github.com/adnan-c/fabric_e2e_couchdb@v0.6.1-preview.0.20170228180935-21ce6b23cf91/orderer/kafka/partitioner.go (about)

     1  /*
     2  Copyright IBM Corp. 2016 All Rights Reserved.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8                   http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package kafka
    18  
    19  import "github.com/Shopify/sarama"
    20  
    21  // newStaticPartitioner returns a PartitionerConstructor that
    22  // returns a Partitioner that always chooses the specified partition.
    23  func newStaticPartitioner(partition int32) sarama.PartitionerConstructor {
    24  	return func(topic string) sarama.Partitioner {
    25  		return &staticPartitioner{partition}
    26  	}
    27  }
    28  
    29  type staticPartitioner struct {
    30  	partitionID int32
    31  }
    32  
    33  // Partition takes a message and partition count and chooses a partition.
    34  func (p *staticPartitioner) Partition(message *sarama.ProducerMessage, numPartitions int32) (int32, error) {
    35  	return p.partitionID, nil
    36  }
    37  
    38  // RequiresConsistency indicates to the user of the partitioner
    39  // whether the mapping of key->partition is consistent or not.
    40  func (p *staticPartitioner) RequiresConsistency() bool {
    41  	return true
    42  }