void redisAsyncHandleWrite(redisAsyncContext *ac) {
redisContext *c = &(ac->c);
int done = 0;
// 连接创建失败？？？
if (!(c->flags & REDIS_CONNECTED)) {
/* Abort connect was not successful. */
if (__redisAsyncHandleConnect(ac) != REDIS_OK)
return;
// 再尝试检测 flag
/* Try again later when the context is still not connected. */
if (!(c->flags & REDIS_CONNECTED))
return;
}
if (redisBufferWrite(c,&done) == REDIS_ERR) {
__redisAsyncDisconnect(ac);
} else {
/* Continue writing when not done, stop writing otherwise */
// 当缓冲区中还有数据待发送时，会再次注册写事件
if (!done)
_EL_ADD_WRITE(ac);
// 当缓冲区中没有数据待发送时，会再次注册写事件
else
_EL_DEL_WRITE(ac);
/* Always schedule reads after writes */
_EL_ADD_READ(ac);
}
}
/* This function should be called when the socket is readable.
* It processes all replies that can be read and executes their callbacks.
*/
void redisAsyncHandleRead(redisAsyncContext *ac) {
redisContext *c = &(ac->c);
// 如果连接已经断开，尝试连接
if (!(c->flags & REDIS_CONNECTED)) {
/* Abort connect was not successful. */
if (__redisAsyncHandleConnect(ac) != REDIS_OK)
return;
/* Try again later when the context is still not connected. */
if (!(c->flags & REDIS_CONNECTED))
return;
}
// 读取数据
if (redisBufferRead(c) == REDIS_ERR) {
// 读取错误，断开连接并做一些清理工作
__redisAsyncDisconnect(ac);
} else {
// 读取数据成功，再次注册读事件，
/* Always re-schedule reads */
_EL_ADD_READ(ac);
// 并处理回调函数
redisProcessCallbacks(ac);
}
}
void redisAsyncHandleWrite(redisAsyncContext *ac) {
redisContext *c = &(ac->c);
int done = 0;
int status;
if (!(c->flags & REDIS_CONNECTED)) {
/* Abort connect was not successful. */
if (__redisAsyncHandleConnect(ac) != REDIS_OK)
return;
/* Try again later when the context is still not connected. */
if (!(c->flags & REDIS_CONNECTED))
return;
}
pthread_mutex_lock(&ac->lock);
status = redisBufferWrite(c,&done);
pthread_mutex_unlock(&ac->lock);
if (status == REDIS_ERR) {
__redisAsyncDisconnect(ac);
} else {
/* Continue writing when not done, stop writing otherwise */
if (!done)
_EL_ADD_WRITE(ac);
else
_EL_DEL_WRITE(ac);
/* Always schedule reads after writes */
_EL_ADD_READ(ac);
}
}
/* This function should be called when the socket is readable.
* It processes all replies that can be read and executes their callbacks.
*/
void redisAsyncHandleRead(redisAsyncContext *ac) {
redisContext *c = &(ac->c);
if (!(c->flags & REDIS_CONNECTED)) {
/* Abort connect was not successful. */
if (__redisAsyncHandleConnect(ac) != REDIS_OK)
return;
/* Try again later when the context is still not connected. */
if (!(c->flags & REDIS_CONNECTED))
return;
}
if (redisBufferRead(c) == REDIS_ERR) {
__redisAsyncDisconnect(ac);
} else {
/* Always re-schedule reads */
#ifdef _WIN32
// There appears to be a bug in the Linux version of _EL_ADD_READ which will not reschedule
// the read if already reading. This is a problem if there is a large number of async GET
// operations. If the receive buffer is exhausted with the data returned, the read would
// not be rescheduled, and the async operations would cease. This forces the read to recur.
_EL_FORCE_ADD_READ(ac);
#else
_EL_ADD_READ(ac);
#endif
redisProcessCallbacks(ac);
}
}
/* This function should be called when the socket is readable.
* It processes all replies that can be read and executes their callbacks.
*/
void redisAsyncHandleRead(redisAsyncContext *ac) {
redisContext *c = &(ac->c);
if (!(c->flags & REDIS_CONNECTED)) {
/* Abort connect was not successful. */
if (__redisAsyncHandleConnect(ac) != REDIS_OK)
return;
/* Try again later when the context is still not connected. */
if (!(c->flags & REDIS_CONNECTED))
return;
}
if (redisBufferRead(c) == REDIS_ERR) {
__redisAsyncDisconnect(ac);
} else {
/* Always re-schedule reads */
_EL_ADD_READ(ac);
redisProcessCallbacks(ac);
}
}
int redisAsyncHandleWriteComplete(redisAsyncContext *ac, int written) {
redisContext *c = &(ac->c);
int done = 0;
int rc;
rc = redisBufferWriteDone(c, written, &done);
if (rc == REDIS_ERR) {
__redisAsyncDisconnect(ac);
} else {
/* Continue writing when not done, stop writing otherwise */
if (!done)
_EL_ADD_WRITE(ac);
else
_EL_DEL_WRITE(ac);
/* Always schedule reads after writes */
_EL_ADD_READ(ac);
}
return REDIS_OK;
}
