_IF_MODIFIED = 1 << 31;
+};