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annotate src/luan/modules/http/LuanHandler.java @ 1333:25746915a241

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merge Luan and LuanState
author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 12 Feb 2019 22:33:40 -0700
parents 11b7e11f9ed5
children e0cf0d108a77
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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.LuanTable;
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24 import luan.LuanFunction;
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25 import luan.LuanJavaFunction;
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26 import luan.LuanCloner;
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27 import luan.LuanException;
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28 import luan.modules.PackageLuan;
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29 import luan.modules.BasicLuan;
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30 import luan.modules.logging.LuanLogger;
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32
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33 public final class LuanHandler implements Handler, Luan.OnClose {
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34 private final Luan luanInit;
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35 private final Logger logger;
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36 private final ReadWriteLock lock = new ReentrantReadWriteLock();
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37 private final List<Reference<Closeable>> onClose = new ArrayList<Reference<Closeable>>();
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38 private volatile Luan currentLuan;
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39 private volatile boolean isDisabled = false;
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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 private static final Method disableLuanMethod;
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44 static {
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45 try {
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46 resetLuanMethod = LuanHandler.class.getMethod( "reset_luan" );
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47 evalInRootMethod = LuanHandler.class.getMethod( "eval_in_root", String.class );
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48 disableLuanMethod = LuanHandler.class.getMethod( "disable_luan" );
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49 } catch(NoSuchMethodException e) {
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50 throw new RuntimeException(e);
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51 }
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52 }
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53
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54 public LuanHandler(Luan luanInit) {
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55 this.luanInit = luanInit;
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56 this.logger = LuanLogger.getLogger(luanInit,LuanHandler.class.getName());
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57 try {
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58 LuanTable Http = (LuanTable)luanInit.require("luan:http/Http.luan");
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59 Http.put( "reset_luan", new LuanJavaFunction(resetLuanMethod,this) );
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60 Http.put( "eval_in_root", new LuanJavaFunction(evalInRootMethod,this) );
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61 Http.put( "disable_luan", new LuanJavaFunction(disableLuanMethod,this) );
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62 } catch(LuanException e) {
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63 throw new RuntimeException(e);
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64 }
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65 currentLuan = newLuan();
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66 }
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67
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68 private Luan newLuan() {
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69 LuanCloner cloner = new LuanCloner(LuanCloner.Type.COMPLETE);
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70 Luan luan = (Luan)cloner.clone(luanInit);
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71 luan.onClose = this;
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72 try {
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73 PackageLuan.load(luan,"site:/init.luan");
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74 } catch(LuanException e) {
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75 //e.printStackTrace();
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76 String err = e.getLuanStackTraceString();
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77 logger.error(err);
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78 }
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79 return luan;
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80 }
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81
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82 /*
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83 public Luan getLuan() {
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84 return luan;
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85 }
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86 */
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87 @Override public Response handle(Request request) {
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88 if( isDisabled )
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89 return null;
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90 if( request.path.endsWith("/") )
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91 return null;
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92 String modName = "site:" + request.path +".luan";
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93 return handle(request,modName);
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94 }
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95
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96 Response handle(Request request,String modName) {
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97 Thread thread = Thread.currentThread();
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98 String oldName = thread.getName();
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99 thread.setName(request.headers.get("host")+request.path);
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100 lock.readLock().lock();
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101 try {
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102 return HttpServicer.service(currentLuan,request,modName);
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103 } catch(LuanException e) {
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104 String err = e.getLuanStackTraceString();
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105 logger.error(err+"\n"+request.rawHead.trim()+"\n");
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106 String msg = "Internel Server Error\n\n" + err;
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107 return Response.errorResponse( Status.INTERNAL_SERVER_ERROR, msg );
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108 } finally {
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109 lock.readLock().unlock();
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110 thread.setName(oldName);
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111 }
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112 }
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113
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114 public void onClose(Closeable c) {
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115 synchronized(onClose) {
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116 onClose.add(new WeakReference<Closeable>(c));
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117 }
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118 }
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119
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120 public void close() {
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121 synchronized(onClose) {
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122 for( Reference<Closeable> ref : onClose ) {
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123 Closeable c = ref.get();
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124 if( c != null ) {
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125 try {
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126 c.close();
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127 } catch(IOException e) {
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128 logger.error(c.toString(),e);
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129 }
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130 }
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131 }
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132 onClose.clear();
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133 }
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134 }
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135
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136 public Object call_rpc(String fnName,Object... args) throws LuanException {
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137 lock.readLock().lock();
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138 try {
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139 LuanFunction fn;
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140 Luan luan = currentLuan;
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141 synchronized(luan) {
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142 PackageLuan.enableLoad(luan,"luan:Rpc.luan");
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143 LuanTable rpc = (LuanTable)luan.require("luan:Rpc.luan");
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144 LuanTable fns = (LuanTable)rpc.get("functions");
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145 fn = (LuanFunction)fns.get(fnName);
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146 if( fn == null )
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147 throw new LuanException( "function not found: " + fnName );
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148 LuanCloner cloner = new LuanCloner(LuanCloner.Type.INCREMENTAL);
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149 luan = (Luan)cloner.clone(luan);
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150 fn = (LuanFunction)cloner.get(fn);
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151 }
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152 return fn.call(luan,args);
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153 } finally {
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154 lock.readLock().unlock();
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155 }
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156 }
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157
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158 public void reset_luan() {
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159 new Thread() {
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160 public void run() {
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161 lock.writeLock().lock();
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162 try {
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163 close();
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164 currentLuan = newLuan();
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165 } finally {
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166 lock.writeLock().unlock();
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167 }
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168 }
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169 }.start();
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170 }
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171
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172 public void disable_luan() {
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173 isDisabled = true;
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174 }
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175
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176 public Object runLuan(String sourceText,String sourceName) throws LuanException {
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177 lock.readLock().lock();
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178 try {
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179 LuanFunction fn = Luan.load(sourceText,sourceName);
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180 Luan luan = currentLuan;
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181 synchronized(luan) {
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182 LuanCloner cloner = new LuanCloner(LuanCloner.Type.INCREMENTAL);
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183 Luan luan2 = (Luan)cloner.clone(luan);
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184 return fn.call(luan2);
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185 }
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186 } finally {
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187 lock.readLock().unlock();
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188 }
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189 }
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190
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191 public void eval_in_root(String text) throws LuanException {
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192 Luan oldLuan = currentLuan;
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193 Luan luan;
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194 synchronized(oldLuan) {
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195 LuanCloner cloner = new LuanCloner(LuanCloner.Type.COMPLETE);
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196 luan = (Luan)cloner.clone(oldLuan);
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197 }
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198 luan.onClose = this;
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199 BasicLuan.load(text,"<eval_in_root>",null).call(luan);
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200 currentLuan = luan;
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201 }
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202
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203 public static void start(Server server) throws Exception {
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204 try {
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205 server.start();
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206 } catch(BindException e) {
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207 throw new LuanException(e.toString());
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208 }
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209 }
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210
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211 }