com.twosigma.webtau.http.validation.HttpValidationHandlers Maven / Gradle / Ivy

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/*
 * Copyright 2019 TWO SIGMA OPEN SOURCE, LLC
 *
 * 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 com.twosigma.webtau.http.validation;

import com.twosigma.webtau.utils.ServiceLoaderUtils;

import java.util.ArrayList;
import java.util.List;
import java.util.function.Supplier;
import java.util.stream.Stream;

public class HttpValidationHandlers {
    private static final List globalHandlers = ServiceLoaderUtils.load(HttpValidationHandler.class);
    private static final ThreadLocal> localHandlers = ThreadLocal.withInitial(ArrayList::new);

    public static  R withAdditionalHandler(HttpValidationHandler handler, Supplier code) {
        try {
            addLocal(handler);
            return code.get();
        } finally {
            removeLocal(handler);
        }
    }

    public static void validate(HttpValidationResult validationResult) {
        Stream.concat(localHandlers.get().stream(), globalHandlers.stream())
                .forEach(c -> c.validate(validationResult));
    }

    private static void addLocal(HttpValidationHandler handler) {
        localHandlers.get().add(handler);
    }

    private static void removeLocal(HttpValidationHandler handler) {
        localHandlers.get().remove(handler);
    }
}