137 lines
4.0 KiB
C
137 lines
4.0 KiB
C
/*-
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* Public Domain 2014-2016 MongoDB, Inc.
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* Public Domain 2008-2014 WiredTiger, Inc.
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*
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* This is free and unencumbered software released into the public domain.
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*
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* Anyone is free to copy, modify, publish, use, compile, sell, or
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* distribute this software, either in source code form or as a compiled
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* binary, for any purpose, commercial or non-commercial, and by any
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* means.
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*
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* In jurisdictions that recognize copyright laws, the author or authors
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* of this software dedicate any and all copyright interest in the
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* software to the public domain. We make this dedication for the benefit
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* of the public at large and to the detriment of our heirs and
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* successors. We intend this dedication to be an overt act of
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* relinquishment in perpetuity of all present and future rights to this
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* software under copyright law.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* ex_event_handler.c
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* Demonstrate how to use the WiredTiger event handler mechanism.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <wiredtiger.h>
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static const char *home;
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int handle_wiredtiger_error(
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WT_EVENT_HANDLER *, WT_SESSION *, int, const char *);
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int handle_wiredtiger_message(WT_EVENT_HANDLER *, WT_SESSION *, const char *);
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/*! [Function event_handler] */
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/*
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* Create our own event handler structure to allow us to pass context through
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* to event handler callbacks. For this to work the WiredTiger event handler
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* must appear first in our custom event handler structure.
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*/
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typedef struct {
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WT_EVENT_HANDLER h;
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const char *app_id;
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} CUSTOM_EVENT_HANDLER;
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/*
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* handle_wiredtiger_error --
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* Function to handle error callbacks from WiredTiger.
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*/
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int
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handle_wiredtiger_error(WT_EVENT_HANDLER *handler,
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WT_SESSION *session, int error, const char *message)
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{
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CUSTOM_EVENT_HANDLER *custom_handler;
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/* Cast the handler back to our custom handler. */
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custom_handler = (CUSTOM_EVENT_HANDLER *)handler;
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/* Report the error on the console. */
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fprintf(stderr,
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"app_id %s, thread context %p, error %d, message %s\n",
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custom_handler->app_id, session, error, message);
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return (0);
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}
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/*
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* handle_wiredtiger_message --
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* Function to handle message callbacks from WiredTiger.
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*/
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int
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handle_wiredtiger_message(
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WT_EVENT_HANDLER *handler, WT_SESSION *session, const char *message)
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{
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/* Cast the handler back to our custom handler. */
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printf("app id %s, thread context %p, message %s\n",
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((CUSTOM_EVENT_HANDLER *)handler)->app_id, session, message);
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return (0);
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}
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/*! [Function event_handler] */
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static int
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config_event_handler(void)
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{
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WT_CONNECTION *conn;
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WT_SESSION *session;
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int ret;
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/*! [Configure event_handler] */
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CUSTOM_EVENT_HANDLER event_handler;
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event_handler.h.handle_error = handle_wiredtiger_error;
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event_handler.h.handle_message = handle_wiredtiger_message;
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/* Set handlers to NULL to use the default handler. */
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event_handler.h.handle_progress = NULL;
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event_handler.h.handle_close = NULL;
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event_handler.app_id = "example_event_handler";
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ret = wiredtiger_open(home,
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(WT_EVENT_HANDLER *)&event_handler, "create", &conn);
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/*! [Configure event_handler] */
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/* Make an invalid API call, to ensure the event handler works. */
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(void)conn->open_session(conn, NULL, "isolation=invalid", &session);
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if (ret == 0)
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ret = conn->close(conn, NULL);
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return (ret);
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}
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int
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main(void)
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{
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/*
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* Create a clean test directory for this run of the test program if the
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* environment variable isn't already set (as is done by make check).
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*/
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if (getenv("WIREDTIGER_HOME") == NULL) {
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home = "WT_HOME";
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(void)system("rm -rf WT_HOME && mkdir WT_HOME");
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} else
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home = NULL;
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return (config_event_handler());
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}
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