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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "network/public/cpp/web_socket_write_queue.h" | |
| 6 | |
| 7 #include "base/bind.h" | |
| 8 #include "base/logging.h" | |
| 9 | |
| 10 namespace mojo { | |
| 11 | |
| 12 struct WebSocketWriteQueue::Operation { | |
| 13 uint32_t num_bytes_; | |
| 14 base::Callback<void(const char*)> callback_; | |
| 15 | |
| 16 const char* data_; | |
| 17 // Only initialized if the initial Write fails. This saves a copy in | |
| 18 // the common case. | |
| 19 std::vector<char> data_copy_; | |
| 20 }; | |
| 21 | |
| 22 WebSocketWriteQueue::WebSocketWriteQueue(DataPipeProducerHandle handle) | |
| 23 : handle_(handle), is_busy_(false), weak_factory_(this) { | |
| 24 } | |
| 25 | |
| 26 WebSocketWriteQueue::~WebSocketWriteQueue() { | |
| 27 } | |
| 28 | |
| 29 void WebSocketWriteQueue::Write(const char* data, | |
| 30 uint32_t num_bytes, | |
| 31 base::Callback<void(const char*)> callback) { | |
| 32 Operation* op = new Operation; | |
| 33 op->num_bytes_ = num_bytes; | |
| 34 op->callback_ = callback; | |
| 35 op->data_ = data; | |
| 36 queue_.push_back(op); | |
| 37 | |
| 38 if (!is_busy_) { | |
| 39 is_busy_ = true; | |
| 40 // This call may reset |is_busy_| to false. | |
| 41 TryToWrite(); | |
| 42 } | |
| 43 | |
| 44 if (is_busy_) { | |
| 45 // If we have to wait, make a local copy of the data so we know it will | |
| 46 // live until we need it. | |
| 47 op->data_copy_.resize(num_bytes); | |
| 48 memcpy(&op->data_copy_[0], data, num_bytes); | |
| 49 op->data_ = &op->data_copy_[0]; | |
| 50 } | |
| 51 } | |
| 52 | |
| 53 void WebSocketWriteQueue::TryToWrite() { | |
| 54 DCHECK(is_busy_); | |
| 55 DCHECK(!queue_.empty()); | |
| 56 do { | |
| 57 Operation* op = queue_[0]; | |
| 58 uint32_t bytes_written = op->num_bytes_; | |
| 59 MojoResult result = WriteDataRaw( | |
| 60 handle_, op->data_, &bytes_written, MOJO_WRITE_DATA_FLAG_ALL_OR_NONE); | |
| 61 if (result == MOJO_RESULT_SHOULD_WAIT) { | |
| 62 Wait(); | |
| 63 return; | |
| 64 } | |
| 65 | |
| 66 // Ensure |op| is deleted, whether or not |this| goes away. | |
| 67 scoped_ptr<Operation> op_deleter(op); | |
| 68 queue_.weak_erase(queue_.begin()); | |
| 69 | |
| 70 // http://crbug.com/490193 This should run callback as well. May need to | |
| 71 // change the callback signature. | |
| 72 if (result != MOJO_RESULT_OK) | |
| 73 return; | |
| 74 | |
| 75 base::WeakPtr<WebSocketWriteQueue> self(weak_factory_.GetWeakPtr()); | |
| 76 | |
| 77 // This call may delete |this|. In that case, |self| will be invalidated. | |
| 78 // It may re-enter Write() too. Because |is_busy_| is true during the whole | |
| 79 // process, TryToWrite() won't be re-entered. | |
| 80 op->callback_.Run(op->data_); | |
| 81 | |
| 82 if (!self) | |
| 83 return; | |
| 84 } while (!queue_.empty()); | |
| 85 is_busy_ = false; | |
| 86 } | |
| 87 | |
| 88 void WebSocketWriteQueue::Wait() { | |
| 89 DCHECK(is_busy_); | |
| 90 handle_watcher_.Start(handle_, | |
| 91 MOJO_HANDLE_SIGNAL_WRITABLE, | |
| 92 MOJO_DEADLINE_INDEFINITE, | |
| 93 base::Bind(&WebSocketWriteQueue::OnHandleReady, | |
| 94 base::Unretained(this))); | |
| 95 } | |
| 96 | |
| 97 void WebSocketWriteQueue::OnHandleReady(MojoResult result) { | |
| 98 DCHECK(is_busy_); | |
| 99 TryToWrite(); | |
| 100 } | |
| 101 | |
| 102 } // namespace mojo | |
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Chromium Code Reviews
Issue 1396423002:
Move //mojo/services/network/public/interfaces to //mojo/services/network/interfaces. (Closed)
Base URL: https://github.com/domokit/monet.git@master