RecvByteBufAllocator.java — netty Source File

Source Code

/*
 * Copyright 2012 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.channel;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.util.UncheckedBooleanSupplier;
import io.netty.util.internal.UnstableApi;

import static io.netty.util.internal.ObjectUtil.checkNotNull;

/**
 * Allocates a new receive buffer whose capacity is probably large enough to read all inbound data and small enough
 * not to waste its space.
 */
public interface RecvByteBufAllocator {
    /**
     * Creates a new handle.  The handle provides the actual operations and keeps the internal information which is
     * required for predicting an optimal buffer capacity.
     */
    Handle newHandle();

    /**
     * @deprecated Use {@link ExtendedHandle}.
     */
    @Deprecated
    interface Handle {
        /**
         * Creates a new receive buffer whose capacity is probably large enough to read all inbound data and small
         * enough not to waste its space.
         */
        ByteBuf allocate(ByteBufAllocator alloc);

        /**
         * Similar to {@link #allocate(ByteBufAllocator)} except that it does not allocate anything but just tells the
         * capacity.
         */
        int guess();

        /**
         * Reset any counters that have accumulated and recommend how many messages/bytes should be read for the next
         * read loop.
         * <p>
         * This may be used by {@link #continueReading()} to determine if the read operation should complete.
         * </p>
         * This is only ever a hint and may be ignored by the implementation.
         * @param config The channel configuration which may impact this object's behavior.
// ... (128 more lines)