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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2014 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * 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.undertow.attribute;

import io.undertow.server.HttpServerExchange;

/**
 * Representation of a string attribute from a HTTP server exchange.
 *
 *
 * @author Stuart Douglas
 */
public interface ExchangeAttribute {

    /**
     * Resolve the attribute from the HTTP server exchange. This may return null if the attribute is not present.
     * @param exchange The exchange
     * @return The attribute
     */
    String readAttribute(final HttpServerExchange exchange);

    /**
     * Sets a new value for the attribute. Not all attributes are writable.
     * @param exchange The exchange
     * @param newValue The new value for the attribute
     * @throws  ReadOnlyAttributeException when attribute cannot be written
     */
    void writeAttribute(final HttpServerExchange exchange, final String newValue) throws ReadOnlyAttributeException;
}