Http2RemoteFlowController.java — netty Source File

Source Code

/*
 * 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:
 *
 * https://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.channel.ChannelHandlerContext;

/**
 * A {@link Http2FlowController} for controlling the flow of outbound {@code DATA} frames to the remote
 * endpoint.
 */
public interface Http2RemoteFlowController extends Http2FlowController {
    /**
     * Get the {@link ChannelHandlerContext} for which to apply flow control on.
     * <p>
     * This is intended for us by {@link FlowControlled} implementations only. Use with caution.
     * @return The {@link ChannelHandlerContext} for which to apply flow control on.
     */
    ChannelHandlerContext channelHandlerContext();

    /**
     * Queues a payload for transmission to the remote endpoint. There is no guarantee as to when the data
     * will be written or how it will be assigned to frames.
     * before sending.
     * <p>
     * Writes do not actually occur until {@link #writePendingBytes()} is called.
     *
     * @param stream the subject stream. Must not be the connection stream object.
     * @param payload payload to write subject to flow-control accounting and ordering rules.
     */
    void addFlowControlled(Http2Stream stream, FlowControlled payload);

    /**
     * Determine if {@code stream} has any {@link FlowControlled} frames currently queued.
     * @param stream the stream to check if it has flow controlled frames.
     * @return {@code true} if {@code stream} has any {@link FlowControlled} frames currently queued.
     */
    boolean hasFlowControlled(Http2Stream stream);

    /**
     * Write all data pending in the flow controller up to the flow-control limits.
     *
     * @throws Http2Exception throws if a protocol-related error occurred.
     */
    void writePendingBytes() throws Http2Exception;

    /**
     * Set the active listener on the flow-controller.
     *
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