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annotate src/luan/modules/http/LuanHandler.java @ 1265:3f4644246e39

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LuanHandler cleanup and add Server.serve_for_proxy
author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 25 Sep 2018 19:51:34 -0600
parents d41997776788
children 9fa8b8389578
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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diff changeset
1 package luan.modules.http;
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2
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3 import java.io.Closeable;
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4 import java.io.Writer;
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5 import java.io.PrintWriter;
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6 import java.io.IOException;
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7 import java.lang.ref.Reference;
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8 import java.lang.ref.WeakReference;
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9 import java.lang.reflect.Method;
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10 import java.net.BindException;
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11 import java.util.List;
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12 import java.util.ArrayList;
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13 import java.util.concurrent.locks.ReadWriteLock;
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14 import java.util.concurrent.locks.ReentrantReadWriteLock;
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15 import org.slf4j.Logger;
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16 import org.slf4j.LoggerFactory;
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17 import luan.webserver.Request;
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18 import luan.webserver.Response;
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19 import luan.webserver.Status;
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20 import luan.webserver.Server;
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21 import luan.webserver.Handler;
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22 import luan.webserver.ResponseOutputStream;
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23 import luan.Luan;
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24 import luan.LuanState;
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25 import luan.LuanTable;
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26 import luan.LuanFunction;
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27 import luan.LuanJavaFunction;
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28 import luan.LuanCloner;
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29 import luan.LuanException;
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30 import luan.modules.PackageLuan;
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31 import luan.modules.BasicLuan;
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33
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34 public final class LuanHandler implements Handler, LuanState.OnClose {
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35 private final LuanState luanInit;
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36 private final Logger logger;
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37 private final ReadWriteLock lock = new ReentrantReadWriteLock();
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38 private final List<Reference<Closeable>> onClose = new ArrayList<Reference<Closeable>>();
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39 private volatile LuanState currentLuan;
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40
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41 private static final Method resetLuanMethod;
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42 private static final Method evalInRootMethod;
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43 static {
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44 try {
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45 resetLuanMethod = LuanHandler.class.getMethod( "reset_luan" );
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46 evalInRootMethod = LuanHandler.class.getMethod( "eval_in_root", String.class );
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47 } catch(NoSuchMethodException e) {
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48 throw new RuntimeException(e);
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49 }
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50 }
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51
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52 public LuanHandler(LuanState luanInit,String loggerRoot) {
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53 this.luanInit = luanInit;
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54 if( loggerRoot==null )
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55 loggerRoot = "";
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56 logger = LoggerFactory.getLogger(loggerRoot+LuanHandler.class.getName());
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57 try {
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58 LuanTable Http = (LuanTable)PackageLuan.require(luanInit,"luan:http/Http.luan");
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59 Http.rawPut( "reset_luan", new LuanJavaFunction(resetLuanMethod,this) );
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60 Http.rawPut( "eval_in_root", new LuanJavaFunction(evalInRootMethod,this) );
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61 } catch(LuanException e) {
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62 throw new RuntimeException(e);
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63 }
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64 currentLuan = newLuan();
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65 }
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66
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67 private LuanState newLuan() {
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68 LuanCloner cloner = new LuanCloner(LuanCloner.Type.COMPLETE);
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69 LuanState luan = (LuanState)cloner.clone(luanInit);
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70 luan.onClose = this;
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71 try {
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72 PackageLuan.load(luan,"site:/init.luan");
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73 } catch(LuanException e) {
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74 String err = e.getLuanStackTraceString();
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75 logger.error(err);
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76 }
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77 return luan;
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78 }
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79
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80 /*
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81 public LuanState getLuan() {
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82 return luan;
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83 }
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84 */
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85 @Override public Response handle(Request request) {
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86 if( request.path.endsWith("/") )
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87 return null;
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88 String modName = "site:" + request.path +".luan";
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89 return handle(request,modName);
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90 }
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91
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92 Response handle(Request request,String modName) {
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93 Thread thread = Thread.currentThread();
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94 String oldName = thread.getName();
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95 thread.setName(request.headers.get("host")+request.path);
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96 lock.readLock().lock();
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97 try {
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98 return HttpServicer.service(currentLuan,request,modName);
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99 } catch(LuanException e) {
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100 String err = e.getLuanStackTraceString();
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101 logger.error(err+"\n"+request.rawHead.trim()+"\n");
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102 String msg = "Internel Server Error\n\n" + err;
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103 return Response.errorResponse( Status.INTERNAL_SERVER_ERROR, msg );
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104 } finally {
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105 lock.readLock().unlock();
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106 thread.setName(oldName);
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107 }
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108 }
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109
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110 public void onClose(Closeable c) {
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111 synchronized(onClose) {
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112 onClose.add(new WeakReference<Closeable>(c));
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113 }
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114 }
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115
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116 public void close() {
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117 synchronized(onClose) {
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118 for( Reference<Closeable> ref : onClose ) {
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119 Closeable c = ref.get();
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120 if( c != null ) {
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121 try {
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122 c.close();
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123 } catch(IOException e) {
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124 logger.error(c.toString(),e);
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125 }
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126 }
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127 }
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128 onClose.clear();
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129 }
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130 }
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131
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132 public Object call_rpc(String fnName,Object... args) throws LuanException {
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133 lock.readLock().lock();
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134 try {
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135 LuanFunction fn;
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136 LuanState luan = currentLuan;
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137 synchronized(luan) {
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138 PackageLuan.enableLoad(luan,"luan:Rpc.luan");
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139 LuanTable rpc = (LuanTable)PackageLuan.require(luan,"luan:Rpc.luan");
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140 LuanTable fns = (LuanTable)rpc.get(luan,"functions");
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141 fn = (LuanFunction)fns.get(luan,fnName);
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142 if( fn == null )
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143 throw new LuanException( "function not found: " + fnName );
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144 LuanCloner cloner = new LuanCloner(LuanCloner.Type.INCREMENTAL);
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145 luan = (LuanState)cloner.clone(luan);
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146 fn = (LuanFunction)cloner.get(fn);
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147 }
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148 return fn.call(luan,args);
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149 } finally {
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150 lock.readLock().unlock();
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151 }
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152 }
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153
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154 public void reset_luan() {
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155 new Thread() {
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156 public void run() {
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157 lock.writeLock().lock();
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158 try {
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159 close();
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160 currentLuan = newLuan();
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161 } finally {
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162 lock.writeLock().unlock();
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163 }
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164 }
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165 }.start();
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166 }
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167
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168 public Object runLuan(String sourceText,String sourceName) throws LuanException {
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169 lock.readLock().lock();
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170 try {
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171 LuanFunction fn = Luan.load(sourceText,sourceName);
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172 LuanState luan = currentLuan;
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173 synchronized(luan) {
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174 LuanCloner cloner = new LuanCloner(LuanCloner.Type.INCREMENTAL);
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175 LuanState luan2 = (LuanState)cloner.clone(luan);
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176 return fn.call(luan2);
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177 }
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178 } finally {
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179 lock.readLock().unlock();
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180 }
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181 }
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182
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183 public void eval_in_root(String text) throws LuanException {
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184 LuanState oldLuan = currentLuan;
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185 LuanState luan;
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186 synchronized(oldLuan) {
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187 LuanCloner cloner = new LuanCloner(LuanCloner.Type.COMPLETE);
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188 luan = (LuanState)cloner.clone(oldLuan);
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189 }
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190 luan.onClose = this;
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191 BasicLuan.load(text,"<eval_in_root>",null).call(luan);
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192 currentLuan = luan;
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193 }
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194
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195 public static void start(Server server) throws Exception {
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196 try {
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197 server.start();
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198 } catch(BindException e) {
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199 throw new LuanException(e.toString());
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200 }
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201 }
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202
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203 }