Factor MetadataStore, MetadataReporter, and MetadataAgent into their own files.

src/Makefile

@@ -41,7 +41,10 @@ endif
 
 SRCS=\
      metadatad.cc \
+     agent.cc \
      api_server.cc \
+     store.cc \
+     reporter.cc \
      configuration.cc \
      updater.cc \
      instance.cc \

src/agent.cc

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2018 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **/
+
+#include "agent.h"
+
+#include "configuration.h"
+#include "api_server.h"
+#include "reporter.h"
+
+namespace google {
+
+MetadataAgent::MetadataAgent(const MetadataAgentConfiguration& config)
+    : config_(config), store_(config_) {}
+
+MetadataAgent::~MetadataAgent() {}
+
+void MetadataAgent::start() {
+  metadata_api_server_.reset(new MetadataApiServer(
+      config_, store_, config_.MetadataApiNumThreads(), "0.0.0.0",
+      config_.MetadataApiPort()));
+  reporter_.reset(new MetadataReporter(
+      config_, &store_, config_.MetadataReporterIntervalSeconds()));
+}
+
+}

src/agent.h

@@ -0,0 +1,71 @@
+/*
+ * Copyright 2018 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **/
+#ifndef AGENT_H_
+#define AGENT_H_
+
+//#include "config.h"
+
+#include <memory>
+
+#include "store.h"
+
+namespace google {
+
+// Configuration object.
+class MetadataAgentConfiguration;
+
+// A server that implements the metadata agent API.
+class MetadataApiServer;
+
+// A periodic reporter of metadata to Stackdriver.
+class MetadataReporter;
+
+// Runs the metadata tasks.
+class MetadataAgent {
+ public:
+  MetadataAgent(const MetadataAgentConfiguration& config);
+  ~MetadataAgent();
+
+  // Starts serving.
+  void start();
+
+  const MetadataAgentConfiguration& config() const {
+    return config_;
+  }
+
+  const MetadataStore& store() const {
+    return store_;
+  }
+
+  MetadataStore* mutable_store() {
+    return &store_;
+  }
+
+ private:
+  const MetadataAgentConfiguration& config_;
+
+  // The store for the metadata.
+  MetadataStore store_;
+
+  // The Metadata API server.
+  std::unique_ptr<MetadataApiServer> metadata_api_server_;
+  // The metadata reporter.
+  std::unique_ptr<MetadataReporter> reporter_;
+};
+
+}
+
+#endif  // AGENT_H_