+++ /dev/null
-/*
- * Copyright (c) 2017 Cisco and/or its affiliates.
- *
- * 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 io.fd.honeycomb.infra.distro.activation;
-
-import com.google.inject.Inject;
-import com.google.inject.Module;
-import com.google.inject.Provider;
-import io.fd.honeycomb.infra.distro.schema.ResourceLoader;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Set;
-import java.util.stream.Collectors;
-import javax.annotation.Nonnull;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-/**
- * Provides list of active modules for distribution
- */
-public class ActiveModuleProvider implements Provider<ActiveModules>, ResourceLoader {
-
- private static final Logger LOG = LoggerFactory.getLogger(ActiveModuleProvider.class);
-
- @Inject
- private ActivationConfig config;
-
- @Override
- public ActiveModules get() {
- return new ActiveModules(loadActiveModules(
- aggregateResources(config.getModulesResourcePath())));
- }
-
- /**
- * Provide unique set of active modules filtered from provided resources
- */
- static Set<Class<? extends Module>> loadActiveModules(@Nonnull final List<String> moduleNames) {
- final ClassLoader classLoader = ActiveModuleProvider.class.getClassLoader();
- LOG.info("Reading active modules configuration for distribution");
-
- // process resources to resource modules
- return moduleNames.stream()
- .map(String::trim)
- .filter(trimmedLine -> trimmedLine.length() != 0)
- // filter out commented lines
- .filter(nonEmptyLine -> !nonEmptyLine.startsWith("//"))
- // filter duplicates
- .distinct()
- .map(validLine -> moduleNameToClass(validLine, classLoader))
- // filters out classes that are not modules
- .filter(ActiveModuleProvider::filterNonModules)
- .collect(Collectors.toSet());
- }
-
- /**
- * Aggregate all resources from provided relative path into a {@code List<String>}
- */
- public List<String> aggregateResources(final String relativePath) {
- // must use universal approach of loading from folder/jar
- // because of memory footprint benchmark
- return new ArrayList<>(loadResourceContentsOnPath(relativePath));
- }
-
- private static boolean filterNonModules(final Class<?> clazz) {
- final boolean isModule = Module.class.isAssignableFrom(clazz);
- if (!isModule) {
- LOG.warn("Class {} is provided in modules configuration, but is not a Module and will be ignored", clazz);
- }
- return isModule;
- }
-
- /**
- * Loads class by provided name
- */
- private static Class<? extends Module> moduleNameToClass(final String name,
- final ClassLoader classLoader) {
- try {
- LOG.debug("Loading module class {}", name);
- return (Class<? extends Module>) classLoader.loadClass(name);
- } catch (ClassNotFoundException e) {
- LOG.error("Unable to convert {} to class, make sure you've provided sources to classpath", name);
- throw new IllegalStateException(
- "Unable to convert " + name + " to class, make sure you've provided sources to classpath", e);
- }
- }
-}