Register outputs by name

core/src/main/java/io/jstach/rainbowgum/LogOutputRegistry.java

@@ -11,6 +11,7 @@
 import java.util.concurrent.ConcurrentHashMap;
 
 import io.jstach.rainbowgum.LogOutput.OutputProvider;
+import io.jstach.rainbowgum.output.ListLogOutput;
 
 /**
  * Register output providers by URI scheme.
@@ -20,7 +21,12 @@ public sealed interface LogOutputRegistry extends OutputProvider permits Default
 	/**
 	 * A meta URI scheme to reference outputs registered somewhere else.
 	 */
-	public static String NAMED_OUTPUT_SCHEME = "output";
+	public static String NAMED_OUTPUT_SCHEME = "name";
+
+	/**
+	 * The URI scheme for list provider.
+	 */
+	public static String LIST_OUTPUT_SCHEME = "list";
 
 	/**
 	 * Register a provider by {@link URI#getScheme() scheme}.
@@ -66,7 +72,12 @@ public void register(String scheme, OutputProvider provider) {
 
 	@Override
 	public void register(String name, LogOutput output) {
-		outputs.put(name, output);
+		_register(name, output);
+	}
+
+	private LogOutput _register(String name, LogOutput output) {
+		outputs.putIfAbsent(name, output);
+		return output;
 	}
 
 	@Override
@@ -82,16 +93,16 @@ LogOutput provide(String name, LogProperties properties) throws IOException {
 		return output(URI.create(name + ":///"), name, properties);
 	}
 
+	@SuppressWarnings("resource")
 	@Override
 	public LogOutput output(URI uri, String name, LogProperties properties) throws IOException {
 		String scheme = uri.getScheme();
 		String path = uri.getPath();
 		OutputProvider customProvider;
 		if (scheme == null && path != null) {
 			if (name.equals(LogAppender.FILE_APPENDER_NAME)) {
-				@SuppressWarnings("resource")
 				FileOutputStream fos = new FileOutputStream(path);
-				return LogOutput.of(uri, fos.getChannel());
+				return _register(name, LogOutput.of(uri, fos.getChannel()));
 			}
 			else {
 				return provide(name, properties);
@@ -106,19 +117,22 @@ else if (NAMED_OUTPUT_SCHEME.equals(scheme)) {
 			return output(_name).orElseThrow(() -> new IOException("Output for name: " + _name + " not found."));
 		}
 		else if (LogOutput.STDOUT_SCHEME.equals(scheme)) {
-			return LogOutput.ofStandardOut();
+			return _register(name, LogOutput.ofStandardOut());
 		}
 		else if (LogOutput.STDERR_SCHEME.equals(scheme)) {
-			return LogOutput.ofStandardErr();
+			return _register(name, LogOutput.ofStandardErr());
+		}
+		else if (LIST_OUTPUT_SCHEME.equals(scheme)) {
+			return _register(name, new ListLogOutput());
 		}
 		else if ((customProvider = providers.get(scheme)) != null) {
-			return customProvider.output(uri, name, properties);
+			return _register(name, customProvider.output(uri, name, properties));
 		}
 		else {
 			var p = Paths.get(uri);
 			var channel = FileChannel.open(p, StandardOpenOption.APPEND, StandardOpenOption.CREATE);
 			channel.close();
-			return LogOutput.of(uri, channel);
+			return _register(name, LogOutput.of(uri, channel));
 		}
 	}
 

rainbowgum-json/src/test/java/io/jstach/rainbowgum/json/encoder/GelfEncoderTest.java

@@ -88,7 +88,9 @@ void testFullLoad() throws Exception {
 	@Test
 	void testFullLoadUri() throws Exception {
 		String properties = """
-				logging.appender.console.encoder=gelf://localhost/?prettyPrint=false
+				logging.appenders=list
+				logging.appender.list.output=list:///
+				logging.appender.list.encoder=gelf://somehost/?prettyPrint=false
 				""";
 		LogConfig config = LogConfig.builder()
 			.properties(LogProperties.builder().fromProperties(properties).build())
@@ -98,6 +100,12 @@ void testFullLoadUri() throws Exception {
 			Instant instant = Instant.ofEpochMilli(1);
 			LogEvent e = LogEvent.of(System.Logger.Level.INFO, "gelf", "hello", null).freeze(instant);
 			r.log(e);
+			ListLogOutput output = (ListLogOutput) config.outputRegistry().output("list").orElseThrow();
+			String actual = output.events().get(0).getValue();
+			String expected = "{\"host\":\"somehost\",\"short_message\":\"hello\","
+					+ "\"timestamp\":0.001,\"level\":6,\"_time\":\"1970-01-01T00:00:00.001Z\","
+					+ "\"_level\":\"INFO\",\"_logger\":\"gelf\",\"_thread_name\":\"main\",\"_thread_id\":\"1\",\"version\":\"1.1\"}\n";
+			assertEquals(expected, actual);
 		}
 	}