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/*
 * Copyright (c) 2022 VMware Inc. or its affiliates, All Rights Reserved.
 *
 * 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
 *
 *   https://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 reactor.util.context;

import java.util.Map;
import java.util.function.Predicate;

import io.micrometer.context.ContextAccessor;

import reactor.util.annotation.Nullable;

/**
 * A {@code ContextAccessor} to enable reading values from a Reactor
 * {@link ContextView} and writing values to {@link Context}.
 * 

* Please note that this public class implements the {@code libs.micrometer.contextPropagation} * SPI library, which is an optional dependency. * * @author Rossen Stoyanchev * @author Simon Baslé * @since 3.5.0 */ public final class ReactorContextAccessor implements ContextAccessor { @Override public Class readableType() { return ContextView.class; } @Override public void readValues(ContextView source, Predicate keyPredicate, Map target) { source.forEach((k, v) -> { if (keyPredicate.test(k)) { target.put(k, v); } }); } @Override @Nullable public T readValue(ContextView sourceContext, Object key) { return sourceContext.getOrDefault(key, null); } @Override public Class writeableType() { return Context.class; } @Override public Context writeValues(Map source, Context target) { return target.putAllMap(source); } }