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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.
define("mojo/public/js/connector", [
"mojo/public/js/buffer",
"mojo/public/js/codec",
"mojo/public/js/core",
"mojo/public/js/support",
], function(buffer, codec, core, support) {
function Connector(handle) {
if (!core.isHandle(handle))
throw new Error("Connector: not a handle " + handle);
this.handle_ = handle;
this.dropWrites_ = false;
this.error_ = false;
this.incomingReceiver_ = null;
this.readWaitCookie_ = null;
this.errorHandler_ = null;
this.waitToReadMore_();
}
Connector.prototype.close = function() {
if (this.readWaitCookie_) {
support.cancelWait(this.readWaitCookie_);
this.readWaitCookie_ = null;
}
if (this.handle_ != null) {
core.close(this.handle_);
this.handle_ = null;
}
};
Connector.prototype.accept = function(message) {
if (this.error_)
return false;
if (this.dropWrites_)
return true;
var result = core.writeMessage(this.handle_,
new Uint8Array(message.buffer.arrayBuffer),
message.handles,
core.WRITE_MESSAGE_FLAG_NONE);
switch (result) {
case core.RESULT_OK:
// The handles were successfully transferred, so we don't own them
// anymore.
message.handles = [];
break;
case core.RESULT_FAILED_PRECONDITION:
// There's no point in continuing to write to this pipe since the other
// end is gone. Avoid writing any future messages. Hide write failures
// from the caller since we'd like them to continue consuming any
// backlog of incoming messages before regarding the message pipe as
// closed.
this.dropWrites_ = true;
break;
default:
// This particular write was rejected, presumably because of bad input.
// The pipe is not necessarily in a bad state.
return false;
}
return true;
};
Connector.prototype.setIncomingReceiver = function(receiver) {
this.incomingReceiver_ = receiver;
};
Connector.prototype.setErrorHandler = function(handler) {
this.errorHandler_ = handler;
};
Connector.prototype.encounteredError = function() {
return this.error_;
};
Connector.prototype.waitToReadMore_ = function() {
this.readWaitCookie_ = support.asyncWait(this.handle_,
core.HANDLE_SIGNAL_READABLE,
this.readMore_.bind(this));
};
Connector.prototype.readMore_ = function(result) {
for (;;) {
var read = core.readMessage(this.handle_,
core.READ_MESSAGE_FLAG_NONE);
if (this.handle_ == null) // The connector has been closed.
return;
if (read.result == core.RESULT_SHOULD_WAIT) {
this.waitToReadMore_();
return;
}
if (read.result != core.RESULT_OK) {
this.error_ = true;
if (this.errorHandler_)
this.errorHandler_.onError(read.result);
return;
}
var messageBuffer = new buffer.Buffer(read.buffer);
var message = new codec.Message(messageBuffer, read.handles);
if (this.incomingReceiver_) {
this.incomingReceiver_.accept(message);
}
}
};
// The TestConnector subclass is only intended to be used in unit tests. It
// enables delivering a message to the pipe's handle without an async wait.
function TestConnector(handle) {
Connector.call(this, handle);
}
TestConnector.prototype = Object.create(Connector.prototype);
TestConnector.prototype.waitToReadMore_ = function() {
};
TestConnector.prototype.deliverMessage = function() {
this.readMore_(core.RESULT_OK);
}
var exports = {};
exports.Connector = Connector;
exports.TestConnector = TestConnector;
return exports;
});
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