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Diffstat (limited to 'src/third_party/wiredtiger/examples/c/ex_extending.c')
| -rw-r--r-- | src/third_party/wiredtiger/examples/c/ex_extending.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/src/third_party/wiredtiger/examples/c/ex_extending.c b/src/third_party/wiredtiger/examples/c/ex_extending.c new file mode 100644 index 00000000000..4d265ae1d2b --- /dev/null +++ b/src/third_party/wiredtiger/examples/c/ex_extending.c @@ -0,0 +1,133 @@ +/*- + * Public Domain 2014-2016 MongoDB, Inc. + * Public Domain 2008-2014 WiredTiger, Inc. + * + * This is free and unencumbered software released into the public domain. + * + * Anyone is free to copy, modify, publish, use, compile, sell, or + * distribute this software, either in source code form or as a compiled + * binary, for any purpose, commercial or non-commercial, and by any + * means. + * + * In jurisdictions that recognize copyright laws, the author or authors + * of this software dedicate any and all copyright interest in the + * software to the public domain. We make this dedication for the benefit + * of the public at large and to the detriment of our heirs and + * successors. We intend this dedication to be an overt act of + * relinquishment in perpetuity of all present and future rights to this + * software under copyright law. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * ex_extending.c + * This is an example demonstrating ways to extend WiredTiger with + * extractors, collators and loadable modules. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include <wiredtiger.h> + +#ifdef _WIN32 +#define strcasecmp stricmp +#endif + +static const char *home; + +/*! [case insensitive comparator] */ +/* A simple case insensitive comparator. */ +static int +__compare_nocase(WT_COLLATOR *collator, WT_SESSION *session, + const WT_ITEM *v1, const WT_ITEM *v2, int *cmp) +{ + const char *s1 = (const char *)v1->data; + const char *s2 = (const char *)v2->data; + + (void)session; /* unused */ + (void)collator; /* unused */ + + *cmp = strcasecmp(s1, s2); + return (0); +} + +static WT_COLLATOR nocasecoll = { __compare_nocase, NULL, NULL }; +/*! [case insensitive comparator] */ + +/*! [n character comparator] */ +/* + * Comparator that only compares the first N prefix characters of the string. + * This has associated data, so we need to extend WT_COLLATOR. + */ +typedef struct { + WT_COLLATOR iface; + uint32_t maxlen; +} PREFIX_COLLATOR; + +static int +__compare_prefixes(WT_COLLATOR *collator, WT_SESSION *session, + const WT_ITEM *v1, const WT_ITEM *v2, int *cmp) +{ + PREFIX_COLLATOR *pcoll = (PREFIX_COLLATOR *)collator; + const char *s1 = (const char *)v1->data; + const char *s2 = (const char *)v2->data; + + (void)session; /* unused */ + + *cmp = strncmp(s1, s2, pcoll->maxlen); + return (0); +} + +static PREFIX_COLLATOR pcoll10 = { {__compare_prefixes, NULL, NULL}, 10 }; +/*! [n character comparator] */ + +int +main(void) +{ + int ret; + WT_CONNECTION *conn; + WT_SESSION *session; + + /* + * Create a clean test directory for this run of the test program if the + * environment variable isn't already set (as is done by make check). + */ + if (getenv("WIREDTIGER_HOME") == NULL) { + home = "WT_HOME"; + ret = system("rm -rf WT_HOME && mkdir WT_HOME"); + } else + home = NULL; + + /* Open a connection to the database, creating it if necessary. */ + if ((ret = wiredtiger_open(home, NULL, "create", &conn)) != 0) + fprintf(stderr, "Error connecting to %s: %s\n", + home, wiredtiger_strerror(ret)); + + /*! [add collator nocase] */ + ret = conn->add_collator(conn, "nocase", &nocasecoll, NULL); + /*! [add collator nocase] */ + /*! [add collator prefix10] */ + ret = conn->add_collator(conn, "prefix10", &pcoll10.iface, NULL); + + /* Open a session for the current thread's work. */ + if ((ret = conn->open_session(conn, NULL, NULL, &session)) != 0) + fprintf(stderr, "Error opening a session on %s: %s\n", + home, wiredtiger_strerror(ret)); + + /* XXX Do some work... */ + + /* Note: closing the connection implicitly closes open session(s). */ + if ((ret = conn->close(conn, NULL)) != 0) + /*! [add collator prefix10] */ + fprintf(stderr, "Error closing %s: %s\n", + home, wiredtiger_strerror(ret)); + + return (ret); +} |