Dependency injection sample

Author: danielgerlag

WorkflowCore.Sample15/HelloWorldWorkflow.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using WorkflowCore.Interface;
+using WorkflowCore.Models;
+using WorkflowCore.Sample15.Steps;
+
+namespace WorkflowCore.Sample15
+{
+    public class HelloWorldWorkflow : IWorkflow
+    {
+        public void Build(IWorkflowBuilder<object> builder)
+        {
+            builder                
+                .StartWith<HelloWorld>()
+                .Then<DoSomething>();
+        }
+
+        public string Id => "HelloWorld";
+            
+        public int Version => 1;
+                 
+    }
+}

WorkflowCore.Sample15/Program.cs

@@ -0,0 +1,43 @@
+using System;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
+using WorkflowCore.Interface;
+using WorkflowCore.Sample15.Steps;
+using WorkflowCore.Sample15.Services;
+
+namespace WorkflowCore.Sample15
+{
+    class Program
+    {
+        public static void Main(string[] args)
+        {
+            IServiceProvider serviceProvider = ConfigureServices();
+
+            //start the workflow host
+            var host = serviceProvider.GetService<IWorkflowHost>();
+            host.RegisterWorkflow<HelloWorldWorkflow>();
+            host.Start();
+
+            host.StartWorkflow("HelloWorld", 1, null);
+
+            Console.ReadLine();
+            host.Stop();
+        }
+
+        private static IServiceProvider ConfigureServices()
+        {
+            //setup dependency injection
+            IServiceCollection services = new ServiceCollection();
+            services.AddLogging();
+            services.AddWorkflow();
+            
+            services.AddTransient<DoSomething>();
+            services.AddTransient<IMyService, MyService>();
+
+            var serviceProvider = services.BuildServiceProvider();
+
+            return serviceProvider;
+        }
+
+    }
+}

WorkflowCore.Sample15/README.md

@@ -0,0 +1,51 @@
+# Dependency Injection Sample
+
+Illustrates the use of dependency injection for workflow steps.
+
+Consider the following service
+
+```C#
+public interface IMyService
+{
+    void DoTheThings();
+}
+...
+public class MyService : IMyService
+{
+    public void DoTheThings()
+    {
+        Console.WriteLine("Doing stuff...");
+    }
+}
+```
+
+Which is consumed by a workflow step as follows
+
+```C#
+public class DoSomething : StepBody
+{
+    private IMyService _myService;
+
+    public DoSomething(IMyService myService)
+    {
+        _myService = myService;
+    }
+
+    public override ExecutionResult Run(IStepExecutionContext context)
+    {
+        _myService.DoTheThings();
+        return ExecutionResult.Next();
+    }
+}
+```
+
+Simply add both the service and the workflow step as transients to the service collection when setting up your IoC container.
+
+```C#
+IServiceCollection services = new ServiceCollection();
+services.AddLogging();
+services.AddWorkflow();
+            
+services.AddTransient<DoSomething>();
+services.AddTransient<IMyService, MyService>();
+```

WorkflowCore.Sample15/Services/IMyService.cs

@@ -0,0 +1,7 @@
+namespace WorkflowCore.Sample15.Services
+{
+    public interface IMyService
+    {
+        void DoTheThings();
+    }
+}

WorkflowCore.Sample15/Services/MyService.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace WorkflowCore.Sample15.Services
+{
+    public class MyService : IMyService
+    {
+        public void DoTheThings()
+        {
+            Console.WriteLine("Doing stuff...");
+        }
+    }
+}

WorkflowCore.Sample15/Steps/DoSomething.cs

@@ -0,0 +1,27 @@
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using WorkflowCore.Interface;
+using WorkflowCore.Models;
+using WorkflowCore.Sample15.Services;
+
+namespace WorkflowCore.Sample15.Steps
+{
+    public class DoSomething : StepBody
+    {
+        private IMyService _myService;
+
+        public DoSomething(IMyService myService)
+        {
+            _myService = myService;
+        }
+
+        public override ExecutionResult Run(IStepExecutionContext context)
+        {
+            _myService.DoTheThings();
+            return ExecutionResult.Next();
+        }
+    }
+}

WorkflowCore.Sample15/Steps/HelloWorld.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using WorkflowCore.Interface;
+using WorkflowCore.Models;
+
+namespace WorkflowCore.Sample15.Steps
+{
+    public class HelloWorld : StepBody
+    {
+        public override ExecutionResult Run(IStepExecutionContext context)
+        {
+            Console.WriteLine("Hello world");
+            return ExecutionResult.Next();
+        }
+    }
+}

WorkflowCore.Sample15/WorkflowCore.Sample15.csproj

@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="2.0.0" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="2.0.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\src\WorkflowCore\WorkflowCore.csproj" />
+  </ItemGroup>
+
+</Project>

WorkflowCore.sln

@@ -99,6 +99,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "WorkflowCore.TestSample01",
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Docker.Testify", "test\Docker.Testify\Docker.Testify.csproj", "{EC497168-5347-4E70-9D9E-9C2F826C1CDF}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WorkflowCore.Sample15", "WorkflowCore.Sample15\WorkflowCore.Sample15.csproj", "{F9FD8357-C299-4CF4-B0D4-D3D5E45AAAA3}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -253,6 +255,10 @@ Global
 		{EC497168-5347-4E70-9D9E-9C2F826C1CDF}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{EC497168-5347-4E70-9D9E-9C2F826C1CDF}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{EC497168-5347-4E70-9D9E-9C2F826C1CDF}.Release|Any CPU.Build.0 = Release|Any CPU
+		{F9FD8357-C299-4CF4-B0D4-D3D5E45AAAA3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{F9FD8357-C299-4CF4-B0D4-D3D5E45AAAA3}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{F9FD8357-C299-4CF4-B0D4-D3D5E45AAAA3}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{F9FD8357-C299-4CF4-B0D4-D3D5E45AAAA3}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -298,6 +304,7 @@ Global
 		{62A9709E-27DA-42EE-B94F-5AF431D86354} = {E6CEAD8D-F565-471E-A0DC-676F54EAEDEB}
 		{0E3C1496-8E7C-411A-A536-C7C9CE4EED4E} = {5080DB09-CBE8-4C45-9957-C3BB7651755E}
 		{EC497168-5347-4E70-9D9E-9C2F826C1CDF} = {E6CEAD8D-F565-471E-A0DC-676F54EAEDEB}
+		{F9FD8357-C299-4CF4-B0D4-D3D5E45AAAA3} = {5080DB09-CBE8-4C45-9957-C3BB7651755E}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {DC0FA8D3-6449-4FDA-BB46-ECF58FAD23B4}