org.xnio.channels.Configurable Maven / Gradle / Ivy

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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 2008 Red Hat, Inc. 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 org.xnio.channels;

import java.io.IOException;
import org.xnio.Option;

/**
 * A channel that has parameters that may be configured while the channel is open.
 *
 * @apiviz.exclude
 */
public interface Configurable {

    /**
     * Determine whether an option is supported on this channel.
     *
     * @param option the option
     * @return {@code true} if it is supported
     */
    boolean supportsOption(Option option);

    /**
     * Get the value of a channel option.
     *
     * @param  the type of the option value
     * @param option the option to get
     * @return the value of the option, or {@code null} if it is not set
     * @throws IOException if an I/O error occurred when reading the option
     */
     T getOption(Option option) throws IOException;

    /**
     * Set an option for this channel.  Unsupported options are ignored.
     *
     * @param  the type of the option value
     * @param option the option to set
     * @param value the value of the option to set
     * @return the previous option value, if any
     * @throws IllegalArgumentException if the value is not acceptable for this option
     * @throws IOException if an I/O error occurred when modifying the option
     */
     T setOption(Option option, T value) throws IllegalArgumentException, IOException;

    /**
     * An empty configurable instance.
     */
    Configurable EMPTY = new Configurable() {
        public boolean supportsOption(final Option option) {
            return false;
        }

        public  T getOption(final Option option) throws IOException {
            return null;
        }

        public  T setOption(final Option option, final T value) throws IllegalArgumentException, IOException {
            return null;
        }
    };
}