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"""
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
"""
import kafka.errors as Errors
NONEXIST_TOPIC = '__null_topic__'
class ProcessorContext(object):
def __init__(self, task_id, task, record_collector, state_mgr, **config):
self.config = config
self._task = task
self.record_collector = record_collector
self.task_id = task_id
self.state_mgr = state_mgr
#self.metrics = metrics
self.key_serializer = config['key_serializer']
self.value_serializer = config['value_serializer']
self.key_deserializer = config['key_deserializer']
self.value_deserializer = config['value_deserializer']
self._initialized = False
def initialized(self):
self._initialized = True
@property
def application_id(self):
return self._task.application_id
def state_dir(self):
return self.state_mgr.base_dir()
def register(self, state_store, logging_enabled, state_restore_callback):
if self._initialized:
raise Errors.IllegalStateError('Can only create state stores during initialization.')
self.state_mgr.register(state_store, logging_enabled, state_restore_callback)
def get_state_store(self, name):
"""
Raises TopologyBuilderError if an attempt is made to access this state store from an unknown node
"""
node = self._task.node()
if not node:
raise Errors.TopologyBuilderError('Accessing from an unknown node')
# TODO: restore this once we fix the ValueGetter initialization issue
#if (!node.stateStores.contains(name))
# throw new TopologyBuilderException("Processor " + node.name() + " has no access to StateStore " + name);
return self.state_mgr.get_store(name)
def topic(self):
if self._task.record() is None:
raise Errors.IllegalStateError('This should not happen as topic() should only be called while a record is processed')
topic = self._task.record().topic()
if topic == NONEXIST_TOPIC:
return None
else:
return topic
def partition(self):
if self._task.record() is None:
raise Errors.IllegalStateError('This should not happen as partition() should only be called while a record is processed')
return self._task.record().partition()
def offset(self):
if self._task.record() is None:
raise Errors.IllegalStateError('This should not happen as offset() should only be called while a record is processed')
return self._task.record().offset()
def timestamp(self):
if self._task.record() is None:
raise Errors.IllegalStateError('This should not happen as timestamp() should only be called while a record is processed')
return self._task.record().timestamp
def forward(self, key, value, child_index=None, child_name=None):
self._task.forward(key, value, child_index=child_index, child_name=child_name)
def commit(self):
self._task.need_commit()
def schedule(self, interval):
self._task.schedule(interval)
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