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annotate c1x4hotspotsrc/HotSpotVM/src/com/sun/hotspot/c1x/server/ReplacingStreams.java @ 2288:8c426c2891c8

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client/server: new interface Remote marks classes that should not be serialized, but called remotely
author Lukas Stadler <lukas.stadler@jku.at>
date Mon, 11 Apr 2011 10:37:24 +0200
parents 762de4b26788
children 160aacf936ad
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1 /*
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2 * Copyright (c) 2011 Sun Microsystems, Inc. All rights reserved.
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3 *
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4 * Sun Microsystems, Inc. has intellectual property rights relating to technology embodied in the product
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5 * that is described in this document. In particular, and without limitation, these intellectual property
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6 * rights may include one or more of the U.S. patents listed at http://www.sun.com/patents and one or
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7 * more additional patents or pending patent applications in the U.S. and in other countries.
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8 *
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9 * U.S. Government Rights - Commercial software. Government users are subject to the Sun
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10 * Microsystems, Inc. standard license agreement and applicable provisions of the FAR and its
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11 * supplements.
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12 *
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13 * Use is subject to license terms. Sun, Sun Microsystems, the Sun logo, Java and Solaris are trademarks or
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14 * registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries. All SPARC trademarks
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15 * are used under license and are trademarks or registered trademarks of SPARC International, Inc. in the
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16 * U.S. and other countries.
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17 *
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18 * UNIX is a registered trademark in the U.S. and other countries, exclusively licensed through X/Open
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19 * Company, Ltd.
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20 */
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21 package com.sun.hotspot.c1x.server;
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22
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23 import java.io.*;
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24 import java.lang.reflect.*;
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25 import java.util.*;
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26
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27 import com.sun.cri.ci.*;
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28 import com.sun.hotspot.c1x.*;
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29 import com.sun.hotspot.c1x.Compiler;
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30
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31 public class ReplacingStreams {
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32
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33 private IdentityHashMap<Object, Placeholder> objectMap = new IdentityHashMap<Object, Placeholder>();
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34 private ArrayList<Object> objectList = new ArrayList<Object>();
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35
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36 private ReplacingOutputStream output;
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37 private ReplacingInputStream input;
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38
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39 private InvocationSocket invocation;
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40
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41 public ReplacingStreams(OutputStream outputStream, InputStream inputStream) throws IOException {
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42 output = new ReplacingOutputStream(new BufferedOutputStream(outputStream));
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43 // required, because creating an ObjectOutputStream writes a header, but doesn't flush the stream
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44 output.flush();
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45 input = new ReplacingInputStream(new BufferedInputStream(inputStream));
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46 invocation = new InvocationSocket(output, input);
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47
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48 addStaticObject(CiValue.IllegalValue);
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49 }
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50
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51 public void setInvocationSocket(InvocationSocket invocation) {
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52 this.invocation = invocation;
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53 }
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54
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55 public ReplacingOutputStream getOutput() {
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56 return output;
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57 }
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58
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59 public ReplacingInputStream getInput() {
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60 return input;
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61 }
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62
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63 public InvocationSocket getInvocation() {
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64 return invocation;
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65 }
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66
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67 private void addStaticObject(Object obj) {
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68 int id = objectList.size();
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69 objectList.add(obj);
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70 objectMap.put(obj, new Placeholder(id));
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71 }
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72
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73 public static class Placeholder implements Serializable {
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74
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75 public final int id;
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76
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77 public Placeholder(int id) {
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78 this.id = id;
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79 }
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80
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81 @Override
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82 public String toString() {
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83 return "#<" + id + ">";
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84 }
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85 }
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86
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87 public static class NewRemoteCallPlaceholder implements Serializable {
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88
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89 public final Class<?>[] interfaces;
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90
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91 public NewRemoteCallPlaceholder(Class<?>[] interfaces) {
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92 this.interfaces = interfaces;
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93 }
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94 }
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95
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96 public static class NewDummyPlaceholder implements Serializable {
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97 }
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98
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99 /**
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100 * Replaces certain cir objects that cannot easily be made Serializable.
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101 */
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102 public class ReplacingInputStream extends ObjectInputStream {
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103
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104 private Compiler compiler;
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105
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106 public ReplacingInputStream(InputStream in) throws IOException {
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107 super(in);
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108 enableResolveObject(true);
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109 }
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110
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111 public void setCompiler(Compiler compiler) {
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112 this.compiler = compiler;
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113 }
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114
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115 @Override
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116 protected Object resolveObject(Object obj) throws IOException {
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117 // see ReplacingInputStream.replaceObject for details on when these types of objects are created
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118
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119 if (obj instanceof Placeholder) {
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120 Placeholder placeholder = (Placeholder) obj;
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121 obj = objectList.get(placeholder.id);
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122 return obj;
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123 }
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124
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125 if (obj instanceof NewRemoteCallPlaceholder) {
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126 NewRemoteCallPlaceholder newPlaceholder = (NewRemoteCallPlaceholder) obj;
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127 Placeholder placeholder = new Placeholder(objectList.size());
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128 obj = Proxy.newProxyInstance(getClass().getClassLoader(), newPlaceholder.interfaces, invocation.new Handler(placeholder));
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129 objectMap.put(obj, placeholder);
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130 objectList.add(obj);
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131 return obj;
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132 }
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133
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134 if (obj instanceof NewDummyPlaceholder) {
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135 obj = new Placeholder(objectList.size());
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136 objectMap.put(obj, (Placeholder) obj);
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137 objectList.add(obj);
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138 return obj;
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139 }
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140
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141 return obj;
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142 }
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143 }
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144
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145 /**
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146 * Replaces certain cir objects that cannot easily be made Serializable.
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147 */
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148 public class ReplacingOutputStream extends ObjectOutputStream {
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149
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150 public ReplacingOutputStream(OutputStream out) throws IOException {
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151 super(out);
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152 enableReplaceObject(true);
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153 }
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154
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155 @Override
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156 protected Object replaceObject(Object obj) throws IOException {
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157 // is the object a known instance?
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158 Placeholder placeholder = objectMap.get(obj);
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159 if (placeholder != null) {
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160 return placeholder;
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161 }
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162
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163 // is the object an instance of a class that will always be executed remotely?
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164 if (obj instanceof Remote) {
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165 return createRemoteCallPlaceholder(obj);
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166 }
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167
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168 // is the object a constant of object type?
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169 if (obj.getClass() == CiConstant.class) {
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170 System.out.println("CiConstant " + obj);
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171 CiConstant constant = (CiConstant) obj;
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172 // don't replace if the object already is a placeholder
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173 if (constant.kind == CiKind.Object && !(constant.asObject() instanceof Placeholder) && constant.asObject() != null) {
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174 return CiConstant.forObject(createDummyPlaceholder(constant.asObject()));
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175 }
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176 }
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177 return obj;
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178 }
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179 }
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180
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181 public static Class<?>[] getAllInterfaces(Class<?> clazz) {
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182 HashSet<Class< ? >> interfaces = new HashSet<Class<?>>();
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183 getAllInterfaces(clazz, interfaces);
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184 return interfaces.toArray(new Class<?>[interfaces.size()]);
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185 }
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186
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187 private static void getAllInterfaces(Class<?> clazz, HashSet<Class<?>> interfaces) {
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188 for (Class< ? > iface : clazz.getInterfaces()) {
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189 if (!interfaces.contains(iface)) {
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190 interfaces.add(iface);
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191 getAllInterfaces(iface, interfaces);
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192 }
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193 }
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194 if (clazz.getSuperclass() != null) {
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195 getAllInterfaces(clazz.getSuperclass(), interfaces);
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196 }
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197 }
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198
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199 private Object createRemoteCallPlaceholder(Object obj) {
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200 // collect all interfaces that this object's class implements (proxies only support interfaces)
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201 objectMap.put(obj, new Placeholder(objectList.size()));
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202 objectList.add(obj);
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203 return new NewRemoteCallPlaceholder(getAllInterfaces(obj.getClass()));
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204 }
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205
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206 public Object createDummyPlaceholder(Object obj) {
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207 objectMap.put(obj, new Placeholder(objectList.size()));
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208 objectList.add(obj);
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209 return new NewDummyPlaceholder();
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210 }
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211 }