File-based and multicast InstrumentationServer implementations.

pkg/analyzer/lib/instrumentation/file_instrumentation.dart

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library instrumentation;
+
+import 'dart:io';
+
+import 'package:analyzer/instrumentation/instrumentation.dart';
+
+
+/**
+ * An [InstrumentationServer] that writes to a file.
+ */
+class FileInstrumentationServer implements InstrumentationServer {
+  IOSink _sink;
+
+  FileInstrumentationServer(String path) {
+    File file = new File(path);
+    _sink = file.openWrite(mode: FileMode.APPEND);
+  }
+
+  @override
+  void log(String message) {
+    _sink.writeln(message);
+  }
+
+  @override
+  void logWithPriority(String message) {
+    log(message);
+  }
+
+  @override
+  void shutdown() {
+    _sink.close();
+    _sink = null;
+  }
+}