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EnvVariablesConfigStore.java
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EnvVariablesConfigStore.java
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/*
* Copyright (c) 2014 Red Hat, Inc. and others
*
* Red Hat licenses this file to you 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.vertx.config.impl.spi;
import io.vertx.config.spi.ConfigStore;
import io.vertx.config.spi.utils.JsonObjectHelper;
import io.vertx.core.Future;
import io.vertx.core.Vertx;
import io.vertx.core.buffer.Buffer;
import io.vertx.core.internal.VertxInternal;
import io.vertx.core.json.JsonArray;
import io.vertx.core.json.JsonObject;
import java.util.Collection;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Supplier;
/**
* An implementation of configuration store loading the content from the environment variables.
* <p>
* As this configuration store is a singleton, the factory returns always the same instance.
*
* @author <a href="http://escoffier.me">Clement Escoffier</a>
*/
public class EnvVariablesConfigStore implements ConfigStore {
private final VertxInternal vertx;
private final boolean rawData;
private final Set<String> keys;
private final Supplier<Map<String, String>> getenv;
private final AtomicReference<Buffer> cached = new AtomicReference<>();
public EnvVariablesConfigStore(Vertx vertx, boolean rawData, JsonArray keys, Supplier<Map<String, String>> getenv) {
this.vertx = (VertxInternal) vertx;
this.rawData = rawData;
this.keys = (keys == null) ? null : new HashSet<>(keys.getList());
this.getenv = getenv;
}
@Override
public Future<Buffer> get() {
Buffer value = cached.get();
if (value == null) {
value = all(getenv.get(), rawData, keys).toBuffer();
cached.set(value);
}
return vertx.getOrCreateContext().succeededFuture(value);
}
private static JsonObject all(Map<String, String> env, boolean rawData, Set<String> keys) {
JsonObject json = new JsonObject();
Collection<String> localKeys = keys == null ? env.keySet() : keys;
env.forEach((key, value) -> {
if (localKeys.contains(key)) {
JsonObjectHelper.put(json, key, value, rawData);
}
});
return json;
}
@Override
public Future<Void> close() {
return vertx.getOrCreateContext().succeededFuture();
}
}