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service.go
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service.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package frontend
import (
"github.com/uber/cadence/common"
"github.com/uber/cadence/common/messaging"
"github.com/uber/cadence/common/mocks"
"github.com/uber/cadence/common/persistence"
"github.com/uber/cadence/common/service"
)
// Config represents configuration for cadence-frontend service
type Config struct {
DefaultVisibilityMaxPageSize int32
DefaultHistoryMaxPageSize int32
RPS int
// Persistence settings
HistoryMgrNumConns int
}
// NewConfig returns new service config with default values
func NewConfig() *Config {
return &Config{
DefaultVisibilityMaxPageSize: 1000,
DefaultHistoryMaxPageSize: 1000,
RPS: 1200, // This limit is based on experimental runs.
HistoryMgrNumConns: 10,
}
}
// Service represents the cadence-frontend service
type Service struct {
stopC chan struct{}
config *Config
params *service.BootstrapParams
}
// NewService builds a new cadence-frontend service
func NewService(params *service.BootstrapParams) common.Daemon {
return &Service{
params: params,
config: NewConfig(),
stopC: make(chan struct{}),
}
}
// Start starts the service
func (s *Service) Start() {
var p = s.params
var log = p.Logger
log.Infof("%v starting", common.FrontendServiceName)
base := service.New(p)
metadata, err := persistence.NewCassandraMetadataPersistence(p.CassandraConfig.Hosts,
p.CassandraConfig.Port,
p.CassandraConfig.User,
p.CassandraConfig.Password,
p.CassandraConfig.Datacenter,
p.CassandraConfig.Keyspace,
p.ClusterMetadata.GetCurrentClusterName(),
p.Logger)
if err != nil {
log.Fatalf("failed to create metadata manager: %v", err)
}
metadata = persistence.NewMetadataPersistenceClient(metadata, base.GetMetricsClient())
visibility, err := persistence.NewCassandraVisibilityPersistence(p.CassandraConfig.Hosts,
p.CassandraConfig.Port,
p.CassandraConfig.User,
p.CassandraConfig.Password,
p.CassandraConfig.Datacenter,
p.CassandraConfig.VisibilityKeyspace,
p.Logger)
if err != nil {
log.Fatalf("failed to create visiblity manager: %v", err)
}
visibility = persistence.NewVisibilityPersistenceClient(visibility, base.GetMetricsClient())
history, err := persistence.NewCassandraHistoryPersistence(p.CassandraConfig.Hosts,
p.CassandraConfig.Port,
p.CassandraConfig.User,
p.CassandraConfig.Password,
p.CassandraConfig.Datacenter,
p.CassandraConfig.Keyspace,
s.config.HistoryMgrNumConns,
p.Logger)
if err != nil {
log.Fatalf("Creating Cassandra history manager persistence failed: %v", err)
}
history = persistence.NewHistoryPersistenceClient(history, base.GetMetricsClient())
// TODO when global domain is enabled, uncomment the line below and remove the line after
var kafkaProducer messaging.Producer
if base.GetClusterMetadata().IsGlobalDomainEnabled() {
kafkaProducer, err = base.GetMessagingClient().NewProducer(base.GetClusterMetadata().GetCurrentClusterName())
if err != nil {
log.Fatalf("Creating kafka producer failed: %v", err)
}
} else {
kafkaProducer = &mocks.KafkaProducer{}
}
handler := NewWorkflowHandler(base, s.config, metadata, history, visibility, kafkaProducer)
handler.Start()
log.Infof("%v started", common.FrontendServiceName)
<-s.stopC
base.Stop()
}
// Stop stops the service
func (s *Service) Stop() {
select {
case s.stopC <- struct{}{}:
default:
}
s.params.Logger.Infof("%v stopped", common.FrontendServiceName)
}