Twelve-Factorは 設定をコードから厳密に分離すること を要求する。

public class  MyAppWithGetConfigFromProgram {

    public Response invokeMicroserviceWithConfig() {
        // Config インスタンスの取得
        Config config = ConfigProvider.getConfig();
        // マイクロサービス A の URL を取得
        String microserviceA = config.getValue("URL_OF_MICROSERVICE_A", String.class);
        // マイクロサービス A の呼び出し
        return invokeMicroservice(microserviceA);
    }
}

@ApplicationScoped
public class MyAppWithGetConfigFromAnnotation {

    @Inject
    private Config config;

    //The property myprj.some.url must exist in one of the configsources, otherwise a
    //DeploymentException will be thrown.
    @Inject
    @ConfigProperty(name="myprj.some.url")
    private String someUrl;

    //The following code injects an Optional value of myprj.some.port property.
    //Contrary to natively injecting the configured value, this will not lead to a
    //DeploymentException if the value is missing.
    @Inject
    @ConfigProperty(name="myprj.some.port")
    private Optional<Integer> somePort;
}

.
├── pom.xml
├── readme.md
└── src
    └── main
        ├── java
        │   └── com
        │       └── yoshio3
        │           └── MPConfigSample
        │               ├── HelloController.java
        │               ├── MPConfigSampleRestApplication.java
        │               └── config
        │                   └── ConfigTestController.java
        ├── resources
        │   └── META-INF
        │       └── microprofile-config.properties
        └── webapp
            ├── WEB-INF
            │   └── beans.xml
            └── index.html
11 directories, 8 files

package com.yoshio3.MPConfigSample.config;

import org.eclipse.microprofile.config.Config;
import org.eclipse.microprofile.config.ConfigProvider;
import org.eclipse.microprofile.config.inject.ConfigProperty;

import javax.enterprise.context.RequestScoped;
import javax.inject.Inject;
import javax.ws.rs.GET;
import javax.ws.rs.Path;

@Path("/config")
@RequestScoped
public class ConfigTestController {

    @Inject
    @ConfigProperty(name = "injected.value")
    private String injectedValue;

    @Path("/injected")
    @GET
    public String getInjectedConfigValue() {
        return "Config value as Injected by CDI " + injectedValue;
    }

    @Path("/lookup")
    @GET
    public String getLookupConfigValue() {
        Config config = ConfigProvider.getConfig();
        String value = config.getValue("value", String.class);
        return "Config value from ConfigProvider " + value;
    }
}

$ curl -X GET http://localhost:8080/data/config/injected
$ curl -X GET http://localhost:8080/data/config/lookup

# プロパティ・ファイルの場所
└── src
    └── main
        ├── resources
        │   └── META-INF
        │       └── microprofile-config.properties

# プロパティ・ファイルに設定された値
injected.value=Injected value
value=lookup value

# プロジェクトのビルド
$ mvn clean package

# アプリケーションの実行
$ java -jar target/MPConfigSample-microbundle.jar 

......
Payara Micro URLs:
http://192.168.100.7:8080/

'ROOT' REST Endpoints:
GET     /data/application.wadl
GET     /data/config/injected
GET     /data/config/lookup
GET     /data/hello
GET     /openapi/
GET     /openapi/application.wadl
]]
[2020-03-10T22:19:06.610+0900] [] [情報] [] [PayaraMicro] [tid: _ThreadID=1 _ThreadName=main] [timeMillis: 1583846346610] [levelValue: 800] Payara Micro  5.194 #badassmicrofish (build 327) ready in 32,755 (ms)
[2020-03-10T22:19:33.646+0900] [] [情報] [] [javax.enterprise.system.container.web.com.sun.web.security] [tid: _ThreadID=29 _ThreadName=http-thread-pool::http-listener(1)] [timeMillis: 1583846373646] [levelValue: 800] Context path from ServletContext:  differs from path from bundle: /

# アノテーションで実装されたエンドポイントへの呼び出し
$ curl localhost:8080/data/config/injected
Config value as Injected by CDI Injected value

# プログラムで実装されたエンドポイントへの呼び出し
$ curl localhost:8080/data/config/lookup
Config value from ConfigProvider lookup value

# 環境変数の設定 [.(ドット）を _(アンダーバー）に置き換えて設定]
$ export injected_value="Environment Value"

# 環境変数を Java のシステム・プロパティに設定してアプリを実行
$ java -D"$injected_value" -jar target/MPConfigSample-microbundle.jar

# アプリケーションの動作確認
$ curl http://localhost:8080/data/config/injected
Config value as Injected by CDI Environment Value

FROM payara/micro:5.201

USER payara
WORKDIR ${PAYARA_HOME}

# Deploy Artifact
COPY ./target/MPConfigSample.war $DEPLOY_DIR

CMD ["--nocluster","--deploymentDir", "/opt/payara/deployments", "--contextroot", "app"]

$ docker build -t tyoshio2002/payara-config-sample:1.0 .

# コマンド実行時のコンソール出力例
Sending build context to Docker daemon  151.2MB
Step 1/5 : FROM payara/micro:5.201
5.201: Pulling from payara/micro
050382585609: Already exists 
59f5185426ac: Already exists 
4d95208cd9c0: Pull complete 
c1409397cf71: Pull complete 
Digest: sha256:3ff92627d0d9b67454ee241cc7d5f2e485e46db81a886c87cf16035df7c80cc8
Status: Downloaded newer image for payara/micro:5.201
 ---> a11a548b0a25
Step 2/5 : USER payara
 ---> Running in cb755e484e79
Removing intermediate container cb755e484e79
 ---> 564283252ae4
Step 3/5 : WORKDIR ${PAYARA_HOME}
 ---> Running in f26dd5cd172c
Removing intermediate container f26dd5cd172c
 ---> f2bf88b18a77
Step 4/5 : COPY ./target/MPConfigSample.war $DEPLOY_DIR
 ---> 1b54373fe95a
Step 5/5 : CMD ["--nocluster","--deploymentDir", "/opt/payara/deployments", "--contextroot", "app"]
 ---> Running in 3eb731eb77c3
Removing intermediate container 3eb731eb77c3
 ---> 1d11549e99b8
Successfully built 1d11549e99b8
Successfully tagged tyoshio2002/payara-config-sample:1.0

$ docker run -p 8080:8080 -e injected_value=hogehoge -it tyoshio2002/payara-config-sample:1.0

# コマンド実行時のコンソール出力例
..... (中略)
[2020-03-11T07:46:59.119+0000] [] [INFO] [] [PayaraMicro] [tid: _ThreadID=1 _ThreadName=main] [timeMillis: 1583912819119] [levelValue: 800] [[ 
{
    "Instance Configuration": {
        "Host": "3877abb54d57",
        "Http Port(s)": "8080",
        "Https Port(s)": "",
        "Instance Name": "payara-micro",
        "Instance Group": "no-cluster",
        "Deployed": [
            {
                "Name": "MPConfigSample",
                "Type": "war",
                "Context Root": "/app"
            }
        ]
    }
}]]
[2020-03-11T07:46:59.131+0000] [] [INFO] [] [PayaraMicro] [tid: _ThreadID=1 _ThreadName=main] [timeMillis: 1583912819131] [levelValue: 800] [[
Payara Micro URLs:
http://3877abb54d57:8080/app
'MPConfigSample' REST Endpoints:
GET /app/data/application.wadl
GET /app/data/config/injected
GET /app/data/config/lookup
GET /app/data/hello
]]
[2020-03-11T07:46:59.131+0000] [] [INFO] [] [PayaraMicro] [tid: _ThreadID=1 _ThreadName=main] [timeMillis: 1583912819131] [levelValue: 800] Payara Micro  5.201 #badassmicrofish (build 512) ready in 31,286 (ms)

$ curl http://localhost:8080/app/data/config/injected
Config value as Injected by CDI hogehoge

$ az group create --name WebApp-Containers --location "Japan East"
{
  "id": "/subscriptions/f77aafe8-****-****-****-d0c37687ef70/resourceGroups/WebApp-Containers",
  "location": "japaneast",
  "managedBy": null,
  "name": "WebApp-Containers",
  "properties": {
    "provisioningState": "Succeeded"
  },
  "tags": null,
  "type": "Microsoft.Resources/resourceGroups"
}

$ az acr create --name containerreg4yoshio --resource-group WebApp-Containers --sku Basic --admin-enabled true
{
  "adminUserEnabled": true,
  "creationDate": "2020-03-12T02:27:59.357654+00:00",
  "id": "/subscriptions/f77aafe8-****-****-****-d0c37687ef70/resourceGroups/WebApp-Containers/providers/Microsoft.ContainerRegistry/registries/containerreg4yoshio",
  "location": "japaneast",
  "loginServer": "containerreg4yoshio.azurecr.io",
  "name": "containerreg4yoshio",
  "networkRuleSet": null,
  "policies": {
    "quarantinePolicy": {
      "status": "disabled"
    },
    "retentionPolicy": {
      "days": 7,
      "lastUpdatedTime": "2020-03-12T02:28:01.654662+00:00",
      "status": "disabled"
    },
    "trustPolicy": {
      "status": "disabled",
      "type": "Notary"
    }
  },
  "provisioningState": "Succeeded",
  "resourceGroup": "WebApp-Containers",
  "sku": {
    "name": "Basic",
    "tier": "Basic"
  },
  "status": null,
  "storageAccount": null,
  "tags": {},
  "type": "Microsoft.ContainerRegistry/registries"
}

$ az acr credential show --name containerreg4yoshio --resource-group WebApp-Containers
{
  "passwords": [
    {
      "name": "password",
      "value": "4zaIiLk*************+H1XO4AlYFvN"
    },
    {
      "name": "password2",
      "value": "fT03XPs*************Oq2cAZiVHV+L"
    }
  ],
  "username": "containerreg4yoshio"
}

# Azure Container Registry にログイン
$ docker login containerreg4yoshio.azurecr.io -u containerreg4yoshio
Password: 
Login Succeeded

# Docker コンテナのタグ付け
$ docker tag tyoshio2002/payara-config-sample:1.0 containerreg4yoshio.azurecr.io/tyoshio2002/payara-config-sample:1.0

# Azure Container Registry にタグ付けしたイメージを Push
$ docker push containerreg4yoshio.azurecr.io/tyoshio2002/payara-config-sample:1.0

The push refers to repository [containerreg4yoshio.azurecr.io/tyoshio2002/payara-config-sample]
bbd197848553: Pushed 
ec40a5d738cc: Pushed 
f95fe3528c56: Pushed 
bded2364df91: Pushed 
1bfeebd65323: Pushed 
1.0: digest: sha256:689dbacc212d37afe09c43417bc79d8e241c3fa7b5cf71c27097ef535cf77f76 size: 1368

$ az acr repository list -n containerreg4yoshio -g WebApp-Containers
Argument 'resource_group_name' has been deprecated and will be removed in a future release.
[
  "tyoshio2002/payara-config-sample"
]

$ az acr repository show-tags --name containerreg4yoshio  --repository tyoshio2002/payara-config-sample
[
  "1.0"
]

$ az group create --name WebApp --location "Japan East"
{
  "id": "/subscriptions/f77aafe8-****-****-****-d0c37687ef70/resourceGroups/WebApp",
  "location": "japaneast",
  "managedBy": null,
  "name": "WebApp",
  "properties": {
    "provisioningState": "Succeeded"
  },
  "tags": null,
  "type": "Microsoft.Resources/resourceGroups"
}

$ az appservice plan create --name webapp4container --resource-group WebApp --sku B1 --is-linux
{
  "freeOfferExpirationTime": "2020-04-11T02:38:56.873333",
  "geoRegion": "Japan East",
  "hostingEnvironmentProfile": null,
  "hyperV": false,
  "id": "/subscriptions/f77aafe8-****-****-****-d0c37687ef70/resourceGroups/WebApp/providers/Microsoft.Web/serverfarms/webapp4container",
  "isSpot": false,
  "isXenon": false,
  "kind": "linux",
  "location": "Japan East",
  "maximumElasticWorkerCount": 1,
  "maximumNumberOfWorkers": 3,
  "name": "webapp4container",
  "numberOfSites": 0,
  "perSiteScaling": false,
  "provisioningState": "Succeeded",
  "reserved": true,
  "resourceGroup": "WebApp",
  "sku": {
    "capabilities": null,
    "capacity": 1,
    "family": "B",
    "locations": null,
    "name": "B1",
    "size": "B1",
    "skuCapacity": null,
    "tier": "Basic"
  },
  "spotExpirationTime": null,
  "status": "Ready",
  "subscription": "f77aafe8-****-****-****-d0c37687ef70",
  "tags": null,
  "targetWorkerCount": 0,
  "targetWorkerSizeId": 0,
  "type": "Microsoft.Web/serverfarms",
  "workerTierName": null
}

$ az webapp create --resource-group WebApp \ 
                               --plan webapp4container \
                               --name yoshiowebapp \
                               --deployment-container-image-name containerreg4yoshio.azurecr.io/tyoshio2002/payara-config-sample:1.0

No credential was provided to access Azure Container Registry. Trying to look up...
{
  "availabilityState": "Normal",
  "clientAffinityEnabled": true,
  "clientCertEnabled": false,
  "clientCertExclusionPaths": null,
  "cloningInfo": null,
  "containerSize": 0,
  "dailyMemoryTimeQuota": 0,
  "defaultHostName": "yoshiowebapp.azurewebsites.net",
  "enabled": true,
  "enabledHostNames": [
    "yoshiowebapp.azurewebsites.net",
    "yoshiowebapp.scm.azurewebsites.net"
  ],
  "ftpPublishingUrl": "ftp://waws-prod-ty1-***.ftp.azurewebsites.windows.net/site/wwwroot",
  "geoDistributions": null,
  "hostNameSslStates": [
    {
      "hostType": "Standard",
      "ipBasedSslResult": null,
      "ipBasedSslState": "NotConfigured",
      "name": "yoshiowebapp.azurewebsites.net",
      "sslState": "Disabled",
      "thumbprint": null,
      "toUpdate": null,
      "toUpdateIpBasedSsl": null,
      "virtualIp": null
    },
    {
      "hostType": "Repository",
      "ipBasedSslResult": null,
      "ipBasedSslState": "NotConfigured",
      "name": "yoshiowebapp.scm.azurewebsites.net",
      "sslState": "Disabled",
      "thumbprint": null,
      "toUpdate": null,
      "toUpdateIpBasedSsl": null,
      "virtualIp": null
    }
  ],
  "hostNames": [
    "yoshiowebapp.azurewebsites.net"
  ],
  "hostNamesDisabled": false,
  "hostingEnvironmentProfile": null,
  "httpsOnly": false,
  "hyperV": false,
  "id": "/subscriptions/f77aafe8-****-****-****-d0c37687ef70/resourceGroups/WebApp/providers/Microsoft.Web/sites/yoshiowebapp",
  "identity": null,
  "inProgressOperationId": null,
  "isDefaultContainer": null,
  "isXenon": false,
  "kind": "app,linux,container",
  "lastModifiedTimeUtc": "2020-03-12T02:39:50.356666",
  "location": "Japan East",
  "maxNumberOfWorkers": null,
  "name": "yoshiowebapp",
  "outboundIpAddresses": "13.**.***.96,13.**.**.49,13.**.**.66,13.**.**.140,13.**.**.186",
  "possibleOutboundIpAddresses": "13.**.**.96,13.**.**.49,13.**.**.66,13.**.**.140,13.**.**.186,13.**.**.30,13.**.**.70,13.**.**.101,13.**.**.163,13.**.**.200",
  "redundancyMode": "None",
  "repositorySiteName": "yoshiowebapp",
  "reserved": true,
  "resourceGroup": "WebApp",
  "scmSiteAlsoStopped": false,
  "serverFarmId": "/subscriptions/f77aafe8-****-****-****-d0c37687ef70/resourceGroups/WebApp/providers/Microsoft.Web/serverfarms/webapp4container",
  "siteConfig": null,
  "slotSwapStatus": null,
  "state": "Running",
  "suspendedTill": null,
  "tags": null,
  "targetSwapSlot": null,
  "trafficManagerHostNames": null,
  "type": "Microsoft.Web/sites",
  "usageState": "Normal"
}

$ curl https://yoshiowebapp.azurewebsites.net/app/data/config/injected
Config value as Injected by CDI Injected value

$ az webapp config appsettings set --resource-group WebApp --name yoshiowebapp --settings injected_value="Value from Server App Setting"
[
  {
    "name": "WEBSITES_ENABLE_APP_SERVICE_STORAGE",
    "slotSetting": false,
    "value": "false"
  },
  {
    "name": "DOCKER_REGISTRY_SERVER_URL",
    "slotSetting": false,
    "value": "containerreg4yoshio.azurecr.io/tyoshio2002"
  },
  {
    "name": "DOCKER_REGISTRY_SERVER_USERNAME",
    "slotSetting": false,
    "value": "containerreg4yoshio"
  },
  {
    "name": "DOCKER_REGISTRY_SERVER_PASSWORD",
    "slotSetting": false,
    "value": null
  },
  {
    "name": "WEBSITES_PORT",
    "slotSetting": false,
    "value": "8080"
  },
  {
    "name": "injected_value",
    "slotSetting": false,
    "value": "Value from Server App Setting"
  }
]

$ curl https://yoshiowebapp.azurewebsites.net/app/data/config/injected
Config value as Injected by CDI Value from Server App Setting