Web MIDI: implement MIDIAccessPromise

Source/modules/webmidi/MIDIAccessFuture.cpp

+/*
+ * Copyright (C) 2013 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "modules/webmidi/MIDIAccessFuture.h"
+
+#include "core/dom/DOMError.h"
+#include "modules/webmidi/MIDIAccess.h"
+#include "modules/webmidi/MIDIErrorCallback.h"
+#include "modules/webmidi/MIDISuccessCallback.h"
+
+namespace WebCore {
+
+PassRefPtr<MIDIAccessFuture> MIDIAccessFuture::create(ScriptExecutionContext* context)
+{
+    return adoptRef(new MIDIAccessFuture(context));
+}
+
+MIDIAccessFuture::MIDIAccessFuture(ScriptExecutionContext* context)
+    : m_context(context)
+    , m_state(Pending)
+{
+    ScriptWrappable::init(this);
+}
+
+void MIDIAccessFuture::done(PassRefPtr<MIDISuccessCallback> successCallback, PassRefPtr<MIDIErrorCallback> errorCallback)
+{
+    switch (m_state) {
+    case Accepted:
+        successCallback->scheduleCallback(m_context);
+        m_state = Invoked;
+        break;
+    case Rejected:
+        successCallback->scheduleCallback(m_context);

[Chris Rogers, 2013/06/04 04:28:58]

shouldn't this be errorCallback?

[Takashi Toyoshima, 2013/06/04 11:44:37]

Done.

+        m_state = Invoked;
+        break;
+    case Pending:
+        m_successCallback = successCallback;
+        m_errorCallback = errorCallback;
+        break;
+    case Invoked:
+        break;
+    default:
+        ASSERT_NOT_REACHED();
+    }
+}
+
+void MIDIAccessFuture::accept(MIDIOptions* options)
+{
+    if (m_state != Pending || !m_successCallback)

[dglazkov, 2013/06/04 08:08:03]

Should you clear error callback before returning?

[Takashi Toyoshima, 2013/06/04 11:44:37]

Thank you.
I reconstruct this function to meet this and the next comment.

+        return;
+    m_state = Invoked;
+    m_successCallback->handleEvent(MIDIAccess::create(m_context).leakRef(), options->sysexEnabled);
+    m_successCallback.clear();
+    if (m_errorCallback)

[dglazkov, 2013/06/04 08:08:03]

Don't need this check, right?

[Takashi Toyoshima, 2013/06/04 11:44:37]

Done.

+        m_errorCallback.clear();
+}
+
+void MIDIAccessFuture::reject(DOMError* error)
+{
+    if (m_state != Pending || !m_errorCallback)

[dglazkov, 2013/06/04 08:08:03]

Should you clear success callback before returning?

[Takashi Toyoshima, 2013/06/04 11:44:37]

Done.

+        return;
+    m_state = Invoked;
+    m_errorCallback->handleEvent(error);
+    m_errorCallback.clear();
+    if (m_successCallback)

[dglazkov, 2013/06/04 08:08:03]

Ditto.

[Takashi Toyoshima, 2013/06/04 11:44:37]

Done.

+        m_successCallback.clear();
+}
+
+} // namespace WebCore