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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_BASE_LOAD_STATES_H__
#define NET_BASE_LOAD_STATES_H__
#include "base/string16.h"
namespace net {
// These states correspond to the lengthy periods of time that a resource load
// may be blocked and unable to make progress.
enum LoadState {
// This is the default state. It corresponds to a resource load that has
// either not yet begun or is idle waiting for the consumer to do something
// to move things along (e.g., the consumer of an URLRequest may not have
// called Read yet).
LOAD_STATE_IDLE,
// This state indicates that the URLRequest delegate has chosen to block this
// request before it was sent over the network. When in this state, the
// delegate should set a load state parameter on the URLRequest describing
// the nature of the delay (i.e. "Waiting for <description given by
// delegate>").
LOAD_STATE_WAITING_FOR_DELEGATE,
// This state corresponds to a resource load that is blocked waiting for
// access to a resource in the cache. If multiple requests are made for the
// same resource, the first request will be responsible for writing (or
// updating) the cache entry and the second request will be deferred until
// the first completes. This may be done to optimize for cache reuse.
LOAD_STATE_WAITING_FOR_CACHE,
// This state corresponds to a resource load that is blocked waiting for
// access to a resource in the AppCache.
// Note: This is a layering violation, but being the only one it's not that
// bad. TODO(rvargas): Reconsider what to do if we need to add more.
LOAD_STATE_WAITING_FOR_APPCACHE,
// This state corresponds to a resource load that is blocked waiting for a
// proxy autoconfig script to return a proxy server to use.
LOAD_STATE_RESOLVING_PROXY_FOR_URL,
// This state corresponds to a resource load that is blocked waiting for a
// proxy autoconfig script to return a proxy server to use, but that proxy
// script is busy resolving the IP address of a host.
LOAD_STATE_RESOLVING_HOST_IN_PROXY_SCRIPT,
// This state indicates that we're in the process of establishing a tunnel
// through the proxy server.
LOAD_STATE_ESTABLISHING_PROXY_TUNNEL,
// This state corresponds to a resource load that is blocked waiting for a
// host name to be resolved. This could either indicate resolution of the
// origin server corresponding to the resource or to the host name of a proxy
// server used to fetch the resource.
LOAD_STATE_RESOLVING_HOST,
// This state corresponds to a resource load that is blocked waiting for a
// TCP connection (or other network connection) to be established. HTTP
// requests that reuse a keep-alive connection skip this state.
LOAD_STATE_CONNECTING,
// This state corresponds to a resource load that is blocked waiting for the
// SSL handshake to complete.
LOAD_STATE_SSL_HANDSHAKE,
// This state corresponds to a resource load that is blocked waiting to
// completely upload a request to a server. In the case of a HTTP POST
// request, this state includes the period of time during which the message
// body is being uploaded.
LOAD_STATE_SENDING_REQUEST,
// This state corresponds to a resource load that is blocked waiting for the
// response to a network request. In the case of a HTTP transaction, this
// corresponds to the period after the request is sent and before all of the
// response headers have been received.
LOAD_STATE_WAITING_FOR_RESPONSE,
// This state corresponds to a resource load that is blocked waiting for a
// read to complete. In the case of a HTTP transaction, this corresponds to
// the period after the response headers have been received and before all of
// the response body has been downloaded. (NOTE: This state only applies for
// an URLRequest while there is an outstanding Read operation.)
LOAD_STATE_READING_RESPONSE,
};
// Some states, like LOAD_STATE_WAITING_FOR_DELEGATE, are associated with extra
// data that describes more precisely what the delegate (for example) is doing.
// This class provides an easy way to hold a load state with an extra parameter.
struct LoadStateWithParam {
LoadState state;
string16 param;
LoadStateWithParam() : state(LOAD_STATE_IDLE) {}
LoadStateWithParam(LoadState state, const string16& param)
: state(state), param(param) {}
};
} // namespace net
#endif // NET_BASE_LOAD_STATES_H__
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