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116 lines
4.9 KiB
C++
116 lines
4.9 KiB
C++
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef MOJO_EDK_SYSTEM_REMOTE_CONSUMER_DATA_PIPE_IMPL_H_
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#define MOJO_EDK_SYSTEM_REMOTE_CONSUMER_DATA_PIPE_IMPL_H_
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#include <memory>
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#include "mojo/edk/platform/aligned_alloc.h"
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#include "mojo/edk/system/channel_endpoint.h"
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#include "mojo/edk/system/data_pipe_impl.h"
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#include "mojo/edk/util/ref_ptr.h"
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#include "mojo/public/cpp/system/macros.h"
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namespace mojo {
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namespace system {
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// |RemoteConsumerDataPipeImpl| is a subclass that "implements" |DataPipe| for
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// data pipes whose producer is local and whose consumer is remote. See
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// |DataPipeImpl| for more details.
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class RemoteConsumerDataPipeImpl final : public DataPipeImpl {
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public:
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// |buffer| is only required if |producer_two_phase_max_num_bytes_written()|
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// is nonzero (i.e., if we're in the middle of a two-phase write when the
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// consumer handle is transferred); |start_index| is ignored if it is zero.
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RemoteConsumerDataPipeImpl(util::RefPtr<ChannelEndpoint>&& channel_endpoint,
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size_t consumer_num_bytes,
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platform::AlignedUniquePtr<char> buffer,
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size_t start_index);
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~RemoteConsumerDataPipeImpl() override;
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// Processes messages that were received and queued by an |IncomingEndpoint|.
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// |*consumer_num_bytes| should be set to the value from the
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// |SerializedDataPipeProducerDispatcher|. On success, returns true and
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// updates |*consumer_num_bytes|. On failure, returns false (it may or may not
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// modify |*consumer_num_bytes|). Always clears |*messages|.
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static bool ProcessMessagesFromIncomingEndpoint(
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const MojoCreateDataPipeOptions& validated_options,
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size_t* consumer_num_bytes,
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MessageInTransitQueue* messages);
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private:
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// |DataPipeImpl| implementation:
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// Note: None of the |Consumer...()| methods should be called, except
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// |ConsumerGetHandleSignalsState()|.
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void ProducerClose() override;
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MojoResult ProducerWriteData(UserPointer<const void> elements,
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UserPointer<uint32_t> num_bytes,
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uint32_t max_num_bytes_to_write,
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uint32_t min_num_bytes_to_write) override;
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MojoResult ProducerBeginWriteData(
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UserPointer<void*> buffer,
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UserPointer<uint32_t> buffer_num_bytes) override;
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MojoResult ProducerEndWriteData(uint32_t num_bytes_written) override;
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HandleSignalsState ProducerGetHandleSignalsState() const override;
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void ProducerStartSerialize(Channel* channel,
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size_t* max_size,
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size_t* max_platform_handles) override;
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bool ProducerEndSerialize(
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Channel* channel,
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void* destination,
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size_t* actual_size,
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std::vector<platform::ScopedPlatformHandle>* platform_handles) override;
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void ConsumerClose() override;
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MojoResult ConsumerReadData(UserPointer<void> elements,
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UserPointer<uint32_t> num_bytes,
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uint32_t max_num_bytes_to_read,
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uint32_t min_num_bytes_to_read,
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bool peek) override;
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MojoResult ConsumerDiscardData(UserPointer<uint32_t> num_bytes,
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uint32_t max_num_bytes_to_discard,
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uint32_t min_num_bytes_to_discard) override;
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MojoResult ConsumerQueryData(UserPointer<uint32_t> num_bytes) override;
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MojoResult ConsumerBeginReadData(
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UserPointer<const void*> buffer,
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UserPointer<uint32_t> buffer_num_bytes) override;
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MojoResult ConsumerEndReadData(uint32_t num_bytes_read) override;
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HandleSignalsState ConsumerGetHandleSignalsState() const override;
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void ConsumerStartSerialize(Channel* channel,
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size_t* max_size,
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size_t* max_platform_handles) override;
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bool ConsumerEndSerialize(
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Channel* channel,
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void* destination,
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size_t* actual_size,
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std::vector<platform::ScopedPlatformHandle>* platform_handles) override;
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bool OnReadMessage(unsigned port, MessageInTransit* message) override;
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void OnDetachFromChannel(unsigned port) override;
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void EnsureBuffer();
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void DestroyBuffer();
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void Disconnect();
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// Should be valid if and only if |consumer_open()| returns true.
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util::RefPtr<ChannelEndpoint> channel_endpoint_;
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// The number of bytes we've sent the consumer, but don't *know* have been
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// consumed.
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size_t consumer_num_bytes_;
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// Used for two-phase writes.
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platform::AlignedUniquePtr<char> buffer_;
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// This is nearly always zero, except when the two-phase write started on a
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// |LocalDataPipeImpl|.
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size_t start_index_;
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MOJO_DISALLOW_COPY_AND_ASSIGN(RemoteConsumerDataPipeImpl);
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};
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} // namespace system
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} // namespace mojo
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#endif // MOJO_EDK_SYSTEM_REMOTE_CONSUMER_DATA_PIPE_IMPL_H_
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