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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * Copyright 2013 The Netty Project
 *
 * The Netty Project 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 org.jboss.netty.handler.codec.spdy;

import java.util.Set;

/**
 * A SPDY Protocol SETTINGS Frame
 */
public interface SpdySettingsFrame extends SpdyFrame {

    int SETTINGS_MINOR_VERSION                  = 0;
    int SETTINGS_UPLOAD_BANDWIDTH               = 1;
    int SETTINGS_DOWNLOAD_BANDWIDTH             = 2;
    int SETTINGS_ROUND_TRIP_TIME                = 3;
    int SETTINGS_MAX_CONCURRENT_STREAMS         = 4;
    int SETTINGS_CURRENT_CWND                   = 5;
    int SETTINGS_DOWNLOAD_RETRANS_RATE          = 6;
    int SETTINGS_INITIAL_WINDOW_SIZE            = 7;
    int SETTINGS_CLIENT_CERTIFICATE_VECTOR_SIZE = 8;

    /**
     * Returns a {@code Set} of the setting IDs.
     * The set's iterator will return the IDs in ascending order.
     */
    Set getIds();

    /**
     * Returns {@code true} if the setting ID has a value.
     */
    boolean isSet(int id);

    /**
     * Returns the value of the setting ID.
     * Returns -1 if the setting ID is not set.
     */
    int getValue(int id);

    /**
     * Sets the value of the setting ID.
     * The ID cannot be negative and cannot exceed 16777215.
     */
    void setValue(int id, int value);

    /**
     * Sets the value of the setting ID.
     * Sets if the setting should be persisted (should only be set by the server).
     * Sets if the setting is persisted (should only be set by the client).
     * The ID cannot be negative and cannot exceed 16777215.
     */
    void setValue(int id, int value, boolean persistVal, boolean persisted);

    /**
     * Removes the value of the setting ID.
     * Removes all persistence information for the setting.
     */
    void removeValue(int id);

    /**
     * Returns {@code true} if this setting should be persisted.
     * Returns {@code false} if this setting should not be persisted
     *         or if the setting ID has no value.
     */
    boolean isPersistValue(int id);

    /**
     * Sets if this setting should be persisted.
     * Has no effect if the setting ID has no value.
     */
    void setPersistValue(int id, boolean persistValue);

    /**
     * Returns {@code true} if this setting is persisted.
     * Returns {@code false} if this setting should not be persisted
     *         or if the setting ID has no value.
     */
    boolean isPersisted(int id);

    /**
     * Sets if this setting is persisted.
     * Has no effect if the setting ID has no value.
     */
    void setPersisted(int id, boolean persisted);

    /**
     * Returns {@code true} if previously persisted settings should be cleared.
     */
    boolean clearPreviouslyPersistedSettings();

    /**
     * Sets if previously persisted settings should be cleared.
     */
    void setClearPreviouslyPersistedSettings(boolean clear);
}