在上一篇文章中说到，dapr默认的状态是不可能跨appid的，也就是只能在相同的应用内访问自己设置的状态数据，dapr支持三种状态的共享配置：appid，nam，none，是通过修改components下的statestore.yaml文件中的keyPrefix配置项来实现的。

说明：本篇所有demo都是接上一篇的代码和配置，不同部分会罗列出来。

appid模式

这种配置是默认的，在上篇中有涉及到，这里为了明确比对，所以列举了出来。

1、statestore.yaml

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:name: statestore
spec:type: state.redisversion: v1metadata:- name: redisHostvalue: redis:6379- name: redisPasswordvalue: ""- name: actorStateStorevalue: "true"- name: keyPrefixvalue: "appid"

2、通过order访问pay设置的key，访问不到数据

3、查看redis中的keys，以各服务的appid作为前缀

name模式

1、statestore.yaml

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:name: statestore
spec:type: state.redisversion: v1metadata:- name: redisHostvalue: redis:6379- name: redisPasswordvalue: ""- name: actorStateStorevalue: "true"- name: keyPrefixvalue: "name"

2、通过order访问pay设置的key，能访问到数据

3、查看redis中的keys，有状态存储的名称作为前缀

多个name的情况该如何实现呢？下面是order服务和pay服务分别有自己的组件配置文件，文件夹分别是components_order，components_pay，状态组件的名称分别是statestore_order和statestore_pay，参见下面的配置文件。

1、docker-compose.yml

version: '3.4'services:#┌────────────────────────────────┐#│ ordersystem app + Dapr sidecar │#└────────────────────────────────┘ordersystem:image: ${DOCKER_REGISTRY-}ordersystemdepends_on:- redis- placementbuild:context: ../dockerfile: /OrderSystem/Dockerfileports:- "3500:3500"volumes:   - ../OrderSystem:/OrderSystem  networks:- b2c-daprordersystem-dapr:image: "daprio/daprd:latest"command: [ "./daprd", "-app-id", "order", "-app-port", "80","-placement-host-address", "placement:50006","-components-path","/components"]build:context: ../depends_on:- ordersystemnetwork_mode: "service:ordersystem"volumes:   - ../components_order:/components  #┌─────────────────────────┐#│ Dapr placement1 service │#└─────────────────────────┘  placement:image: "daprio/dapr"command: ["./placement", "-port", "50006"]ports:- "50006:50006"networks:- b2c-dapr#┌────────────────────┐#│ Redis1 state store │#└────────────────────┘  redis:image: "redis:latest"ports:- "6380:6379"networks:- b2c-dapr###################################################################################################################      #┌───────────────────────────────────┐#│ paymentsystem1 app + Dapr sidecar │#└───────────────────────────────────┘  paymentsystem1:image: ${DOCKER_REGISTRY-}paymentsystemdepends_on:- redis- placementbuild:context: ../dockerfile: /PaymentSystem/Dockerfileports:- "3601:3500"volumes:   - ../PaymentSystem:/PaymentSystem      networks:- b2c-dapr      paymentsystem1-dapr:image: "daprio/daprd:latest"command: [ "./daprd", "-app-id", "pay", "-app-port", "80","-placement-host-address", "placement:50006","-components-path","/components" ]build:context: ../depends_on:- paymentsystem1network_mode: "service:paymentsystem1"volumes:   - ../components_pay:/components #┌───────────────────────────────────┐#│ paymentsystem2 app + Dapr sidecar │#└───────────────────────────────────┘   paymentsystem2:image: ${DOCKER_REGISTRY-}paymentsystemdepends_on:- redis- placement    build:context: ../dockerfile: /PaymentSystem/Dockerfilevolumes:   - ../PaymentSystem:/PaymentSystem            ports:- "3602:3500"networks:- b2c-dapr      paymentsystem2-dapr:image: "daprio/daprd:latest"command: [ "./daprd", "-app-id", "pay", "-app-port", "80" ,"-placement-host-address", "placement:50006","-components-path","/components"]build:context: ../depends_on:- paymentsystem2network_mode: "service:paymentsystem2"volumes:   - ../components_pay:/components      networks:b2c-dapr:

2、components_order文件夹下的statstore.yaml

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:name: statestore_order
spec:type: state.redisversion: v1metadata:- name: redisHostvalue: redis:6379- name: redisPasswordvalue: ""- name: actorStateStorevalue: "true"- name: keyPrefixvalue: "name"

3、components_pay文件夹下的statstore.yaml

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:name: statestore_pay
spec:type: state.redisversion: v1metadata:- name: redisHostvalue: redis:6379- name: redisPasswordvalue: ""- name: actorStateStorevalue: "true"- name: keyPrefixvalue: "name"

4、通过order访问pay设置的key，能访问到数据

5、查看redis中的keys，有状态存储的名称作为前缀

none模式

1、statestore.yaml

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:name: statestore
spec:type: state.redisversion: v1metadata:- name: redisHostvalue: redis:6379- name: redisPasswordvalue: ""- name: actorStateStorevalue: "true"- name: keyPrefixvalue: "none"

2、通过order访问pay设置的key，能访问到数据

3、查看redis中的keys，没有任何前缀

dapr通过简单的配置实现了三种状态数据的共享机制，方便，简捷。所以在使用dapr前，就要把各服务的数据共用规划好，方便配置使用。