github.com/m3db/m3@v1.5.0/src/msg/producer/writer/router.go (about)

     1  // Copyright (c) 2018 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package writer
    22  
    23  import (
    24  	"fmt"
    25  	"sync"
    26  )
    27  
    28  type ackRouter interface {
    29  	// Ack acks the metadata.
    30  	Ack(ack metadata) error
    31  
    32  	// Register registers a message writer.
    33  	Register(replicatedShardID uint64, mw messageWriter)
    34  
    35  	// Unregister removes a message writer.
    36  	Unregister(replicatedShardID uint64)
    37  }
    38  
    39  type router struct {
    40  	sync.RWMutex
    41  
    42  	messageWriters map[uint64]messageWriter
    43  }
    44  
    45  func newAckRouter(size int) ackRouter {
    46  	return &router{
    47  		messageWriters: make(map[uint64]messageWriter, size),
    48  	}
    49  }
    50  
    51  func (r *router) Ack(meta metadata) error {
    52  	r.RLock()
    53  	mw, ok := r.messageWriters[meta.shard]
    54  	r.RUnlock()
    55  	if !ok {
    56  		// Unexpected.
    57  		return fmt.Errorf("can't find shard %v", meta.shard)
    58  	}
    59  	mw.Ack(meta)
    60  	return nil
    61  }
    62  
    63  func (r *router) Register(replicatedShardID uint64, mw messageWriter) {
    64  	r.Lock()
    65  	r.messageWriters[replicatedShardID] = mw
    66  	r.Unlock()
    67  }
    68  
    69  func (r *router) Unregister(replicatedShardID uint64) {
    70  	r.Lock()
    71  	delete(r.messageWriters, replicatedShardID)
    72  	r.Unlock()
    73  }