tests/honeynode221/minimal-distribution/src/main/java/io/fd/honeycomb/infra/distro/Main.java

   1 /*
   2  * Copyright (c) 2016 Cisco and/or its affiliates.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package io.fd.honeycomb.infra.distro;
  18
  19 import static com.google.inject.Guice.createInjector;
  20
  21 import com.google.common.collect.ImmutableSet;
  22 import com.google.inject.ConfigurationException;
  23 import com.google.inject.CreationException;
  24 import com.google.inject.Injector;
  25 import com.google.inject.Key;
  26 import com.google.inject.Module;
  27 import com.google.inject.ProvisionException;
  28 import com.google.inject.name.Names;
  29
  30 import io.fd.honeycomb.data.init.DataTreeInitializer;
  31 import io.fd.honeycomb.data.init.InitializerRegistry;
  32 import io.fd.honeycomb.infra.distro.activation.ActivationModule;
  33 import io.fd.honeycomb.infra.distro.activation.ActiveModules;
  34 import io.fd.honeycomb.infra.distro.initializer.InitializerPipelineModule;
  35
  36 import org.slf4j.Logger;
  37 import org.slf4j.LoggerFactory;
  38
  39 public final class Main {
  40
  41     private static final Logger LOG = LoggerFactory.getLogger(Main.class);
  42
  43     private Main() {
  44     }
  45
  46     public static void main(String[] args) {
  47         init(new ActivationModule());
  48     }
  49
  50     /**
  51      * Initialize the Honeycomb with provided modules
  52      */
  53     public static Injector init(final ActivationModule activationModule) {
  54         try {
  55             LOG.info("Starting honeycomb");
  56             // creating child injector does not work in this case, so just create injector, and does not store ref
  57             // to it, or its active modules instance
  58             Injector injector = createInjector(ImmutableSet.<Module>builder()
  59                     .add(activationModule)
  60                     .addAll(createInjector(activationModule).getInstance(ActiveModules.class).createModuleInstances())
  61                     .build());
  62
  63             // Log all bindings
  64             injector.getAllBindings().entrySet().stream()
  65                     .forEach(e -> LOG.trace("Component available under: {} is {}", e.getKey(), e.getValue()));
  66
  67             try {
  68                 LOG.info("Initializing configuration");
  69                 injector.getInstance(Key.get(InitializerRegistry.class,
  70                         Names.named(InitializerPipelineModule.HONEYCOMB_INITIALIZER))).initialize();
  71                 LOG.info("Configuration initialized successfully");
  72             } catch (DataTreeInitializer.InitializeException e) {
  73                 LOG.error("Unable to initialize configuration", e);
  74             }
  75
  76
  77             LOG.info("Honeycomb started successfully!");
  78             return injector;
  79         } catch (CreationException | ProvisionException | ConfigurationException e) {
  80             LOG.error("Failed to initialize Honeycomb components", e);
  81             throw e;
  82         } catch (RuntimeException e) {
  83             LOG.error("Unexpected initialization failure", e);
  84             throw e;
  85         } finally {
  86             // Trigger gc to force collect initial garbage + dedicated classloader
  87             System.gc();
  88         }
  89     }
  90
  91 }