github.com/m3db/m3@v1.5.0/src/msg/topic/types.go (about)

     1  // Copyright (c) 2018 Uber Technologies, Inc.
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     4  // of this software and associated documentation files (the "Software"), to deal
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    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,
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    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 topic
    22  
    23  import (
    24  	"github.com/m3db/m3/src/cluster/client"
    25  	"github.com/m3db/m3/src/cluster/kv"
    26  	"github.com/m3db/m3/src/cluster/services"
    27  )
    28  
    29  // Topic defines the topic of messages.
    30  type Topic interface {
    31  	// Name returns the name of the topic.
    32  	Name() string
    33  
    34  	// SetName sets the name of the topic.
    35  	SetName(value string) Topic
    36  
    37  	// NumberOfShards returns the total number of shards of the topic.
    38  	NumberOfShards() uint32
    39  
    40  	// SetNumberOfShards sets the total number of shards of the topic.
    41  	SetNumberOfShards(value uint32) Topic
    42  
    43  	// ConsumerServices returns the consumers of the topic.
    44  	ConsumerServices() []ConsumerService
    45  
    46  	// SetConsumerServices sets the consumers of the topic.
    47  	SetConsumerServices(value []ConsumerService) Topic
    48  
    49  	// Version returns the version of the topic.
    50  	Version() int
    51  
    52  	// SetVersion sets the version of the topic.
    53  	SetVersion(value int) Topic
    54  
    55  	// AddConsumerService adds a consumer to the topic.
    56  	AddConsumerService(value ConsumerService) (Topic, error)
    57  
    58  	// RemoveConsumerService removes a consumer from the topic.
    59  	RemoveConsumerService(value services.ServiceID) (Topic, error)
    60  
    61  	// UpdateConsumerService updates a consumer in the topic.
    62  	UpdateConsumerService(value ConsumerService) (Topic, error)
    63  
    64  	// String returns the string representation of the topic.
    65  	String() string
    66  
    67  	// Validate validates the topic.
    68  	Validate() error
    69  }
    70  
    71  // ConsumerService is a service that consumes the messages in a topic.
    72  type ConsumerService interface {
    73  	// ServiceID returns the service id of the consumer service.
    74  	ServiceID() services.ServiceID
    75  
    76  	// SetServiceID sets the service id of the consumer service.
    77  	SetServiceID(value services.ServiceID) ConsumerService
    78  
    79  	// ConsumptionType returns the consumption type of the consumer service.
    80  	ConsumptionType() ConsumptionType
    81  
    82  	// SetConsumptionType sets the consumption type of the consumer service.
    83  	SetConsumptionType(value ConsumptionType) ConsumerService
    84  
    85  	// MessageTTLNanos returns ttl for each message in nanoseconds.
    86  	MessageTTLNanos() int64
    87  
    88  	// SetMessageTTLNanos sets ttl for each message in nanoseconds.
    89  	SetMessageTTLNanos(value int64) ConsumerService
    90  
    91  	// String returns the string representation of the consumer service.
    92  	String() string
    93  }
    94  
    95  // Watch watches the updates of a topic.
    96  type Watch interface {
    97  	// C returns the notification channel.
    98  	C() <-chan struct{}
    99  
   100  	// Get returns the latest version of the topic.
   101  	Get() (Topic, error)
   102  
   103  	// Close stops watching for topic updates.
   104  	Close()
   105  }
   106  
   107  // Service provides accessibility to topics.
   108  type Service interface {
   109  	// Get returns the topic and version for the given name.
   110  	Get(name string) (Topic, error)
   111  
   112  	// CheckAndSet sets the topic for the name if the version matches.
   113  	CheckAndSet(t Topic, version int) (Topic, error)
   114  
   115  	// Delete deletes the topic with the name.
   116  	Delete(name string) error
   117  
   118  	// Watch returns a topic watch.
   119  	Watch(name string) (Watch, error)
   120  }
   121  
   122  // ServiceOptions configures the topic service.
   123  type ServiceOptions interface {
   124  	// ConfigService returns the client of config service.
   125  	ConfigService() client.Client
   126  
   127  	// SetConfigService sets the client of config service.
   128  	SetConfigService(c client.Client) ServiceOptions
   129  
   130  	// KVOverrideOptions returns the override options for KV store.
   131  	KVOverrideOptions() kv.OverrideOptions
   132  
   133  	// SetKVOverrideOptions sets the override options for KV store.
   134  	SetKVOverrideOptions(value kv.OverrideOptions) ServiceOptions
   135  }
   136  
   137  // ConsumptionType defines how the consumer consumes messages.
   138  type ConsumptionType string
   139  
   140  const (
   141  	// Unknown is the unknown consumption type.
   142  	Unknown ConsumptionType = "unknown"
   143  
   144  	// Shared means the messages for each shard will be
   145  	// shared by all the responsible instances.
   146  	Shared ConsumptionType = "shared"
   147  
   148  	// Replicated means the messages for each shard will be
   149  	// replicated to all the responsible instances.
   150  	Replicated ConsumptionType = "replicated"
   151  )