Add value injection example

.travis.yml

@@ -23,4 +23,5 @@ script:
   - dub build --build=release --config=applicationContextExample
   - dub build --build=release --config=registerOnResolveExample
   - dub build --build=release --config=constructorInjectionExample
+  - dub build --build=release --config=valueInjectionExample
 # - dub build --build=ddox

dub.json

@@ -114,6 +114,18 @@
 			"importPaths": [
 				"source"
 			]
+		},
+		{
+			"name" : "valueInjectionExample",
+			"description" : "Example where values are injected into dependencies.",
+			"targetType": "executable",
+			"targetName": "valueInjectionExample",
+			"sourcePaths": [
+				"example/valueinjection"
+			],
+			"importPaths": [
+				"source"
+			]
 		}
 	]
 }

example/valueinjection/app.d

@@ -0,0 +1,64 @@
+/**
+ * Poodinis Dependency Injection Framework
+ * Copyright 2014-2016 Mike Bierlee
+ * This software is licensed under the terms of the MIT license.
+ * The full terms of the license can be found in the LICENSE file.
+ */
+
+import poodinis;
+
+import std.stdio;
+import std.string;
+
+class IntValueInjector : ValueInjector!int {
+	int get(string key) {
+		switch(key) {
+			case "http.port":
+				return 8080;
+			case "http.keep_alive":
+				return 60;
+			default:
+				throw new ValueNotAvailableException(key);
+		}
+	}
+}
+
+class StringValueInjector : ValueInjector!string {
+	string get(string key) {
+		switch(key) {
+			case "http.hostname":
+				return "acme.org";
+			default:
+				throw new ValueNotAvailableException(key);
+		}
+	}
+}
+
+class HttpServer {
+
+	@Value("http.port")
+	private int port = 80;
+
+	@Value("http.hostname")
+	private string hostName = "localhost";
+
+	@Value("http.max_connections")
+	private int maxConnections = 1000; // Default assignment is kept because max_connections is not available within the injector
+
+	@MandatoryValue("http.keep_alive")
+	private int keepAliveTime; // A ResolveException is thrown when the value is not available, default assignments are not used.
+
+	public void serve() {
+		writeln(format("Serving pages for %s:%s with max connection count of %s", hostName, port, maxConnections));
+	}
+}
+
+void main() {
+	auto dependencies = new shared DependencyContainer();
+	dependencies.register!(ValueInjector!int, IntValueInjector);
+	dependencies.register!(ValueInjector!string, StringValueInjector);
+	dependencies.register!HttpServer;
+
+	auto server = dependencies.resolve!HttpServer;
+	server.serve(); // Prints "Serving pages for acme.org:8080 with max connection count of 1000"
+}