DefaultHttp2LocalFlowController.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 static io.netty.handler.codec.http2.Http2CodecUtil.CONNECTION_STREAM_ID;
import static io.netty.handler.codec.http2.Http2CodecUtil.DEFAULT_WINDOW_SIZE;
import static io.netty.handler.codec.http2.Http2CodecUtil.MAX_INITIAL_WINDOW_SIZE;
import static io.netty.handler.codec.http2.Http2CodecUtil.MIN_INITIAL_WINDOW_SIZE;
import static io.netty.handler.codec.http2.Http2Error.FLOW_CONTROL_ERROR;
import static io.netty.handler.codec.http2.Http2Error.INTERNAL_ERROR;
import static io.netty.handler.codec.http2.Http2Exception.connectionError;
import static io.netty.handler.codec.http2.Http2Exception.streamError;
import static io.netty.util.internal.ObjectUtil.checkNotNull;
import static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;
import static java.lang.Math.max;
import static java.lang.Math.min;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.http2.Http2Exception.CompositeStreamException;
import io.netty.handler.codec.http2.Http2Exception.StreamException;
import io.netty.util.internal.PlatformDependent;

/**
 * Basic implementation of {@link Http2LocalFlowController}.
 * <p>
 * This class is <strong>NOT</strong> thread safe. The assumption is all methods must be invoked from a single thread.
 * Typically this thread is the event loop thread for the {@link ChannelHandlerContext} managed by this class.
 */
public class DefaultHttp2LocalFlowController implements Http2LocalFlowController {
    /**
     * The default ratio of window size to initial window size below which a {@code WINDOW_UPDATE}
     * is sent to expand the window.
     */
    public static final float DEFAULT_WINDOW_UPDATE_RATIO = 0.5f;

    private final Http2Connection connection;
    private final Http2Connection.PropertyKey stateKey;
    private Http2FrameWriter frameWriter;
    private ChannelHandlerContext ctx;
    private float windowUpdateRatio;
    private int initialWindowSize = DEFAULT_WINDOW_SIZE;

    public DefaultHttp2LocalFlowController(Http2Connection connection) {
        this(connection, DEFAULT_WINDOW_UPDATE_RATIO, false);
    }

    /**
// ... (587 more lines)