Line data    Source code

       1             : // Copyright (C) 2021 The Android Open Source Project
       2             : //
       3             : // Licensed under the Apache License, Version 2.0 (the "License");
       4             : // you may not use this file except in compliance with the License.
       5             : // You may obtain a copy of the License at
       6             : //
       7             : // http://www.apache.org/licenses/LICENSE-2.0
       8             : //
       9             : // Unless required by applicable law or agreed to in writing, software
      10             : // distributed under the License is distributed on an "AS IS" BASIS,
      11             : // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      12             : // See the License for the specific language governing permissions and
      13             : // limitations under the License.
      14             : 
      15             : package com.google.gerrit.server.experiments;
      16             : 
      17             : import com.google.common.collect.ImmutableSet;
      18             : import com.google.gerrit.server.config.GerritServerConfig;
      19             : import com.google.inject.AbstractModule;
      20             : import com.google.inject.Inject;
      21             : import com.google.inject.Singleton;
      22             : import java.util.Arrays;
      23             : import java.util.HashSet;
      24             : import java.util.Set;
      25             : import org.eclipse.jgit.lib.Config;
      26             : 
      27             : /**
      28             :  * An implementation of {@link ExperimentFeatures} that uses gerrit.config to evaluate the status of
      29             :  * the feature.
      30             :  */
      31             : @Singleton
      32             : public class ConfigExperimentFeatures implements ExperimentFeatures {
      33             : 
      34         152 :   public static class ConfigExperimentFeaturesModule extends AbstractModule {
      35             :     @Override
      36             :     protected void configure() {
      37         152 :       bind(ExperimentFeatures.class).to(ConfigExperimentFeatures.class);
      38         152 :     }
      39             :   }
      40             : 
      41             :   private ImmutableSet<String> enabledExperimentFeatures;
      42             : 
      43             :   @Inject
      44         150 :   public ConfigExperimentFeatures(@GerritServerConfig Config gerritServerConfig) {
      45         150 :     Set<String> enabledExperiments = new HashSet<>();
      46         150 :     Arrays.stream(gerritServerConfig.getStringList("experiments", null, "enabled"))
      47         150 :         .forEach(enabledExperiments::add);
      48         150 :     ExperimentFeaturesConstants.DEFAULT_ENABLED_FEATURES.forEach(enabledExperiments::add);
      49         150 :     Arrays.stream(gerritServerConfig.getStringList("experiments", null, "disabled"))
      50         150 :         .forEach(enabledExperiments::remove);
      51         150 :     enabledExperimentFeatures = ImmutableSet.copyOf(enabledExperiments);
      52         150 :   }
      53             : 
      54             :   @Override
      55             :   public boolean isFeatureEnabled(String featureFlag) {
      56           3 :     return getEnabledExperimentFeatures().contains(featureFlag);
      57             :   }
      58             : 
      59             :   @Override
      60             :   public ImmutableSet<String> getEnabledExperimentFeatures() {
      61           4 :     return enabledExperimentFeatures;
      62             :   }
      63             : }