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CG: data structures design + XGROUP CREATE implementation.

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antirez
2018-01-16 15:38:22 +01:00
parent d8207d09ee
commit 58f0c000a5
4 changed files with 143 additions and 2 deletions
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41
src/stream.h
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@ -17,6 +17,7 @@ typedef struct stream {
rax *rax; /* The radix tree holding the stream. */
uint64_t length; /* Number of elements inside this stream. */
streamID last_id; /* Zero if there are yet no items. */
rax *cgroups; /* Consumer groups dictionary: name -> streamCG */
} stream;
/* We define an iterator to iterate stream items in an abstract way, without
@ -44,8 +45,46 @@ typedef struct streamIterator {
unsigned char value_buf[LP_INTBUF_SIZE];
} streamIterator;
/* Prototypes of exported APIs. */
/* Consumer group. */
typedef struct streamCG {
streamID lastid; /* Last delivered (not acknowledged) ID for this
group. Consumers that will just ask for more
messages will served with IDs > than this. */
rax *pel; /* Pending entries list. This is a radix tree that
has every message delivered to consumers (without
the NOACK option) that was yet not acknowledged
as processed. The key of the radix tree is the
ID as a 64 bit big endian number, while the
associated value is a streamNotAcked structure.*/
rax *consumers; /* A radix tree representing the consumers by name
and their associated representation in the form
of streamConsumer structures. */
} streamCG;
/* A specific consumer in a consumer group. */
typedef struct streamConsumer {
mstime_t seen_time; /* Last time this consumer was active. */
sds *name; /* Consumer name. This is how the consumer
will be identified in the consumer group
protocol. Case sensitive. */
rax *pel; /* Consumer specific pending entries list: all
the pending messages delivered to this
consumer not yet acknowledged. Keys are
big endian message IDs, while values are
the same streamNotAcked structure referenced
in the "pel" of the conumser group structure
itself, so the value is shared. */
} streamConsumer;
/* Pending (yet not acknowledged) message in a consumer group. */
typedef struct streamNotAcked {
mstime_t delivery_time; /* Last time this message was delivered. */
uint64_t delivery_count; /* Number of times this message was delivered.*/
streamConsumer *consumer; /* The consumer this message was delivered to
in the last delivery. */
} streamNotAcked;
/* Prototypes of exported APIs. */
struct client;
stream *streamNew(void);