1 /* Timer API example -- Register and handle timer events 2 * 3 * ----------------------------------------------------------------------------- 4 * 5 * Copyright (c) 2018, Salvatore Sanfilippo <antirez at gmail dot com> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * * Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * * Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * * Neither the name of Redis nor the names of its contributors may be used 17 * to endorse or promote products derived from this software without 18 * specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #define REDISMODULE_EXPERIMENTAL_API 34 #include "../redismodule.h" 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <ctype.h> 38 #include <string.h> 39 40 /* Timer callback. */ 41 void timerHandler(RedisModuleCtx *ctx, void *data) { 42 REDISMODULE_NOT_USED(ctx); 43 printf("Fired %s!\n", data); 44 RedisModule_Free(data); 45 } 46 47 /* HELLOTIMER.TIMER*/ 48 int TimerCommand_RedisCommand(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) { 49 REDISMODULE_NOT_USED(argv); 50 REDISMODULE_NOT_USED(argc); 51 52 for (int j = 0; j < 10; j++) { 53 int delay = rand() % 5000; 54 char *buf = RedisModule_Alloc(256); 55 snprintf(buf,256,"After %d", delay); 56 RedisModuleTimerID tid = RedisModule_CreateTimer(ctx,delay,timerHandler,buf); 57 REDISMODULE_NOT_USED(tid); 58 } 59 return RedisModule_ReplyWithSimpleString(ctx, "OK"); 60 } 61 62 /* This function must be present on each Redis module. It is used in order to 63 * register the commands into the Redis server. */ 64 int RedisModule_OnLoad(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) { 65 REDISMODULE_NOT_USED(argv); 66 REDISMODULE_NOT_USED(argc); 67 68 if (RedisModule_Init(ctx,"hellotimer",1,REDISMODULE_APIVER_1) 69 == REDISMODULE_ERR) return REDISMODULE_ERR; 70 71 if (RedisModule_CreateCommand(ctx,"hellotimer.timer", 72 TimerCommand_RedisCommand,"readonly",0,0,0) == REDISMODULE_ERR) 73 return REDISMODULE_ERR; 74 75 return REDISMODULE_OK; 76 } 77