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from __future__ import absolute_import
import logging
from kafka.partitioner import HashedPartitioner
from .base import (
Producer, BATCH_SEND_DEFAULT_INTERVAL,
BATCH_SEND_MSG_COUNT
)
log = logging.getLogger("kafka")
class KeyedProducer(Producer):
"""
A producer which distributes messages to partitions based on the key
Args:
client - The kafka client instance
partitioner - A partitioner class that will be used to get the partition
to send the message to. Must be derived from Partitioner
async - If True, the messages are sent asynchronously via another
thread (process). We will not wait for a response to these
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
"""
def __init__(self, client, partitioner=None, 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):
if not partitioner:
partitioner = HashedPartitioner
self.partitioner_class = partitioner
self.partitioners = {}
super(KeyedProducer, self).__init__(client, async, req_acks,
ack_timeout, codec, batch_send,
batch_send_every_n,
batch_send_every_t)
def _next_partition(self, topic, key):
if topic not in self.partitioners:
if not self.client.has_metadata_for_topic(topic):
self.client.load_metadata_for_topics(topic)
self.partitioners[topic] = self.partitioner_class(self.client.get_partition_ids_for_topic(topic))
partitioner = self.partitioners[topic]
return partitioner.partition(key, self.client.get_partition_ids_for_topic(topic))
def send_messages(self,topic,key,*msg):
partition = self._next_partition(topic, key)
return self._send_messages(topic, partition, *msg,key=key)
def send(self, topic, key, msg):
partition = self._next_partition(topic, key)
return self._send_messages(topic, partition, msg, key=key)
def __repr__(self):
return '<KeyedProducer batch=%s>' % self.async
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