1 /* |
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2 * Copyright (c) 2000, 2002, 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 com.sun.corba.se.impl.interceptors; |
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27 |
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28 import com.sun.corba.se.impl.corba.AnyImpl; |
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29 import org.omg.PortableInterceptor.Current; |
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30 import org.omg.PortableInterceptor.InvalidSlot; |
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31 |
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32 import com.sun.corba.se.impl.util.MinorCodes; |
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33 import com.sun.corba.se.impl.core.ORB; |
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34 |
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35 /** |
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36 * ThreadCurrentStack is the container of PICurrent instances for each thread |
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37 */ |
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38 public class ThreadCurrentStack |
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39 { |
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40 // PICurrentPool is the container for reusable PICurrents |
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41 private class PICurrentPool { |
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42 |
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43 // Contains a list of reusable PICurrents |
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44 private java.util.ArrayList pool; |
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45 |
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46 // High water mark for the pool |
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47 // If the pool size reaches this limit then putPICurrent will |
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48 // not put PICurrent to the pool. |
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49 private static final int HIGH_WATER_MARK = 5; |
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50 |
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51 // currentIndex points to the last PICurrent in the list |
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52 private int currentIndex; |
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53 |
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54 PICurrentPool( ) { |
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55 pool = new java.util.ArrayList( HIGH_WATER_MARK ); |
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56 currentIndex = 0; |
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57 } |
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58 |
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59 /** |
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60 * Puts PICurrent to the re-usable pool. |
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61 */ |
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62 void putPICurrent( PICurrent current ) { |
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63 // If there are enough PICurrents in the pool, then don't add |
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64 // this current to the pool. |
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65 if( currentIndex >= HIGH_WATER_MARK ) { |
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66 return; |
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67 } |
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68 pool.add(currentIndex , current); |
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69 currentIndex++; |
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70 } |
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71 |
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72 /** |
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73 * Gets PICurrent from the re-usable pool. |
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74 */ |
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75 PICurrent getPICurrent( ) { |
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76 // If there are no entries in the pool then return null |
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77 if( currentIndex == 0 ) { |
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78 return null; |
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79 } |
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80 // Works like a stack, Gets the last one added first |
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81 currentIndex--; |
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82 return (PICurrent) pool.get(currentIndex); |
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83 } |
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84 } |
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85 |
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86 // Contains all the active PICurrents for each thread. |
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87 // The ArrayList is made to behave like a stack. |
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88 private java.util.ArrayList currentContainer; |
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89 |
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90 // Keeps track of number of PICurrents in the stack. |
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91 private int currentIndex; |
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92 |
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93 // For Every Thread there will be a pool of re-usable ThreadCurrent's |
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94 // stored in PICurrentPool |
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95 private PICurrentPool currentPool; |
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96 |
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97 // The orb associated with this ThreadCurrentStack |
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98 private ORB piOrb; |
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99 |
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100 /** |
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101 * Constructs the stack and and PICurrentPool |
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102 */ |
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103 ThreadCurrentStack( ORB piOrb, PICurrent current ) { |
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104 this.piOrb = piOrb; |
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105 currentIndex = 0; |
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106 currentContainer = new java.util.ArrayList( ); |
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107 currentPool = new PICurrentPool( ); |
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108 currentContainer.add( currentIndex, current ); |
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109 currentIndex++; |
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110 } |
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111 |
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112 |
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113 /** |
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114 * pushPICurrent goes through the following steps |
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115 * 1: Checks to see if there is any PICurrent in PICurrentPool |
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116 * If present then use that instance to push into the ThreadCurrentStack |
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117 * |
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118 * 2:If there is no PICurrent in the pool, then creates a new one and pushes |
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119 * that into the ThreadCurrentStack |
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120 */ |
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121 void pushPICurrent( ) { |
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122 PICurrent current = currentPool.getPICurrent( ); |
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123 if( current == null ) { |
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124 // get an existing PICurrent to get the slotSize |
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125 PICurrent currentTemp = peekPICurrent(); |
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126 current = new PICurrent( piOrb, currentTemp.getSlotSize( )); |
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127 } |
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128 currentContainer.add( currentIndex, current ); |
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129 currentIndex++; |
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130 } |
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131 |
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132 /** |
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133 * popPICurrent does the following |
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134 * 1: pops the top PICurrent in the ThreadCurrentStack |
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135 * |
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136 * 2: resets the slots in the PICurrent which resets the slotvalues to |
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137 * null if there are any previous sets. |
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138 * |
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139 * 3: pushes the reset PICurrent into the PICurrentPool to reuse |
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140 */ |
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141 void popPICurrent( ) { |
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142 // Do not pop the PICurrent, If there is only one. |
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143 // This should not happen, But an extra check for safety. |
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144 if( currentIndex <= 1 ) { |
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145 throw new org.omg.CORBA.INTERNAL( |
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146 "Cannot pop the only PICurrent in the stack", |
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147 MinorCodes.CANT_POP_ONLY_CURRENT_2, |
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148 CompletionStatus.COMPLETED_NO ); |
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149 } |
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150 currentIndex--; |
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151 PICurrent current = (PICurrent)currentContainer.get( currentIndex ); |
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152 current.resetSlots( ); |
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153 currentPool.putPICurrent( current ); |
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154 } |
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155 |
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156 /** |
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157 * peekPICurrent gets the top PICurrent in the ThreadCurrentStack without |
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158 * popping. |
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159 */ |
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160 PICurrent peekPICurrent( ) { |
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161 return (PICurrent) currentContainer.get( currentIndex - 1); |
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162 } |
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163 |
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164 } |
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