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Side by Side Diff: net/spdy/core/write_scheduler.h

Issue 2839373002: Implement SPDY_EXPORT and SPDY_EXPORT_PRIVATE macros. (Closed)
Patch Set: Rebase: manually resolve trivial merge conflicts. Created 3 years, 7 months ago
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1 // Copyright (c) 2016 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2016 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef NET_SPDY_CORE_WRITE_SCHEDULER_H_ 5 #ifndef NET_SPDY_CORE_WRITE_SCHEDULER_H_
6 #define NET_SPDY_CORE_WRITE_SCHEDULER_H_ 6 #define NET_SPDY_CORE_WRITE_SCHEDULER_H_
7 7
8 #include <tuple> 8 #include <tuple>
9 #include <vector> 9 #include <vector>
10 10
11 #include "net/base/net_export.h"
12 #include "net/spdy/core/spdy_protocol.h" 11 #include "net/spdy/core/spdy_protocol.h"
12 #include "net/spdy/platform/api/spdy_export.h"
13 13
14 namespace net { 14 namespace net {
15 15
16 // Abstract superclass for classes that decide which SPDY or HTTP/2 stream to 16 // Abstract superclass for classes that decide which SPDY or HTTP/2 stream to
17 // write next. Concrete subclasses implement various scheduling policies: 17 // write next. Concrete subclasses implement various scheduling policies:
18 // 18 //
19 // PriorityWriteScheduler: implements SPDY priority-based stream scheduling, 19 // PriorityWriteScheduler: implements SPDY priority-based stream scheduling,
20 // where (writable) higher-priority streams are always given precedence 20 // where (writable) higher-priority streams are always given precedence
21 // over lower-priority streams. 21 // over lower-priority streams.
22 // 22 //
23 // Http2PriorityWriteScheduler: implements SPDY priority-based stream 23 // Http2PriorityWriteScheduler: implements SPDY priority-based stream
24 // scheduling coupled with the HTTP/2 stream dependency model. This is only 24 // scheduling coupled with the HTTP/2 stream dependency model. This is only
25 // intended as a transitional step towards Http2WeightedWriteScheduler. 25 // intended as a transitional step towards Http2WeightedWriteScheduler.
26 // 26 //
27 // Http2WeightedWriteScheduler (coming soon): implements the HTTP/2 stream 27 // Http2WeightedWriteScheduler (coming soon): implements the HTTP/2 stream
28 // dependency model with weighted stream scheduling, fully conforming to 28 // dependency model with weighted stream scheduling, fully conforming to
29 // RFC 7540. 29 // RFC 7540.
30 // 30 //
31 // The type used to represent stream IDs (StreamIdType) is templated in order 31 // The type used to represent stream IDs (StreamIdType) is templated in order
32 // to allow for use by both SPDY and QUIC codebases. It must be a POD that 32 // to allow for use by both SPDY and QUIC codebases. It must be a POD that
33 // supports comparison (i.e., a numeric type). 33 // supports comparison (i.e., a numeric type).
34 // 34 //
35 // Each stream can be in one of two states: ready or not ready (for writing). 35 // Each stream can be in one of two states: ready or not ready (for writing).
36 // Ready state is changed by calling the MarkStreamReady() and 36 // Ready state is changed by calling the MarkStreamReady() and
37 // MarkStreamNotReady() methods. Only streams in the ready state can be 37 // MarkStreamNotReady() methods. Only streams in the ready state can be
38 // returned by PopNextReadyStream(); when returned by that method, the stream's 38 // returned by PopNextReadyStream(); when returned by that method, the stream's
39 // state changes to not ready. 39 // state changes to not ready.
40 template <typename StreamIdType> 40 template <typename StreamIdType>
41 class NET_EXPORT_PRIVATE WriteScheduler { 41 class SPDY_EXPORT_PRIVATE WriteScheduler {
42 public: 42 public:
43 typedef StreamPrecedence<StreamIdType> StreamPrecedenceType; 43 typedef StreamPrecedence<StreamIdType> StreamPrecedenceType;
44 44
45 virtual ~WriteScheduler() {} 45 virtual ~WriteScheduler() {}
46 46
47 // Registers new stream |stream_id| with the scheduler, assigning it the 47 // Registers new stream |stream_id| with the scheduler, assigning it the
48 // given precedence. If the scheduler supports stream dependencies, the 48 // given precedence. If the scheduler supports stream dependencies, the
49 // stream is inserted into the dependency tree under 49 // stream is inserted into the dependency tree under
50 // |precedence.parent_id()|. 50 // |precedence.parent_id()|.
51 // 51 //
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142 // Returns true iff the scheduler has any ready streams. 142 // Returns true iff the scheduler has any ready streams.
143 virtual bool HasReadyStreams() const = 0; 143 virtual bool HasReadyStreams() const = 0;
144 144
145 // Returns the number of streams currently marked ready. 145 // Returns the number of streams currently marked ready.
146 virtual size_t NumReadyStreams() const = 0; 146 virtual size_t NumReadyStreams() const = 0;
147 }; 147 };
148 148
149 } // namespace net 149 } // namespace net
150 150
151 #endif // NET_SPDY_CORE_WRITE_SCHEDULER_H_ 151 #endif // NET_SPDY_CORE_WRITE_SCHEDULER_H_
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