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1   /*
2    * Copyright 2014 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License, version 2.0 (the
5    * "License"); you may not use this file except in compliance with the License. You may obtain a
6    * copy of the License at:
7    *
8    * https://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software distributed under the License
11   * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
12   * or implied. See the License for the specific language governing permissions and limitations under
13   * the License.
14   */
15  package io.netty.handler.codec.http2;
16  
17  import io.netty.util.internal.UnstableApi;
18  
19  @UnstableApi
20  public interface Http2FrameSizePolicy {
21      /**
22       * Sets the maximum allowed frame size. Attempts to write frames longer than this maximum will fail.
23       * <p>
24       * This value is used to represent
25       * <a href="https://tools.ietf.org/html/rfc7540#section-6.5.2">SETTINGS_MAX_FRAME_SIZE</a>. This method should
26       * only be called by Netty (not users) as a result of a receiving a {@code SETTINGS} frame.
27       */
28      void maxFrameSize(int max) throws Http2Exception;
29  
30      /**
31       * Gets the maximum allowed frame size.
32       * <p>
33       * This value is used to represent
34       * <a href="https://tools.ietf.org/html/rfc7540#section-6.5.2">SETTINGS_MAX_FRAME_SIZE</a>. The initial value
35       * defined by the RFC is unlimited but enforcing a lower limit is generally permitted.
36       * {@link Http2CodecUtil#DEFAULT_MAX_FRAME_SIZE} can be used as a more conservative default.
37       */
38      int maxFrameSize();
39  }