Merge pull request #171 from bpitman/master

Create NoOp module

iep-config/src/main/java/com/netflix/iep/config/DynamicNoOpConfigModule.java

@@ -0,0 +1,100 @@
+/*
+ * Copyright 2015 Netflix, 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.
+ */
+package com.netflix.iep.config;
+
+import com.google.inject.AbstractModule;
+import com.google.inject.Module;
+import com.google.inject.Provides;
+import com.google.inject.util.Modules;
+import com.netflix.archaius.config.PollingDynamicConfig;
+import com.netflix.archaius.config.polling.FixedPollingStrategy;
+import com.netflix.archaius.config.polling.PollingResponse;
+import com.netflix.archaius.config.CompositeConfig;
+import com.netflix.archaius.config.MapConfig;
+import com.netflix.archaius.guice.ArchaiusModule;
+import com.netflix.archaius.inject.ApplicationLayer;
+import com.netflix.archaius.inject.RemoteLayer;
+import com.netflix.archaius.typesafe.TypesafeConfig;
+import com.netflix.iep.platformservice.PlatformServiceModule;
+import com.typesafe.config.Config;
+import com.typesafe.config.ConfigFactory;
+
+import javax.inject.Singleton;
+import java.util.Properties;
+import java.util.concurrent.Callable;
+import java.util.concurrent.TimeUnit;
+
+public class DynamicNoOpConfigModule extends AbstractModule {
+
+  private final String[] propFiles;
+
+  public DynamicNoOpConfigModule() {
+    this(null);
+  }
+
+  public DynamicNoOpConfigModule(String[] propFiles) {
+    this.propFiles = propFiles;
+  }
+
+  @Override protected void configure() {
+    Module m = Modules
+        .override(new ArchaiusModule())
+        .with(new OverrideModule(propFiles));
+    install(m);
+  }
+
+  private static class OverrideModule extends AbstractModule {
+
+    private final String[] propFiles;
+
+    OverrideModule(String[] propFiles) {
+      this.propFiles = propFiles;
+    }
+
+    @Override protected void configure() {
+      bind(Config.class).toInstance(ConfigFactory.load());
+      bind(DynamicPropertiesConfiguration.class).asEagerSingleton();
+    }
+
+    @Provides
+    @Singleton
+    @RemoteLayer
+    private com.netflix.archaius.Config providesOverrideConfig(Config cfg) throws Exception {
+      return new PollingDynamicConfig(
+        new Callable() {
+          @Override
+          public PollingResponse call() {
+            return PollingResponse.noop();
+          }
+        },
+        new FixedPollingStrategy(60000, TimeUnit.MILLISECONDS)
+      );
+    }
+
+    @Provides
+    @Singleton
+    @ApplicationLayer
+    protected CompositeConfig providesAppConfig(Config cfg) throws Exception {
+      final Properties props = (propFiles == null)
+          ? ScopedPropertiesLoader.load()
+          : ScopedPropertiesLoader.load(propFiles);
+      final CompositeConfig app = new CompositeConfig();
+      app.addConfig("scoped", new MapConfig(props));
+      app.addConfig("typesafe", new TypesafeConfig(cfg));
+      return app;
+    }
+  }
+}