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/*
 * Copyright 2014 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 io.netty.handler.codec.http2;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.util.internal.UnstableApi;

import java.io.Closeable;
import java.util.List;

/**
 * Handler for inbound traffic on behalf of {@link Http2ConnectionHandler}. Performs basic protocol
 * conformance on inbound frames before calling the delegate {@link Http2FrameListener} for
 * application-specific processing. Note that frames of an unknown type (i.e. HTTP/2 extensions)
 * will skip all protocol checks and be given directly to the listener for processing.
 */
@UnstableApi
public interface Http2ConnectionDecoder extends Closeable {

    /**
     * Sets the lifecycle manager. Must be called as part of initialization before the decoder is used.
     */
    void lifecycleManager(Http2LifecycleManager lifecycleManager);

    /**
     * Provides direct access to the underlying connection.
     */
    Http2Connection connection();

    /**
     * Provides the local flow controller for managing inbound traffic.
     */
    Http2LocalFlowController flowController();

    /**
     * Set the {@link Http2FrameListener} which will be notified when frames are decoded.
     * 

* This must be set before frames are decoded. */ void frameListener(Http2FrameListener listener); /** * Get the {@link Http2FrameListener} which will be notified when frames are decoded. */ Http2FrameListener frameListener(); /** * Called by the {@link Http2ConnectionHandler} to decode the next frame from the input buffer. */ void decodeFrame(ChannelHandlerContext ctx, ByteBuf in, List out) throws Http2Exception; /** * Gets the local settings for this endpoint of the HTTP/2 connection. */ Http2Settings localSettings(); /** * Indicates whether or not the first initial {@code SETTINGS} frame was received from the remote endpoint. */ boolean prefaceReceived(); @Override void close(); }