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122 lines
3.8 KiB
C
122 lines
3.8 KiB
C
/* Copyright (C) 2019 Philipp "ph3-der-loewe" Schafft <lion@lion.leolix.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef _LIBIGLOO__OBJECTHANDLER_H_
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#define _LIBIGLOO__OBJECTHANDLER_H_
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/**
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* @file
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* Put a good description of this file here
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "ro.h"
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#include "interface.h"
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#include "filter.h"
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/* About thread safety:
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* This set of functions is thread safe.
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*/
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igloo_RO_FORWARD_TYPE(igloo_objecthandler_t);
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/* Interface description */
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typedef struct {
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igloo_interface_base_ifdesc_t __base;
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/* Whether the this backend is thread safe. */
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int is_thread_safe;
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/* Perform the actual handling of the object. */
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igloo_filter_result_t (*handle)(igloo_INTERFACE_BASIC_ARGS, igloo_ro_t object);
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/* Flush all data left in the handler.
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* It should also flush the backend if the backend can be flushed.
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*/
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int (*flush)(igloo_INTERFACE_BASIC_ARGS);
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/* Detach old and attach new backend if operation is possible.
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* This is always done locked. So this function must not be thread safe.
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* igloo_objecthandler_flush() is automatically called before this
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* and is also protected by the lock so that there is no race between
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* the flush and the backend update.
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*/
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int (*set_backend)(igloo_INTERFACE_BASIC_ARGS, igloo_ro_t backend);
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} igloo_objecthandler_ifdesc_t;
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/* This creates a new objecthandler from a interface description and state.
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* Parameters:
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* ifdesc
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* The interface description to use.
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* backend_object
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* A object used by the backend or igloo_RO_NULL.
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* backend_userdata
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* A userdata pointer used by the backend or NULL.
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* name, associated
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* See igloo_ro_new().
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*/
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igloo_objecthandler_t * igloo_objecthandler_new(const igloo_objecthandler_ifdesc_t *ifdesc, igloo_ro_t backend_object, void *backend_userdata, const char *name, igloo_ro_t associated, igloo_ro_t instance);
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/* This handles a object according to the filter.
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* Parameters:
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* handler
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* The handler to use.
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* object
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* The object to test.
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* Returns:
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* Whether the object was accepted by the handler or not.
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*/
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igloo_filter_result_t igloo_objecthandler_handle(igloo_objecthandler_t *handler, igloo_ro_t object);
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/* Flushes the object handler. All data still in queue will be
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* written to the backend.
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* Parameters:
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* handler
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* The handler to use.
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*/
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int igloo_objecthandler_flush(igloo_objecthandler_t *handler);
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/* Detaches the old and attaches a new backend.
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* This is useful for e.g. reopening files.
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*
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* This also calls igloo_objecthandler_flush().
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*
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* Parameters:
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* handler
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* The handler to use.
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* backend
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* The new backend to use.
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*/
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int igloo_objecthandler_set_backend(igloo_objecthandler_t *handler, igloo_ro_t backend);
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/* This adds a filter to the handler.
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* Parameters:
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* handler
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* The handler to add the filter to.
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* filter
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* The filter to add.
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*/
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int igloo_objecthandler_push_filter(igloo_objecthandler_t *handler, igloo_filter_t *filter);
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#ifdef __cplusplus
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}
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#endif
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#endif /* ! _LIBIGLOO__OBJECTHANDLER_H_ */
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