1 // Copyright 2012 The Chromium Authors 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef NET_BASE_REQUEST_PRIORITY_H_ 6 #define NET_BASE_REQUEST_PRIORITY_H_ 7 8 #include "net/base/net_export.h" 9 10 namespace net { 11 12 // Prioritization used in various parts of the networking code such 13 // as connection prioritization and resource loading prioritization. 14 // A Java counterpart will be generated for this enum. 15 // GENERATED_JAVA_ENUM_PACKAGE: org.chromium.net 16 // GENERATED_JAVA_CLASS_NAME_OVERRIDE: RequestPriority 17 // 18 // This enum should be synchronized with the enum NetRequestPriority in 19 // tools/metrics/histograms/enums.xml. 20 enum RequestPriority { 21 THROTTLED = 0, // Used to signal that resources 22 // should be reserved for following 23 // requests (i.e. that higher priority 24 // following requests are expected). 25 MINIMUM_PRIORITY = THROTTLED, 26 IDLE = 1, // Default "as resources available" level. 27 LOWEST = 2, 28 DEFAULT_PRIORITY = LOWEST, 29 LOW = 3, 30 MEDIUM = 4, 31 HIGHEST = 5, 32 MAXIMUM_PRIORITY = HIGHEST, 33 }; 34 35 // For simplicity, one can assume that one can index into array of 36 // NUM_PRIORITIES elements with a RequestPriority (i.e., 37 // MINIMUM_PRIORITY == 0). 38 enum RequestPrioritySize { 39 NUM_PRIORITIES = MAXIMUM_PRIORITY + 1, 40 }; 41 42 // Default value to use for the incremental loading flag as part of HTTP 43 // extensible priorities (RFC 9218). Currently used for HTTP/3. 44 // 45 // This default is the value that works best in most cases that the networking 46 // code supports (simultaneous requests are loaded concurrently and don't block 47 // one another). 48 // 49 // This is independent from the spec default for the protocol, which is false. 50 const bool kDefaultPriorityIncremental = true; 51 52 NET_EXPORT const char* RequestPriorityToString(RequestPriority priority); 53 54 } // namespace net 55 56 #endif // NET_BASE_REQUEST_PRIORITY_H_ 57