github.com/lirm/aeron-go@v0.0.0-20230415210743-920325491dc4/aeron/counter.go (about)

     1  // Copyright 2022 Steven Stern
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  // http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package aeron
    16  
    17  import (
    18  	"github.com/lirm/aeron-go/aeron/atomic"
    19  	"github.com/lirm/aeron-go/aeron/counters"
    20  )
    21  
    22  type Counter struct {
    23  	registrationId  int64
    24  	clientConductor *ClientConductor
    25  	atomicCounter   *counters.AtomicCounter
    26  	counterId       int32
    27  	isClosed        atomic.Bool
    28  }
    29  
    30  func NewCounter(
    31  	registrationId int64,
    32  	clientConductor *ClientConductor,
    33  	counterId int32) (*Counter, error) {
    34  
    35  	counter := new(Counter)
    36  	counter.registrationId = registrationId
    37  	counter.clientConductor = clientConductor
    38  	atomicCounter, err := counters.NewAtomicCounter(clientConductor.CounterReader(), counterId)
    39  	if err != nil {
    40  		return nil, err
    41  	}
    42  	counter.atomicCounter = atomicCounter
    43  	counter.counterId = counterId
    44  
    45  	return counter, nil
    46  }
    47  
    48  func (c *Counter) RegistrationId() int64 {
    49  	return c.registrationId
    50  }
    51  
    52  func (c *Counter) Id() int32 {
    53  	return c.counterId
    54  }
    55  
    56  func (c *Counter) Counter() *counters.AtomicCounter {
    57  	return c.atomicCounter
    58  }
    59  
    60  func (c *Counter) Close() error {
    61  	if c.isClosed.CompareAndSet(false, true) {
    62  		if c.clientConductor != nil {
    63  			return c.clientConductor.releaseCounter(*c)
    64  		}
    65  	}
    66  	return nil
    67  }
    68  
    69  func (c *Counter) IsClosed() bool {
    70  	return c.isClosed.Get()
    71  }