1230557Sjimharris/*- 2230557Sjimharris * This file is provided under a dual BSD/GPLv2 license. When using or 3230557Sjimharris * redistributing this file, you may do so under either license. 4230557Sjimharris * 5230557Sjimharris * GPL LICENSE SUMMARY 6230557Sjimharris * 7230557Sjimharris * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved. 8230557Sjimharris * 9230557Sjimharris * This program is free software; you can redistribute it and/or modify 10230557Sjimharris * it under the terms of version 2 of the GNU General Public License as 11230557Sjimharris * published by the Free Software Foundation. 12230557Sjimharris * 13230557Sjimharris * This program is distributed in the hope that it will be useful, but 14230557Sjimharris * WITHOUT ANY WARRANTY; without even the implied warranty of 15230557Sjimharris * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16230557Sjimharris * General Public License for more details. 17230557Sjimharris * 18230557Sjimharris * You should have received a copy of the GNU General Public License 19230557Sjimharris * along with this program; if not, write to the Free Software 20230557Sjimharris * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 21230557Sjimharris * The full GNU General Public License is included in this distribution 22230557Sjimharris * in the file called LICENSE.GPL. 23230557Sjimharris * 24230557Sjimharris * BSD LICENSE 25230557Sjimharris * 26230557Sjimharris * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved. 27230557Sjimharris * All rights reserved. 28230557Sjimharris * 29230557Sjimharris * Redistribution and use in source and binary forms, with or without 30230557Sjimharris * modification, are permitted provided that the following conditions 31230557Sjimharris * are met: 32230557Sjimharris * 33230557Sjimharris * * Redistributions of source code must retain the above copyright 34230557Sjimharris * notice, this list of conditions and the following disclaimer. 35230557Sjimharris * * Redistributions in binary form must reproduce the above copyright 36230557Sjimharris * notice, this list of conditions and the following disclaimer in 37230557Sjimharris * the documentation and/or other materials provided with the 38230557Sjimharris * distribution. 39230557Sjimharris * 40230557Sjimharris * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 41230557Sjimharris * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 42230557Sjimharris * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 43230557Sjimharris * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 44230557Sjimharris * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45230557Sjimharris * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 46230557Sjimharris * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 47230557Sjimharris * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 48230557Sjimharris * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 49230557Sjimharris * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 50230557Sjimharris * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 51230557Sjimharris */ 52230557Sjimharris 53230557Sjimharris#include <sys/cdefs.h> 54230557Sjimharris__FBSDID("$FreeBSD: releng/10.2/sys/dev/isci/scil/sci_base_subject.c 231136 2012-02-07 17:43:58Z jimharris $"); 55230557Sjimharris 56230557Sjimharris/** 57230557Sjimharris * @file 58230557Sjimharris * 59230557Sjimharris * @brief This file contains the base subject method implementations and 60230557Sjimharris * any constants or structures private to the base subject object. 61230557Sjimharris * A subject is a participant in the observer design pattern. A 62230557Sjimharris * subject represents the object being observed. 63230557Sjimharris */ 64230557Sjimharris 65230557Sjimharris#include <dev/isci/scil/sci_types.h> 66230557Sjimharris#include <dev/isci/scil/sci_base_subject.h> 67230557Sjimharris#include <dev/isci/scil/sci_base_observer.h> 68230557Sjimharris 69230557Sjimharris#if defined(SCI_LOGGING) 70230557Sjimharris 71230557Sjimharris//****************************************************************************** 72230557Sjimharris//* P R O T E C T E D M E T H O D S 73230557Sjimharris//****************************************************************************** 74230557Sjimharris 75230557Sjimharrisvoid sci_base_subject_construct( 76230557Sjimharris SCI_BASE_SUBJECT_T *this_subject 77230557Sjimharris) 78230557Sjimharris{ 79230557Sjimharris this_subject->observer_list = NULL; 80230557Sjimharris} 81230557Sjimharris 82230557Sjimharris// --------------------------------------------------------------------------- 83230557Sjimharris 84230557Sjimharrisvoid sci_base_subject_notify( 85230557Sjimharris SCI_BASE_SUBJECT_T *this_subject 86230557Sjimharris) 87230557Sjimharris{ 88230557Sjimharris SCI_BASE_OBSERVER_T *this_observer = this_subject->observer_list; 89230557Sjimharris 90230557Sjimharris while (this_observer != NULL) 91230557Sjimharris { 92230557Sjimharris sci_base_observer_update(this_observer, this_subject); 93230557Sjimharris 94230557Sjimharris this_observer = this_observer->next; 95230557Sjimharris } 96230557Sjimharris} 97230557Sjimharris 98230557Sjimharris// --------------------------------------------------------------------------- 99230557Sjimharris 100230557Sjimharrisvoid sci_base_subject_attach_observer( 101230557Sjimharris SCI_BASE_SUBJECT_T *this_subject, 102230557Sjimharris SCI_BASE_OBSERVER_T *observer 103230557Sjimharris) 104230557Sjimharris{ 105230557Sjimharris observer->next = this_subject->observer_list; 106230557Sjimharris 107230557Sjimharris this_subject->observer_list = observer; 108230557Sjimharris} 109230557Sjimharris 110230557Sjimharris// --------------------------------------------------------------------------- 111230557Sjimharris 112230557Sjimharrisvoid sci_base_subject_detach_observer( 113230557Sjimharris SCI_BASE_SUBJECT_T *this_subject, 114230557Sjimharris SCI_BASE_OBSERVER_T *observer 115230557Sjimharris) 116230557Sjimharris{ 117230557Sjimharris SCI_BASE_OBSERVER_T *current_observer = this_subject->observer_list; 118230557Sjimharris SCI_BASE_OBSERVER_T *previous_observer = NULL; 119230557Sjimharris 120230557Sjimharris // Search list for the item to remove 121230557Sjimharris while ( 122230557Sjimharris current_observer != NULL 123230557Sjimharris && current_observer != observer 124230557Sjimharris ) 125230557Sjimharris { 126230557Sjimharris previous_observer = current_observer; 127230557Sjimharris current_observer = current_observer->next; 128230557Sjimharris } 129230557Sjimharris 130230557Sjimharris // Was this observer in the list? 131230557Sjimharris if (current_observer == observer) 132230557Sjimharris { 133230557Sjimharris if (previous_observer != NULL) 134230557Sjimharris { 135230557Sjimharris // Remove from middle or end of list 136230557Sjimharris previous_observer->next = observer->next; 137230557Sjimharris } 138230557Sjimharris else 139230557Sjimharris { 140230557Sjimharris // Remove from the front of the list 141230557Sjimharris this_subject->observer_list = observer->next; 142230557Sjimharris } 143230557Sjimharris 144230557Sjimharris // protect the list so people dont follow bad pointers 145230557Sjimharris observer->next = NULL; 146230557Sjimharris } 147230557Sjimharris} 148230557Sjimharris 149230557Sjimharris#endif // defined(SCI_LOGGING) 150