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Unified Diff: mojo/edk/system/channel.h

Issue 623883002: Revert "Move mojo edk into mojo/edk" (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 6 years, 2 months ago
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Index: mojo/edk/system/channel.h
diff --git a/mojo/edk/system/channel.h b/mojo/edk/system/channel.h
deleted file mode 100644
index bd66ca45630a3812d13dfd582d0b1667fd8dc87d..0000000000000000000000000000000000000000
--- a/mojo/edk/system/channel.h
+++ /dev/null
@@ -1,193 +0,0 @@
-// Copyright 2013 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 MOJO_EDK_SYSTEM_CHANNEL_H_
-#define MOJO_EDK_SYSTEM_CHANNEL_H_
-
-#include <stdint.h>
-
-#include "base/compiler_specific.h"
-#include "base/containers/hash_tables.h"
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/strings/string_piece.h"
-#include "base/synchronization/lock.h"
-#include "base/threading/thread_checker.h"
-#include "mojo/edk/embedder/scoped_platform_handle.h"
-#include "mojo/edk/system/channel_endpoint.h"
-#include "mojo/edk/system/message_in_transit.h"
-#include "mojo/edk/system/message_pipe.h"
-#include "mojo/edk/system/raw_channel.h"
-#include "mojo/edk/system/system_impl_export.h"
-#include "mojo/public/c/system/types.h"
-
-namespace mojo {
-
-namespace embedder {
-class PlatformSupport;
-}
-
-namespace system {
-
-class ChannelEndpoint;
-
-// This class is mostly thread-safe. It must be created on an I/O thread.
-// |Init()| must be called on that same thread before it becomes thread-safe (in
-// particular, before references are given to any other thread) and |Shutdown()|
-// must be called on that same thread before destruction. Its public methods are
-// otherwise thread-safe. (Many private methods are restricted to the creation
-// thread.) It may be destroyed on any thread, in the sense that the last
-// reference to it may be released on any thread, with the proviso that
-// |Shutdown()| must have been called first (so the pattern is that a "main"
-// reference is kept on its creation thread and is released after |Shutdown()|
-// is called, but other threads may have temporarily "dangling" references).
-//
-// Note the lock order (in order of allowable acquisition): |MessagePipe|,
-// |ChannelEndpoint|, |Channel|. Thus |Channel| may not call into
-// |ChannelEndpoint| with |Channel|'s lock held.
-class MOJO_SYSTEM_IMPL_EXPORT Channel
- : public base::RefCountedThreadSafe<Channel>,
- public RawChannel::Delegate {
- public:
- // The first message pipe endpoint attached will have this as its local ID.
- static const MessageInTransit::EndpointId kBootstrapEndpointId = 1;
-
- // |platform_support| (typically owned by |Core|) must remain alive until
- // after |Shutdown()| is called.
- explicit Channel(embedder::PlatformSupport* platform_support);
-
- // This must be called on the creation thread before any other methods are
- // called, and before references to this object are given to any other
- // threads. |raw_channel| should be uninitialized. Returns true on success. On
- // failure, no other methods should be called (including |Shutdown()|).
- bool Init(scoped_ptr<RawChannel> raw_channel);
-
- // This must be called on the creation thread before destruction (which can
- // happen on any thread).
- void Shutdown();
-
- // Signals that |Shutdown()| will be called soon (this may be called from any
- // thread, unlike |Shutdown()|). Warnings will be issued if, e.g., messages
- // are written after this is called; other warnings may be suppressed. (This
- // may be called multiple times, or not at all.)
- void WillShutdownSoon();
-
- // Attaches the given endpoint to this channel. This assigns it a local ID,
- // which it returns. The first endpoint attached will always have
- // |kBootstrapEndpointId| as its local ID. (For bootstrapping, this occurs on
- // both sides, so one should use |kBootstrapEndpointId| for the remote ID for
- // the first message pipe across a channel.) Returns |kInvalidEndpointId| on
- // failure.
- // TODO(vtl): This should be combined with "run", and it should take a
- // |ChannelEndpoint| instead.
- // TODO(vtl): Maybe limit the number of attached message pipes.
- MessageInTransit::EndpointId AttachEndpoint(
- scoped_refptr<ChannelEndpoint> endpoint);
-
- // Runs the message pipe with the given |local_id| (previously attached), with
- // the given |remote_id| (negotiated using some other means, e.g., over an
- // existing message pipe; see comments above for the bootstrap case). Returns
- // false on failure, in particular if no message pipe with |local_id| is
- // attached.
- bool RunMessagePipeEndpoint(MessageInTransit::EndpointId local_id,
- MessageInTransit::EndpointId remote_id);
-
- // Tells the other side of the channel to run a message pipe endpoint (which
- // must already be attached); |local_id| and |remote_id| are relative to this
- // channel (i.e., |local_id| is the other side's remote ID and |remote_id| is
- // its local ID).
- // TODO(vtl): Maybe we should just have a flag argument to
- // |RunMessagePipeEndpoint()| that tells it to do this.
- void RunRemoteMessagePipeEndpoint(MessageInTransit::EndpointId local_id,
- MessageInTransit::EndpointId remote_id);
-
- // This forwards |message| verbatim to |raw_channel_|.
- bool WriteMessage(scoped_ptr<MessageInTransit> message);
-
- // See |RawChannel::IsWriteBufferEmpty()|.
- // TODO(vtl): Maybe we shouldn't expose this, and instead have a
- // |FlushWriteBufferAndShutdown()| or something like that.
- bool IsWriteBufferEmpty();
-
- // This removes the message pipe/port's endpoint (with the given local ID and
- // given remote ID, which should be |kInvalidEndpointId| if not yet running),
- // returned by |AttachEndpoint()| from this channel. After this is called,
- // |local_id| may be reused for another message pipe.
- void DetachMessagePipeEndpoint(MessageInTransit::EndpointId local_id,
- MessageInTransit::EndpointId remote_id);
-
- // See |RawChannel::GetSerializedPlatformHandleSize()|.
- size_t GetSerializedPlatformHandleSize() const;
-
- embedder::PlatformSupport* platform_support() const {
- return platform_support_;
- }
-
- private:
- friend class base::RefCountedThreadSafe<Channel>;
- virtual ~Channel();
-
- // |RawChannel::Delegate| implementation (only called on the creation thread):
- virtual void OnReadMessage(
- const MessageInTransit::View& message_view,
- embedder::ScopedPlatformHandleVectorPtr platform_handles) override;
- virtual void OnError(Error error) override;
-
- // Helpers for |OnReadMessage| (only called on the creation thread):
- void OnReadMessageForDownstream(
- const MessageInTransit::View& message_view,
- embedder::ScopedPlatformHandleVectorPtr platform_handles);
- void OnReadMessageForChannel(
- const MessageInTransit::View& message_view,
- embedder::ScopedPlatformHandleVectorPtr platform_handles);
-
- // Handles "remove message pipe endpoint" messages.
- bool OnRemoveMessagePipeEndpoint(MessageInTransit::EndpointId local_id,
- MessageInTransit::EndpointId remote_id);
- // Handles "remove message pipe endpoint ack" messages.
- bool OnRemoveMessagePipeEndpointAck(MessageInTransit::EndpointId local_id);
-
- // Handles errors (e.g., invalid messages) from the remote side. Callable from
- // any thread.
- void HandleRemoteError(const base::StringPiece& error_message);
- // Handles internal errors/failures from the local side. Callable from any
- // thread.
- void HandleLocalError(const base::StringPiece& error_message);
-
- // Helper to send channel control messages. Returns true on success. Should be
- // called *without* |lock_| held. Callable from any thread.
- bool SendControlMessage(MessageInTransit::Subtype subtype,
- MessageInTransit::EndpointId source_id,
- MessageInTransit::EndpointId destination_id);
-
- base::ThreadChecker creation_thread_checker_;
-
- embedder::PlatformSupport* const platform_support_;
-
- // Note: |MessagePipe|s MUST NOT be used under |lock_|. I.e., |lock_| can only
- // be acquired after |MessagePipe::lock_|, never before. Thus to call into a
- // |MessagePipe|, a reference to the |MessagePipe| should be acquired from
- // |local_id_to_endpoint_map_| under |lock_| and then the lock released.
- base::Lock lock_; // Protects the members below.
-
- scoped_ptr<RawChannel> raw_channel_;
- bool is_running_;
- // Set when |WillShutdownSoon()| is called.
- bool is_shutting_down_;
-
- typedef base::hash_map<MessageInTransit::EndpointId,
- scoped_refptr<ChannelEndpoint>> IdToEndpointMap;
- IdToEndpointMap local_id_to_endpoint_map_;
- // The next local ID to try (when allocating new local IDs). Note: It should
- // be checked for existence before use.
- MessageInTransit::EndpointId next_local_id_;
-
- DISALLOW_COPY_AND_ASSIGN(Channel);
-};
-
-} // namespace system
-} // namespace mojo
-
-#endif // MOJO_EDK_SYSTEM_CHANNEL_H_
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