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annotate src/luan/modules/http/LuanHandler.java @ 1332:11b7e11f9ed5

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cleaner logging
author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 12 Feb 2019 21:50:26 -0700
parents 307e76ccd0d6
children 25746915a241
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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 luan.webserver.Request;
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17 import luan.webserver.Response;
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18 import luan.webserver.Status;
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19 import luan.webserver.Server;
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20 import luan.webserver.Handler;
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21 import luan.webserver.ResponseOutputStream;
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22 import luan.Luan;
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23 import luan.LuanState;
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24 import luan.LuanTable;
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25 import luan.LuanFunction;
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26 import luan.LuanJavaFunction;
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27 import luan.LuanCloner;
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28 import luan.LuanException;
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29 import luan.modules.PackageLuan;
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30 import luan.modules.BasicLuan;
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31 import luan.modules.logging.LuanLogger;
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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 private volatile boolean isDisabled = false;
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41
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42 private static final Method resetLuanMethod;
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43 private static final Method evalInRootMethod;
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44 private static final Method disableLuanMethod;
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45 static {
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46 try {
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47 resetLuanMethod = LuanHandler.class.getMethod( "reset_luan" );
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48 evalInRootMethod = LuanHandler.class.getMethod( "eval_in_root", String.class );
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49 disableLuanMethod = LuanHandler.class.getMethod( "disable_luan" );
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50 } catch(NoSuchMethodException e) {
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51 throw new RuntimeException(e);
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52 }
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53 }
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54
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55 public LuanHandler(LuanState luanInit) {
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56 this.luanInit = luanInit;
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57 this.logger = LuanLogger.getLogger(luanInit,LuanHandler.class.getName());
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58 try {
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59 LuanTable Http = (LuanTable)luanInit.require("luan:http/Http.luan");
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60 Http.put( "reset_luan", new LuanJavaFunction(resetLuanMethod,this) );
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61 Http.put( "eval_in_root", new LuanJavaFunction(evalInRootMethod,this) );
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62 Http.put( "disable_luan", new LuanJavaFunction(disableLuanMethod,this) );
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63 } catch(LuanException e) {
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64 throw new RuntimeException(e);
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65 }
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66 currentLuan = newLuan();
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67 }
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68
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69 private LuanState newLuan() {
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70 LuanCloner cloner = new LuanCloner(LuanCloner.Type.COMPLETE);
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71 LuanState luan = (LuanState)cloner.clone(luanInit);
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72 luan.onClose = this;
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73 try {
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74 PackageLuan.load(luan,"site:/init.luan");
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75 } catch(LuanException e) {
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76 //e.printStackTrace();
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77 String err = e.getLuanStackTraceString();
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78 logger.error(err);
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79 }
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80 return luan;
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81 }
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82
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83 /*
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84 public LuanState getLuan() {
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85 return luan;
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86 }
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87 */
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88 @Override public Response handle(Request request) {
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89 if( isDisabled )
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90 return null;
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91 if( request.path.endsWith("/") )
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92 return null;
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93 String modName = "site:" + request.path +".luan";
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94 return handle(request,modName);
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95 }
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96
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97 Response handle(Request request,String modName) {
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98 Thread thread = Thread.currentThread();
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99 String oldName = thread.getName();
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100 thread.setName(request.headers.get("host")+request.path);
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101 lock.readLock().lock();
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102 try {
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103 return HttpServicer.service(currentLuan,request,modName);
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104 } catch(LuanException e) {
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105 String err = e.getLuanStackTraceString();
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106 logger.error(err+"\n"+request.rawHead.trim()+"\n");
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107 String msg = "Internel Server Error\n\n" + err;
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108 return Response.errorResponse( Status.INTERNAL_SERVER_ERROR, msg );
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109 } finally {
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110 lock.readLock().unlock();
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111 thread.setName(oldName);
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112 }
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113 }
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114
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115 public void onClose(Closeable c) {
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116 synchronized(onClose) {
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117 onClose.add(new WeakReference<Closeable>(c));
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118 }
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119 }
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120
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121 public void close() {
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122 synchronized(onClose) {
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123 for( Reference<Closeable> ref : onClose ) {
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124 Closeable c = ref.get();
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125 if( c != null ) {
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126 try {
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127 c.close();
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128 } catch(IOException e) {
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129 logger.error(c.toString(),e);
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130 }
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131 }
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132 }
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133 onClose.clear();
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134 }
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135 }
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136
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137 public Object call_rpc(String fnName,Object... args) throws LuanException {
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138 lock.readLock().lock();
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139 try {
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140 LuanFunction fn;
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141 LuanState luan = currentLuan;
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142 synchronized(luan) {
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143 PackageLuan.enableLoad(luan,"luan:Rpc.luan");
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144 LuanTable rpc = (LuanTable)luan.require("luan:Rpc.luan");
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145 LuanTable fns = (LuanTable)rpc.get("functions");
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146 fn = (LuanFunction)fns.get(fnName);
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147 if( fn == null )
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148 throw new LuanException( "function not found: " + fnName );
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149 LuanCloner cloner = new LuanCloner(LuanCloner.Type.INCREMENTAL);
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150 luan = (LuanState)cloner.clone(luan);
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151 fn = (LuanFunction)cloner.get(fn);
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152 }
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153 return fn.call(luan,args);
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154 } finally {
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155 lock.readLock().unlock();
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156 }
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157 }
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158
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159 public void reset_luan() {
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160 new Thread() {
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161 public void run() {
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162 lock.writeLock().lock();
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163 try {
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164 close();
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165 currentLuan = newLuan();
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166 } finally {
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167 lock.writeLock().unlock();
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168 }
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169 }
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170 }.start();
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171 }
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172
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173 public void disable_luan() {
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174 isDisabled = true;
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175 }
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176
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177 public Object runLuan(String sourceText,String sourceName) throws LuanException {
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178 lock.readLock().lock();
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179 try {
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180 LuanFunction fn = Luan.load(sourceText,sourceName);
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181 LuanState luan = currentLuan;
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182 synchronized(luan) {
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183 LuanCloner cloner = new LuanCloner(LuanCloner.Type.INCREMENTAL);
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184 LuanState luan2 = (LuanState)cloner.clone(luan);
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185 return fn.call(luan2);
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186 }
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187 } finally {
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188 lock.readLock().unlock();
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189 }
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190 }
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191
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192 public void eval_in_root(String text) throws LuanException {
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193 LuanState oldLuan = currentLuan;
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194 LuanState luan;
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195 synchronized(oldLuan) {
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196 LuanCloner cloner = new LuanCloner(LuanCloner.Type.COMPLETE);
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197 luan = (LuanState)cloner.clone(oldLuan);
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198 }
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199 luan.onClose = this;
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200 BasicLuan.load(text,"<eval_in_root>",null).call(luan);
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201 currentLuan = luan;
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202 }
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203
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204 public static void start(Server server) throws Exception {
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205 try {
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206 server.start();
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207 } catch(BindException e) {
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208 throw new LuanException(e.toString());
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209 }
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210 }
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211
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212 }