Break res_stasis into smaller files.

When implementing playback for stasis-http, the monolithicedness of
res_stasis really started to get in my way.

This patch breaks the major components of res_stasis.c into individual
files.

 * res/stasis/app.c - Stasis application tracking
 * res/stasis/control.c - Channel control objects
 * res/stasis/command.c - Channel command object

This refactoring also allows res_stasis applications to be loaded as
independent modules, such as the new res_stasis_answer module.

The bulk of this patch is simply moving code from one file to another,
adjusting names and adding accessors as necessary.

Review: https://reviewboard.asterisk.org/r/2530/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@388729 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/stasis/app.h

@@ -0,0 +1,77 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2013, Digium, Inc.
+ *
+ * David M. Lee, II <dlee@digium.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+#ifndef _ASTERISK_RES_STASIS_APP_H
+#define _ASTERISK_RES_STASIS_APP_H
+
+/*! \file
+ *
+ * \brief Internal API for the Stasis application controller.
+ *
+ * \author David M. Lee, II <dlee@digium.com>
+ * \since 12
+ */
+
+#include "asterisk/channel.h"
+#include "asterisk/stasis.h"
+#include "asterisk/stasis_app.h"
+
+/*!
+ * \brief Opaque pointer to \c res_stasis app structure.
+ */
+struct app;
+
+/*!
+ * \brief Create a res_stasis application.
+ *
+ * \param name Name of the application.
+ * \param handler Callback for messages sent to the application.
+ * \param data Data pointer provided to the callback.
+ * \return New \c res_stasis application.
+ * \return \c NULL on error.
+ */
+struct app *app_create(const char *name, stasis_app_cb handler, void *data);
+
+/*!
+ * \brief Update the handler and data for a \c res_stasis application.
+ *
+ * \param app Application to update.
+ * \param handler New application callback.
+ * \param data New data pointer for the callback.
+ */
+void app_update(struct app *app, stasis_app_cb handler, void *data);
+
+const char *app_name(const struct app *app);
+
+struct stasis_subscription *app_subscribe(struct app *app,
+	struct stasis_topic *topic);
+
+void app_send(struct app *app, struct ast_json *message);
+
+int app_send_start_msg(struct app *app, struct ast_channel *chan, int argc,
+	char *argv[]);
+
+int app_send_end_msg(struct app *app, struct ast_channel *chan);
+
+int app_is_watching_channel(struct app *app, const char *uniqueid);
+
+int app_add_channel(struct app* app, const struct ast_channel *chan);
+
+void app_remove_channel(struct app *app, const struct ast_channel *chan);
+
+#endif /* _ASTERISK_RES_STASIS_APP_H */