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+/* vim: set ts=2 sts=2 et sw=2: */
+/* 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 nsIURI;
+interface nsILoadContext;
+interface nsINetworkPredictorVerifier;
+
+typedef unsigned long PredictorPredictReason;
+typedef unsigned long PredictorLearnReason;
+
+/**
+ * nsINetworkPredictor - learn about pages users visit, and allow us to take
+ * predictive actions upon future visits.
+ * NOTE: nsINetworkPredictor should only
+ * be used on the main thread.
+ */
+[scriptable, uuid(acc88e7c-3f39-42c7-ac31-6377c2c3d73e)]
+interface nsINetworkPredictor : nsISupports
+{
+ /**
+ * Prediction reasons
+ *
+ * PREDICT_LINK - we are being asked to take predictive action because
+ * the user is hovering over a link.
+ *
+ * PREDICT_LOAD - we are being asked to take predictive action because
+ * the user has initiated a pageload.
+ *
+ * PREDICT_STARTUP - we are being asked to take predictive action
+ * because the browser is starting up.
+ */
+ const PredictorPredictReason PREDICT_LINK = 0;
+ const PredictorPredictReason PREDICT_LOAD = 1;
+ const PredictorPredictReason PREDICT_STARTUP = 2;
+
+ /**
+ * Start taking predictive actions
+ *
+ * Calling this will cause the predictor to (possibly) start
+ * taking actions such as DNS prefetch and/or TCP preconnect based on
+ * (1) the host name that we are given, and (2) the reason we are being
+ * asked to take actions.
+ *
+ * @param targetURI - The URI we are being asked to take actions based on.
+ * @param sourceURI - The URI that is currently loaded. This is so we can
+ * avoid doing predictive actions for link hover on an HTTPS page (for
+ * example).
+ * @param reason - The reason we are being asked to take actions. Can be
+ * any of the PREDICT_* values above.
+ * In the case of PREDICT_LINK, targetURI should be the URI of the link
+ * that is being hovered over, and sourceURI should be the URI of the page
+ * on which the link appears.
+ * In the case of PREDICT_LOAD, targetURI should be the URI of the page that
+ * is being loaded and sourceURI should be null.
+ * In the case of PREDICT_STARTUP, both targetURI and sourceURI should be
+ * null.
+ * @param loadContext - The nsILoadContext of the page load we are predicting
+ * about.
+ * @param verifier - An nsINetworkPredictorVerifier used in testing to ensure
+ * we're predicting the way we expect to. Not necessary (or desired) for
+ * normal operation.
+ */
+ void predict(in nsIURI targetURI,
+ in nsIURI sourceURI,
+ in PredictorPredictReason reason,
+ in nsILoadContext loadContext,
+ in nsINetworkPredictorVerifier verifier);
+
+
+ /*
+ * Reasons we are learning something
+ *
+ * LEARN_LOAD_TOPLEVEL - we are learning about the toplevel resource of a
+ * pageload (NOTE: this should ONLY be used by tests)
+ *
+ * LEARN_LOAD_SUBRESOURCE - we are learning a subresource from a pageload
+ *
+ * LEARN_LOAD_REDIRECT - we are learning about the re-direct of a URI
+ *
+ * LEARN_STARTUP - we are learning about a page loaded during startup
+ */
+ const PredictorLearnReason LEARN_LOAD_TOPLEVEL = 0;
+ const PredictorLearnReason LEARN_LOAD_SUBRESOURCE = 1;
+ const PredictorLearnReason LEARN_LOAD_REDIRECT = 2;
+ const PredictorLearnReason LEARN_STARTUP = 3;
+
+ /**
+ * Add to our compendium of knowledge
+ *
+ * This adds to our prediction database to make things (hopefully)
+ * smarter next time we predict something.
+ *
+ * @param targetURI - The URI that was loaded that we are keeping track of.
+ * @param sourceURI - The URI that caused targetURI to be loaded (for page
+ * loads). This means the DOCUMENT URI.
+ * @param reason - The reason we are learning this bit of knowledge.
+ * Reason can be any of the LEARN_* values.
+ * In the case of LEARN_LOAD_SUBRESOURCE, targetURI should be the URI of a
+ * subresource of a page, and sourceURI should be the top-level URI.
+ * In the case of LEARN_LOAD_REDIRECT, targetURI is the NEW URI of a
+ * top-level resource that was redirected to, and sourceURI is the
+ * ORIGINAL URI of said top-level resource.
+ * In the case of LEARN_STARTUP, targetURI should be the URI of a page
+ * that was loaded immediately after browser startup, and sourceURI should
+ * be null.
+ * @param loadContext - The nsILoadContext for the page load that we are
+ * learning about.
+ */
+ void learn(in nsIURI targetURI,
+ in nsIURI sourceURI,
+ in PredictorLearnReason reason,
+ in nsILoadContext loadContext);
+
+ /**
+ * Clear out all our learned knowledge
+ *
+ * This removes everything from our database so that any predictions begun
+ * after this completes will start from a blank slate.
+ */
+ void reset();
+};
+
+%{C++
+// Wrapper functions to make use of the predictor easier and less invasive
+class nsIChannel;
+class nsIDocument;
+class nsILoadContext;
+class nsILoadGroup;
+class nsINetworkPredictorVerifier;
+
+namespace mozilla {
+namespace net {
+
+nsresult PredictorPredict(nsIURI *targetURI,
+ nsIURI *sourceURI,
+ PredictorPredictReason reason,
+ nsILoadContext *loadContext,
+ nsINetworkPredictorVerifier *verifier);
+
+nsresult PredictorLearn(nsIURI *targetURI,
+ nsIURI *sourceURI,
+ PredictorLearnReason reason,
+ nsILoadContext *loadContext);
+
+nsresult PredictorLearn(nsIURI *targetURI,
+ nsIURI *sourceURI,
+ PredictorLearnReason reason,
+ nsILoadGroup *loadGroup);
+
+nsresult PredictorLearn(nsIURI *targetURI,
+ nsIURI *sourceURI,
+ PredictorLearnReason reason,
+ nsIDocument *document);
+
+nsresult PredictorLearnRedirect(nsIURI *targetURI,
+ nsIChannel *channel,
+ nsILoadContext *loadContext);
+
+} // mozilla::net
+} // mozilla
+%}