1 /* |
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2 * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package java.net.http; |
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27 |
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28 import java.io.IOException; |
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29 import java.nio.ByteBuffer; |
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30 |
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31 class SettingsFrame extends Http2Frame { |
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32 |
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33 int[] parameters; |
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34 |
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35 public static final int TYPE = 0x4; |
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36 |
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37 // Flags |
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38 public static final int ACK = 0x1; |
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39 |
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40 @Override |
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41 String flagAsString(int flag) { |
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42 switch (flag) { |
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43 case ACK: |
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44 return "ACK"; |
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45 } |
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46 return super.flagAsString(flag); |
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47 } |
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48 |
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49 @Override |
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50 public String toString() { |
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51 StringBuilder sb = new StringBuilder(); |
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52 sb.append(super.toString()) |
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53 .append(" Settings: "); |
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54 |
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55 for (int i = 0; i < MAX_PARAM; i++) { |
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56 if (parameters[i] != -1) { |
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57 sb.append(name(i)) |
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58 .append("=") |
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59 .append(Integer.toString(parameters[i])) |
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60 .append(' '); |
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61 } |
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62 } |
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63 return sb.toString(); |
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64 } |
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65 |
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66 // Parameters |
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67 public static final int HEADER_TABLE_SIZE = 0x1; |
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68 public static final int ENABLE_PUSH = 0x2; |
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69 public static final int MAX_CONCURRENT_STREAMS = 0x3; |
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70 public static final int INITIAL_WINDOW_SIZE = 0x4; |
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71 public static final int MAX_FRAME_SIZE = 0x5; |
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72 public static final int MAX_HEADER_LIST_SIZE = 0x6; |
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73 |
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74 private String name(int i) { |
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75 switch (i+1) { |
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76 case HEADER_TABLE_SIZE: |
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77 return "HEADER_TABLE_SIZE"; |
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78 case ENABLE_PUSH: |
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79 return "ENABLE_PUSH"; |
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80 case MAX_CONCURRENT_STREAMS: |
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81 return "MAX_CONCURRENT_STREAMS"; |
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82 case INITIAL_WINDOW_SIZE: |
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83 return "INITIAL_WINDOW_SIZE"; |
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84 case MAX_FRAME_SIZE: |
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85 return "MAX_FRAME_SIZE"; |
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86 case MAX_HEADER_LIST_SIZE: |
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87 return "MAX_HEADER_LIST_SIZE"; |
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88 } |
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89 return "unknown parameter"; |
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90 } |
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91 public static final int MAX_PARAM = 0x6; |
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92 |
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93 public SettingsFrame() { |
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94 type = TYPE; |
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95 parameters = new int [MAX_PARAM]; |
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96 for (int i=0; i < parameters.length; i++) { |
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97 parameters[i] = -1; |
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98 } |
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99 } |
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100 |
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101 public int getParameter(int paramID) { |
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102 if (paramID > MAX_PARAM) { |
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103 throw new IllegalArgumentException("illegal parameter"); |
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104 } |
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105 return parameters[paramID-1]; |
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106 } |
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107 |
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108 public SettingsFrame setParameter(int paramID, int value) { |
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109 if (paramID > MAX_PARAM) { |
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110 throw new IllegalArgumentException("illegal parameter"); |
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111 } |
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112 parameters[paramID-1] = value; |
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113 return this; |
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114 } |
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115 |
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116 @Override |
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117 void readIncomingImpl(ByteBufferConsumer bc) throws IOException { |
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118 if (length % 6 != 0) { |
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119 throw new IOException("Protocol error: invalid settings frame"); |
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120 } |
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121 int n = length / 6; |
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122 for (int i=0; i<n; i++) { |
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123 int id = bc.getShort(); |
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124 int val = bc.getInt(); |
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125 if (id > 0 || id <= MAX_PARAM) { |
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126 // a known parameter. Ignore otherwise |
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127 parameters[id-1] = val; |
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128 } |
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129 } |
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130 } |
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131 |
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132 @Override |
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133 void computeLength() { |
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134 length = 0; |
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135 for (int i : parameters) { |
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136 if (i != -1) { |
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137 length += 6; |
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138 } |
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139 } |
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140 } |
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141 |
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142 @Override |
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143 void writeOutgoing(ByteBufferGenerator bg) { |
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144 super.writeOutgoing(bg); |
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145 ByteBuffer buf = bg.getBuffer(length); |
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146 for (int i = 0; i < MAX_PARAM; i++) { |
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147 if (parameters[i] != -1) { |
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148 buf.putShort((short)(i+1)); |
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149 buf.putInt(parameters[i]); |
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150 } |
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151 } |
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152 } |
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153 |
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154 private static final int K = 1024; |
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155 |
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156 public static SettingsFrame getDefaultSettings() { |
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157 SettingsFrame f = new SettingsFrame(); |
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158 // TODO: check these values |
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159 f.setParameter(ENABLE_PUSH, 1); |
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160 f.setParameter(HEADER_TABLE_SIZE, 4 * K); |
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161 f.setParameter(MAX_CONCURRENT_STREAMS, 35); |
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162 f.setParameter(INITIAL_WINDOW_SIZE, 16 * K); |
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163 f.setParameter(MAX_FRAME_SIZE, 16 * K); |
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164 return f; |
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165 } |
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166 } |
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