1/* Copyright (c) 2017, The Linux Foundation. All rights reserved.
2 *
3 * Redistribution and use in source and binary forms, with or without
4 * modification, are permitted provided that the following conditions are
5 * met:
6 *     * Redistributions of source code must retain the above copyright
7 *       notice, this list of conditions and the following disclaimer.
8 *     * Redistributions in binary form must reproduce the above
9 *       copyright notice, this list of conditions and the following
10 *       disclaimer in the documentation and/or other materials provided
11 *       with the distribution.
12 *     * Neither the name of The Linux Foundation, nor the names of its
13 *       contributors may be used to endorse or promote products derived
14 *       from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
23 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
25 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
26 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 */
29#define LOG_TAG "DataItemsFactoryProxy"
30
31#include <dlfcn.h>
32#include <DataItemId.h>
33#include <IDataItemCore.h>
34#include <DataItemsFactoryProxy.h>
35#include <platform_lib_log_util.h>
36
37namespace loc_core
38{
39void* DataItemsFactoryProxy::dataItemLibHandle = NULL;
40get_concrete_data_item_fn* DataItemsFactoryProxy::getConcreteDIFunc = NULL;
41
42IDataItemCore* DataItemsFactoryProxy::createNewDataItem(DataItemId id)
43{
44    IDataItemCore *mydi = nullptr;
45
46    if (NULL != getConcreteDIFunc) {
47        mydi = (*getConcreteDIFunc)(id);
48    }
49    else {
50        // first call to this function, symbol not yet loaded
51        if (NULL == dataItemLibHandle) {
52            LOC_LOGD("Loaded library %s",DATA_ITEMS_LIB_NAME);
53            dataItemLibHandle = dlopen(DATA_ITEMS_LIB_NAME, RTLD_NOW);
54            if (NULL == dataItemLibHandle) {
55                // dlopen failed.
56                const char * err = dlerror();
57                if (NULL == err)
58                {
59                    err = "Unknown";
60                }
61                LOC_LOGE("%s:%d]: failed to load library %s; error=%s",
62                     __func__, __LINE__, DATA_ITEMS_LIB_NAME, err);
63            }
64        }
65
66        // load sym - if dlopen handle is obtained and symbol is not yet obtained
67        if (NULL != dataItemLibHandle) {
68            getConcreteDIFunc = (get_concrete_data_item_fn * )
69                                    dlsym(dataItemLibHandle, DATA_ITEMS_GET_CONCRETE_DI);
70            if (NULL != getConcreteDIFunc) {
71                LOC_LOGD("Loaded function %s : %x",DATA_ITEMS_GET_CONCRETE_DI,getConcreteDIFunc);
72                mydi = (*getConcreteDIFunc)(id);
73            }
74            else {
75                // dlysm failed.
76                const char * err = dlerror();
77                if (NULL == err)
78                {
79                    err = "Unknown";
80                }
81                LOC_LOGE("%s:%d]: failed to find symbol %s; error=%s",
82                         __func__, __LINE__, DATA_ITEMS_GET_CONCRETE_DI, err);
83            }
84        }
85    }
86    return mydi;
87}
88
89void DataItemsFactoryProxy::closeDataItemLibraryHandle()
90{
91    if (NULL != dataItemLibHandle) {
92        dlclose(dataItemLibHandle);
93        dataItemLibHandle = NULL;
94    }
95}
96
97} // namespace loc_core
98
99
100