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from __future__ import absolute_import
import logging
import random
from itertools import cycle
from six.moves import xrange
from .base import (
Producer, BATCH_SEND_DEFAULT_INTERVAL,
BATCH_SEND_MSG_COUNT
)
log = logging.getLogger("kafka")
class SimpleProducer(Producer):
"""
A simple, round-robin producer. Each message goes to exactly one partition
Params:
client - The Kafka client instance to use
async - If True, the messages are sent asynchronously via another
thread (process). We will not wait for a response to these
req_acks - A value indicating the acknowledgements that the server must
receive before responding to the request
ack_timeout - Value (in milliseconds) indicating a timeout for waiting
for an acknowledgement
batch_send - If True, messages are send in batches
batch_send_every_n - If set, messages are send in batches of this size
batch_send_every_t - If set, messages are send after this timeout
random_start - If true, randomize the initial partition which the
the first message block will be published to, otherwise
if false, the first message block will always publish
to partition 0 before cycling through each partition
"""
def __init__(self, client, async=False,
req_acks=Producer.ACK_AFTER_LOCAL_WRITE,
ack_timeout=Producer.DEFAULT_ACK_TIMEOUT,
codec=None,
batch_send=False,
batch_send_every_n=BATCH_SEND_MSG_COUNT,
batch_send_every_t=BATCH_SEND_DEFAULT_INTERVAL,
random_start=False):
self.partition_cycles = {}
self.random_start = random_start
super(SimpleProducer, self).__init__(client, async, req_acks,
ack_timeout, codec, batch_send,
batch_send_every_n,
batch_send_every_t)
def _next_partition(self, topic):
if topic not in self.partition_cycles:
if not self.client.has_metadata_for_topic(topic):
self.client.load_metadata_for_topics(topic)
self.partition_cycles[topic] = cycle(self.client.get_partition_ids_for_topic(topic))
# Randomize the initial partition that is returned
if self.random_start:
num_partitions = len(self.client.get_partition_ids_for_topic(topic))
for _ in xrange(random.randint(0, num_partitions-1)):
next(self.partition_cycles[topic])
return next(self.partition_cycles[topic])
def send_messages(self, topic, *msg):
partition = self._next_partition(topic)
return super(SimpleProducer, self).send_messages(topic, partition, *msg)
def __repr__(self):
return '<SimpleProducer batch=%s>' % self.async
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