Mojo Log service and a thread-safe client library.

services/log/log_impl.h

Index: services/log/log_impl.h
diff --git a/services/log/log_impl.h b/services/log/log_impl.h
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+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef SERVICES_LOG_LOG_IMPL_H_
+#define SERVICES_LOG_LOG_IMPL_H_
+
+#include <stdio.h>
+
+#include <string>
+
+#include "base/macros.h"
+#include "mojo/public/cpp/bindings/interface_request.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+#include "mojo/services/log/interfaces/entry.mojom.h"
+#include "mojo/services/log/interfaces/log.mojom.h"
+
+namespace mojo {
+
+class ApplicationConnection;
+
+namespace log {
+
+// This is an implementation of the log service
+// (see mojo/services/log/interfaces/log.mojom).  It formats incoming messages
+// and writes them to the supplied FILE stream.  It does not take ownership of
+// the FILE stream.
+//
+// This service implementation binds a new Log implementation for each incoming
+// application connection.
+class LogImpl : public Log {
+ public:
+  // LogImpl does not take ownership of |out_file|, so |out_file| must live for
+  // the duration of the incoming connection (which is left undefined).
+  static void Create(ApplicationConnection* connection,
+                     InterfaceRequest<Log> request,
+                     FILE* out_file);
+
+  // |Log| implementation:
+  void AddEntry(EntryPtr entry) override;
+
+ private:
+  LogImpl(const std::string& remote_url,
+          InterfaceRequest<Log> request,
+          FILE* out_file);
+  ~LogImpl() override;
+
+  std::string FormatEntry(const EntryPtr& entry);
+
+  const std::string remote_url_;
+  StrongBinding<Log> binding_;
+  FILE* out_file_;
+
+  DISALLOW_COPY_AND_ASSIGN(LogImpl);
+};
+
+}  // namespace log
+}  // namespace mojo
+
+#endif  // SERVICES_LOG_LOG_IMPL_H_