+/*
+ * Copyright (C) 2005-2007 Andre Noll <maan@systemlinux.org>
+ *
+ * Licensed under the GPL v2. For licencing details see COPYING.
+ */
+
+/** \file afs_common.h data structures common to all audio file selectors */
+
+#include <sys/select.h>
+
+
+int find_audio_files(const char *dirname, int (*f)(const char *, const char *));
+
+/**
+ * describes one supported audio file selector
+ *
+ * There is one such struct for each supported selector. During the startup
+ * part of para_server the \a init() function of the activated selector gets
+ * called which fills in all other function pointers.
+ *
+ */
+struct audio_file_selector {
+/**
+ * name name of this selector
+ */
+const char *name;
+/**
+ * the init routine of the selector
+ *
+ * It should check its command line options and do all necessary initialization
+ * like connecting to a database server.
+ *
+ * A negative return value indicates an initialization error and means that
+ * this selector should be ignored for now (it may later be activated again via
+ * the chs command).
+ *
+ * If \a init() returns success (non-negative return value), it must have
+ * initialized in all non-optional function pointers of the given selector
+ * struct. Moreover, \a cmd_list must point to a NULL-terminated array which
+ * holds the list of all commands that are supported by this selector.
+ */
+int (*init)(struct audio_file_selector *self);
+/**
+ * list of commands supported by this selector
+ */
+struct server_command *cmd_list;
+/**
+ * pointer to function returning list of at most \a num audio files to be
+ * streamed next
+ *
+ * \a get_audio_file_list() must return a pointer to a array of at most \a num
+ * char* pointers (terminated by a NULL pointer), or NULL on errors. Both the
+ * array and its contents must be dynamically allocated and are freed by the
+ * caller.
+ *
+*/
+char **(*get_audio_file_list)(unsigned int num);
+/**
+ *
+ * the update hook
+ *
+ * The \a update_audio_file pointer is optional and need not be supplied. In this
+ * case it is not neccessary to init this pointer from within init(). If
+ * \a update_audio_file is non-NULL, the function it points to gets called
+ * whenever a new audio file was successfully loaded and is going to be
+ * streamed by any of paraslash's senders. The full path of the audio file is
+ * passed \a update_audio_file().
+ *
+ */
+void (*update_audio_file)(char *audio_file);
+/**
+ *
+ * shutdown this selector and free all resources
+ *
+ * This gets called whenever the audio file selector changes. The reason for
+ * this change might be that some user sent the chs command, that para_server
+ * receives the HUP signal, or that para_server shuts down. It is assumed to
+ * succeed.
+ */
+void (*shutdown)(void);
+/**
+ *
+ * add file descriptors to fd_sets
+ *
+ * The pre_select function of the activated selector gets called just before
+ * para_server enters its main select loop. The selector may add its own file
+ * descriptors to the \a rfds or the \a wfds set.
+ *
+ * \return The highest-numbered file descriptor which was added to either of
+ * the two fd sets (or -1 if no file descriptors were added).
+ *
+ * \sa select(2)
+ */
+int (*pre_select)(fd_set *rfds, fd_set *wfds);
+/**
+ * handle the file descriptors which are ready for I/O
+ *
+ * If the pre_select hook added one ore more file descriptors to the read or write
+ * set, this is the hook to check the result and do any I/O on those descriptors
+ * which are ready for reading/writing.
+ */
+void (*post_select)(fd_set *rfds, fd_set *wfds);
+/**
+ * each selector has its private data pointer */
+void *private_data;
+};
+
+int mysql_selector_init(struct audio_file_selector*);
+int playlist_selector_init(struct audio_file_selector*);
+int random_selector_init(struct audio_file_selector*);
+
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