1 | /* |
2 | * Copyright (C) 2016 Canon Inc. |
3 | * |
4 | * Redistribution and use in source and binary forms, with or without |
5 | * modification, are permitted, provided that the following conditions |
6 | * are required to be met: |
7 | * |
8 | * 1. Redistributions of source code must retain the above copyright |
9 | * notice, this list of conditions and the following disclaimer. |
10 | * 2. Redistributions in binary form must reproduce the above copyright |
11 | * notice, this list of conditions and the following disclaimer in the |
12 | * documentation and/or other materials provided with the distribution. |
13 | * 3. Neither the name of Canon Inc. nor the names of |
14 | * its contributors may be used to endorse or promote products derived |
15 | * from this software without specific prior written permission. |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY CANON INC. AND ITS CONTRIBUTORS "AS IS" AND ANY |
18 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
19 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
20 | * DISCLAIMED. IN NO EVENT SHALL CANON INC. AND ITS CONTRIBUTORS BE LIABLE FOR |
21 | * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
23 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
24 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
25 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
26 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
28 | |
29 | #pragma once |
30 | |
31 | #if ENABLE(STREAMS_API) |
32 | |
33 | #include "JSDOMPromiseDeferred.h" |
34 | #include "ReadableStreamDefaultController.h" |
35 | #include <wtf/Optional.h> |
36 | |
37 | namespace WebCore { |
38 | |
39 | class ReadableStreamSource : public RefCounted<ReadableStreamSource> { |
40 | public: |
41 | virtual ~ReadableStreamSource() = default; |
42 | |
43 | void start(ReadableStreamDefaultController&&, DOMPromiseDeferred<void>&&); |
44 | void pull(DOMPromiseDeferred<void>&&); |
45 | void cancel(JSC::JSValue); |
46 | |
47 | bool isPulling() const { return !!m_promise; } |
48 | |
49 | protected: |
50 | ReadableStreamDefaultController& controller() { return m_controller.value(); } |
51 | const ReadableStreamDefaultController& controller() const { return m_controller.value(); } |
52 | |
53 | void startFinished(); |
54 | void pullFinished(); |
55 | void cancelFinished(); |
56 | void clean(); |
57 | |
58 | virtual void setActive() = 0; |
59 | virtual void setInactive() = 0; |
60 | |
61 | virtual void doStart() = 0; |
62 | virtual void doPull() = 0; |
63 | virtual void doCancel() = 0; |
64 | |
65 | private: |
66 | Optional<DOMPromiseDeferred<void>> m_promise; |
67 | Optional<ReadableStreamDefaultController> m_controller; |
68 | }; |
69 | |
70 | inline void ReadableStreamSource::start(ReadableStreamDefaultController&& controller, DOMPromiseDeferred<void>&& promise) |
71 | { |
72 | ASSERT(!m_promise); |
73 | m_promise = WTFMove(promise); |
74 | m_controller = WTFMove(controller); |
75 | |
76 | setActive(); |
77 | doStart(); |
78 | } |
79 | |
80 | inline void ReadableStreamSource::pull(DOMPromiseDeferred<void>&& promise) |
81 | { |
82 | ASSERT(!m_promise); |
83 | ASSERT(m_controller); |
84 | |
85 | m_promise = WTFMove(promise); |
86 | |
87 | setActive(); |
88 | doPull(); |
89 | } |
90 | |
91 | inline void ReadableStreamSource::startFinished() |
92 | { |
93 | ASSERT(m_promise); |
94 | std::exchange(m_promise, WTF::nullopt).value().resolve(); |
95 | setInactive(); |
96 | } |
97 | |
98 | inline void ReadableStreamSource::pullFinished() |
99 | { |
100 | ASSERT(m_promise); |
101 | std::exchange(m_promise, WTF::nullopt).value().resolve(); |
102 | setInactive(); |
103 | } |
104 | |
105 | inline void ReadableStreamSource::cancel(JSC::JSValue) |
106 | { |
107 | clean(); |
108 | doCancel(); |
109 | } |
110 | |
111 | inline void ReadableStreamSource::clean() |
112 | { |
113 | if (m_promise) { |
114 | m_promise = WTF::nullopt; |
115 | setInactive(); |
116 | } |
117 | } |
118 | |
119 | } // namespace WebCore |
120 | |
121 | #endif // ENABLE(STREAMS_API) |
122 | |