1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
/*
* Copyright (C) 2008 Apple Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#pragma once
#include "EventTarget.h"
#include "ExceptionOr.h"
#include "MessagePortChannel.h"
namespace JSC {
class ExecState;
class JSObject;
class JSValue;
}
namespace WebCore {
class Frame;
class MessagePort final : public RefCounted<MessagePort>, public EventTargetWithInlineData {
public:
static Ref<MessagePort> create(ScriptExecutionContext& scriptExecutionContext) { return adoptRef(*new MessagePort(scriptExecutionContext)); }
virtual ~MessagePort();
ExceptionOr<void> postMessage(JSC::ExecState&, JSC::JSValue message, Vector<JSC::Strong<JSC::JSObject>>&&);
void start();
void close();
void entangle(std::unique_ptr<MessagePortChannel>&&);
// Returns nullptr if the passed-in vector is empty.
static ExceptionOr<std::unique_ptr<MessagePortChannelArray>> disentanglePorts(Vector<RefPtr<MessagePort>>&&);
static Vector<RefPtr<MessagePort>> entanglePorts(ScriptExecutionContext&, std::unique_ptr<MessagePortChannelArray>&&);
void messageAvailable();
bool started() const { return m_started; }
void contextDestroyed();
ScriptExecutionContext* scriptExecutionContext() const final { return m_scriptExecutionContext; }
void dispatchMessages();
bool hasPendingActivity();
// Returns null if there is no entangled port, or if the entangled port is run by a different thread.
// This is used solely to enable a GC optimization. Some platforms may not be able to determine ownership
// of the remote port (since it may live cross-process) - those platforms may always return null.
MessagePort* locallyEntangledPort();
using RefCounted::ref;
using RefCounted::deref;
private:
explicit MessagePort(ScriptExecutionContext&);
void refEventTarget() final { ref(); }
void derefEventTarget() final { deref(); }
bool isMessagePort() const final { return true; }
EventTargetInterface eventTargetInterface() const final { return MessagePortEventTargetInterfaceType; }
bool addEventListener(const AtomicString& eventType, Ref<EventListener>&&, const AddEventListenerOptions&) final;
std::unique_ptr<MessagePortChannel> disentangle();
// A port starts out its life entangled, and remains entangled until it is closed or is cloned.
bool isEntangled() const { return !m_closed && !isNeutered(); }
// A port gets neutered when it is transferred to a new owner via postMessage().
bool isNeutered() const { return !m_entangledChannel; }
std::unique_ptr<MessagePortChannel> m_entangledChannel;
bool m_started { false };
bool m_closed { false };
ScriptExecutionContext* m_scriptExecutionContext;
};
} // namespace WebCore
|
