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// Copyright 2014 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 ReadableStream_h
#define ReadableStream_h
#include "bindings/core/v8/ScriptPromise.h"
#include "bindings/core/v8/ScriptPromiseProperty.h"
#include "bindings/core/v8/ScriptState.h"
#include "bindings/core/v8/ScriptValue.h"
#include "bindings/core/v8/ScriptWrappable.h"
#include "bindings/core/v8/V8Binding.h"
#include "core/CoreExport.h"
#include "platform/heap/Handle.h"
#include "wtf/Forward.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefPtr.h"
namespace blink {
class DOMException;
class ExceptionState;
class ExecutionContext;
class ReadableStreamReader;
class UnderlyingSource;
class CORE_EXPORT ReadableStream : public GarbageCollectedFinalized<ReadableStream>, public ScriptWrappable {
enum State {
// After ReadableStream construction, |didSourceStart| must be called when
// |source| initialization succeeds and |error| must be called when
// |source| initialization fails.
explicit ReadableStream(UnderlyingSource* /* source */);
virtual ~ReadableStream();
bool isStarted() const { return m_isStarted; }
bool isDraining() const { return m_isDraining; }
bool isPulling() const { return m_isPulling; }
State stateInternal() const { return m_state; }
DOMException* storedException() { return m_exception.get(); }
virtual ScriptPromise read(ScriptState*) = 0;
ScriptPromise cancel(ScriptState*);
ScriptPromise cancel(ScriptState*, ScriptValue reason);
ScriptPromise cancelInternal(ScriptState*, ScriptValue reason);
virtual bool hasPendingReads() const = 0;
virtual void resolveAllPendingReadsAsDone() = 0;
virtual void rejectAllPendingReads(DOMException*) = 0;
void close();
void error(DOMException*);
void didSourceStart();
// This function is not a getter. It creates an ReadableStreamReader and
// returns it.
ReadableStreamReader* getReader(ExecutionContext*, ExceptionState&);
// Only ReadableStreamReader methods should call this function.
void setReader(ReadableStreamReader*);
bool isLocked() const { return m_reader; }
bool isLockedTo(const ReadableStreamReader* reader) const { return m_reader == reader; }
bool enqueuePreliminaryCheck();
bool enqueuePostAction();
void readInternalPostAction();
using WaitPromise = ScriptPromiseProperty<Member<ReadableStream>, ToV8UndefinedGenerator, Member<DOMException>>;
using ClosedPromise = ScriptPromiseProperty<Member<ReadableStream>, ToV8UndefinedGenerator, Member<DOMException>>;
virtual bool isQueueEmpty() const = 0;
virtual void clearQueue() = 0;
// This function will call ReadableStream::error on error.
virtual bool shouldApplyBackpressure() = 0;
void callPullIfNeeded();
void closeInternal();
Member<UnderlyingSource> m_source;
bool m_isStarted;
bool m_isDraining;
bool m_isPulling;
State m_state;
Member<DOMException> m_exception;
Member<ReadableStreamReader> m_reader;
} // namespace blink
#endif // ReadableStream_h