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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 "nsISupports.idl"
+
+%{C++
+// Forward-declare mozilla::net::SpdyPushCache
+namespace mozilla {
+namespace net {
+class SpdyPushCache;
+}
+}
+%}
+
+interface nsILoadGroup;
+interface nsIChannel;
+interface nsIStreamListener;
+
+[ptr] native SpdyPushCachePtr(mozilla::net::SpdyPushCache);
+
+/**
+ * Requests capable of tail-blocking must implement this
+ * interfaces (typically channels).
+ * If the request is tail-blocked, it will be held in its request
+ * context queue until unblocked.
+ */
+[uuid(7EB361D4-37A5-42C9-AFAE-F6C88FE7C394)]
+interface nsIRequestTailUnblockCallback : nsISupports
+{
+ /**
+ * Called when the requests is unblocked and proceed.
+ * @param result
+ * NS_OK - the request is OK to go, unblocking is not
+ * caused by cancelation of the request.
+ * any error - the request must behave as it were canceled
+ * with the result as status.
+ */
+ void onTailUnblock(in nsresult aResult);
+};
+
+/**
+ * The nsIRequestContext is used to maintain state about connections
+ * that are in some way associated with each other (often by being part
+ * of the same load group) and how they interact with blocking items like
+ * HEAD css/js loads.
+ *
+ * This used to be known as nsILoadGroupConnectionInfo and nsISchedulingContext.
+ */
+[uuid(658e3e6e-8633-4b1a-8d66-fa9f72293e63)]
+interface nsIRequestContext : nsISupports
+{
+ /**
+ * A unique identifier for this request context
+ */
+ [notxpcom, nostdcall] readonly attribute unsigned long long ID;
+
+ /**
+ * Called by the associated document when its load starts. This resets
+ * context's internal states.
+ */
+ void beginLoad();
+
+ /**
+ * Called when the associated document notified the DOMContentLoaded event.
+ */
+ void DOMContentLoaded();
+
+ /**
+ * Number of active blocking transactions associated with this context
+ */
+ readonly attribute unsigned long blockingTransactionCount;
+
+ /**
+ * Increase the number of active blocking transactions associated
+ * with this context by one.
+ */
+ void addBlockingTransaction();
+
+ /**
+ * Decrease the number of active blocking transactions associated
+ * with this context by one. The return value is the number of remaining
+ * blockers.
+ */
+ unsigned long removeBlockingTransaction();
+
+ /**
+ * This gives out a weak pointer to the push cache.
+ * The nsIRequestContext implementation owns the cache
+ * and will destroy it when overwritten or when the context
+ * ends.
+ */
+ [notxpcom,nostdcall] attribute SpdyPushCachePtr spdyPushCache;
+
+ /**
+ * Increases/decrease the number of non-tailed requests in this context.
+ * If the count drops to zero, all tail-blocked callbacks are notified
+ * shortly after that to be unblocked.
+ */
+ void addNonTailRequest();
+ void removeNonTailRequest();
+
+ /**
+ * If the request context is in tail-blocked state, the callback
+ * is queued and result is true. The callback will be notified
+ * about tail-unblocking or when the request context is canceled.
+ */
+ [must_use] boolean isContextTailBlocked(in nsIRequestTailUnblockCallback callback);
+
+ /**
+ * Called when the request is sitting in the tail queue but has been
+ * canceled before untailing. This just removes the request from the
+ * queue so that it is not notified on untail and not referenced.
+ */
+ void cancelTailedRequest(in nsIRequestTailUnblockCallback request);
+
+ /**
+ * This notifies all queued tail-blocked requests, they will be notified
+ * aResult and released afterwards. Called by the load group when
+ * it's canceled.
+ */
+ void cancelTailPendingRequests(in nsresult aResult);
+};
+
+/**
+ * The nsIRequestContextService is how anyone gets access to a request
+ * context when they haven't been explicitly given a strong reference to an
+ * existing one. It is responsible for creating and handing out strong
+ * references to nsIRequestContexts, but only keeps weak references itself.
+ * The shared request context will go away once no one else is keeping a
+ * reference to it. If you ask for a request context that has no one else
+ * holding a reference to it, you'll get a brand new request context. Anyone
+ * who asks for the same request context while you're holding a reference
+ * will get a reference to the same request context you have.
+ */
+[uuid(7fcbf4da-d828-4acc-b144-e5435198f727)]
+interface nsIRequestContextService : nsISupports
+{
+ /**
+ * Get an existing request context from its ID
+ */
+ nsIRequestContext getRequestContext(in unsigned long long id);
+ /**
+ * Shorthand to get request context from a load group
+ */
+ nsIRequestContext getRequestContextFromLoadGroup(in nsILoadGroup lg);
+
+ /**
+ * Create a new request context
+ */
+ nsIRequestContext newRequestContext();
+
+ /**
+ * Remove an existing request context from its ID
+ */
+ void removeRequestContext(in unsigned long long id);
+};