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annotate src/luan/modules/ThreadLuan.java @ 1420:225808b90cee

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options handling
author Franklin Schmidt <fschmidt@gmail.com>
date Sat, 26 Oct 2019 22:21:09 -0600
parents 5b8f76e26ab7
children 67bed466460e
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rev   line source
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diff changeset
1 package luan.modules;
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2
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3 import java.io.Closeable;
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4 import java.util.Arrays;
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5 import java.util.Iterator;
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6 import java.util.Map;
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7 import java.util.HashMap;
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8 import java.util.LinkedHashMap;
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9 import java.lang.ref.Reference;
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10 import java.lang.ref.WeakReference;
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11 import java.util.concurrent.Executor;
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12 import java.util.concurrent.Executors;
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13 import java.util.concurrent.ScheduledExecutorService;
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14 import java.util.concurrent.ScheduledFuture;
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15 import java.util.concurrent.TimeUnit;
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16 import java.util.concurrent.ConcurrentHashMap;
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17 import java.util.concurrent.locks.Lock;
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18 import java.util.concurrent.locks.ReadWriteLock;
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19 import java.util.concurrent.locks.ReentrantLock;
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20 import java.util.concurrent.locks.ReentrantReadWriteLock;
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21 import luan.Luan;
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22 import luan.LuanFunction;
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23 import luan.LuanTable;
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24 import luan.LuanException;
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25 import luan.LuanCloner;
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26 import luan.LuanCloneable;
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27 import goodjava.logging.Logger;
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28 import goodjava.logging.LoggerFactory;
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29
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30
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31 public final class ThreadLuan {
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32 private static final Logger logger = LoggerFactory.getLogger(ThreadLuan.class);
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33
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34 private static final Executor exec = Executors.newCachedThreadPool();
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35 public static final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
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36
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37 private static Runnable runnable(final LuanFunction fn) {
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38 return new Runnable() {
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39 public synchronized void run() {
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40 try {
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41 fn.call();
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42 } catch(LuanException e) {
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43 e.printStackTrace();
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44 }
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45 }
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46 };
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47 }
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48
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49 public static void fork(LuanFunction fn) {
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50 LuanCloner cloner = new LuanCloner(LuanCloner.Type.COMPLETE);
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51 final LuanFunction newFn = (LuanFunction)cloner.get(fn);
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52 exec.execute(runnable(newFn));
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53 }
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54
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55 private static Map<String,Reference<ScheduledFuture>> scheduleds = new ConcurrentHashMap<String,Reference<ScheduledFuture>>();
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56
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57 public static void schedule(LuanFunction fn,LuanTable options)
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58 throws LuanException
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59 {
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60 options = new LuanTable(options);
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61 Number delay = Utils.removeNumber(options,"delay");
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62 Number repeatingDelay = Utils.removeNumber(options,"repeating_delay");
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63 Number repeatingRate = Utils.removeNumber(options,"repeating_rate");
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64 String id = Utils.removeString(options,"id");
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65 if( repeatingDelay!=null && repeatingRate!=null )
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66 throw new LuanException("can't define both repeating_delay and repeating_rate");
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67 boolean repeating = repeatingDelay!=null || repeatingRate!=null;
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68 Utils.checkEmpty(options);
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69 if( id != null ) {
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70 Reference<ScheduledFuture> ref = scheduleds.remove(id);
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71 if( ref != null ) {
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72 ScheduledFuture sf = ref.get();
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73 if( sf != null )
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74 sf.cancel(false);
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75 }
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76 }
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77 Luan luan = fn.luan();
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78 LuanCloner cloner = new LuanCloner(LuanCloner.Type.COMPLETE);
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79 final Luan newLuan = (Luan)cloner.clone(luan);
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80 final LuanFunction newFn = (LuanFunction)cloner.get(fn);
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81 final Runnable r = runnable(newFn);
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82 final ScheduledFuture sf;
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83 if( repeatingDelay != null ) {
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84 if( delay==null )
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85 delay = repeatingDelay;
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86 sf = scheduler.scheduleWithFixedDelay(r,delay.longValue(),repeatingDelay.longValue(),TimeUnit.MILLISECONDS);
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87 } else if( repeatingRate != null ) {
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88 if( delay==null )
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89 delay = repeatingRate;
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90 sf = scheduler.scheduleWithFixedDelay(r,delay.longValue(),repeatingRate.longValue(),TimeUnit.MILLISECONDS);
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91 } else if( delay != null ) {
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92 sf = scheduler.schedule(r,delay.longValue(),TimeUnit.MILLISECONDS);
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93 } else {
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94 scheduler.schedule(r,0L,TimeUnit.MILLISECONDS);
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95 return;
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96 }
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97 Object c = new Object() {
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98 protected void finalize() throws Throwable {
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99 sf.cancel(false);
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100 }
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101 };
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102 luan.registry().put(c,c); // cancel on gc
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103 if( id != null )
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104 scheduleds.put(id,new WeakReference<ScheduledFuture>(sf));
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105 }
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106
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107 /*
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108 public static class GlobalMap {
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109
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110 private static class Value {
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111 final long time = System.currentTimeMillis();
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112 final Object v;
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113
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114 Value(Object v) {
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115 this.v = v;
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116 }
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117 }
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118
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119 public long timeout = 60000L; // one minute
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120 private Map<String,Value> map = new LinkedHashMap<String,Value>() {
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121 protected boolean removeEldestEntry(Map.Entry<String,Value> eldest) {
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122 return eldest.getValue().time < System.currentTimeMillis() - timeout;
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123 }
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124 };
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125
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126 public synchronized Object get(String key) {
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127 Value val = map.get(key);
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128 return val==null ? null : val.v;
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129 }
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130
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131 public synchronized Object put(String key,Object v) throws LuanException {
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132 Value val;
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133 if( v == null ) {
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134 val = map.remove(key);
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135 } else {
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136 if( !(v instanceof String || v instanceof Boolean || v instanceof Number) )
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137 throw new LuanException("can't assign type "+Luan.type(v)+" to Thread.global");
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138 val = map.put(key,new Value(v));
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139 }
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140 return val==null ? null : val.v;
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141 }
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142 }
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143 */
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144
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145 public static void sleep(long millis) throws InterruptedException {
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146 Thread.sleep(millis);
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147 }
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148
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149
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150 private static class Unsafe {
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151 private final String reason;
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152
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153 Unsafe(String reason) {
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154 this.reason = reason;
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155 }
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156 }
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157
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158 private static Object makeSafe(Luan luan,Object v) throws LuanException {
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159 if( v instanceof LuanTable ) {
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160 LuanTable tbl = (LuanTable)v;
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161 if( tbl.getMetatable() != null )
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162 return new Unsafe("table with metatable");
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163 LuanTable rtn = new LuanTable(luan);
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164 for( Map.Entry entry : tbl.rawIterable() ) {
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165 Object key = makeSafe( luan, entry.getKey() );
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166 if( key instanceof Unsafe )
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167 return key;
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168 Object value = makeSafe( luan, entry.getValue() );
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169 if( value instanceof Unsafe )
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170 return value;
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171 rtn.rawPut(key,value);
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172 }
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173 return rtn;
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174 } else if( v instanceof Object[] ) {
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175 Object[] a = (Object[])v;
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176 for( int i=0; i<a.length; i++ ) {
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177 Object obj = makeSafe(luan,a[i]);
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178 if( obj instanceof Unsafe )
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179 return obj;
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180 a[i] = obj;
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181 }
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182 return a;
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183 } else {
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184 if( v instanceof LuanCloneable )
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185 return new Unsafe("type "+Luan.type(v));
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186 return v;
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187 }
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188 }
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189
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190 public static final class Callable {
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191 private long expires;
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192 private final Luan luan = new Luan();
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193 private final LuanTable fns;
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194
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195 Callable(LuanTable fns) {
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196 LuanCloner cloner = new LuanCloner(LuanCloner.Type.COMPLETE);
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197 this.fns = (LuanTable)cloner.get(fns);
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198 }
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199
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200 public synchronized Object call(Luan callerLuan,String fnName,Object... args) throws LuanException {
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201 Object obj = makeSafe(luan,args);
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202 if( obj instanceof Unsafe )
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203 throw new LuanException("can't pass "+((Unsafe)obj).reason+" to global_callable "+Arrays.asList(args));
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204 args = (Object[])obj;
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205 Object f = fns.get(fnName);
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206 if( f == null )
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207 throw new LuanException("function '"+fnName+"' not found in global_callable");
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208 if( !(f instanceof LuanFunction) )
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209 throw new LuanException("value of '"+fnName+"' not a function in global_callable");
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210 LuanFunction fn = (LuanFunction)f;
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211 Object rtn = fn.call(args);
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212 rtn = makeSafe(callerLuan,rtn);
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213 if( rtn instanceof Unsafe )
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214 throw new LuanException("can't return "+((Unsafe)rtn).reason+" from global_callable");
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215 return rtn;
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216 }
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217 }
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218
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219 private static Map<String,Callable> callableMap = new HashMap<String,Callable>();
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220
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221 private static void sweep() {
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222 long now = System.currentTimeMillis();
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223 for( Iterator<Callable> iter = callableMap.values().iterator(); iter.hasNext(); ) {
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224 Callable callable = iter.next();
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225 if( callable.expires < now )
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226 iter.remove();
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227 }
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228 }
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229
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230 public static synchronized Callable globalCallable(String name,LuanTable fns,long timeout) {
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231 Callable callable = callableMap.get(name);
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232 if( callable == null ) {
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233 sweep();
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234 callable = new Callable(fns);
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235 callableMap.put(name,callable);
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236 }
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237 callable.expires = System.currentTimeMillis() + timeout;
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238 return callable;
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239 }
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240
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241 public static synchronized void removeGlobalCallable(String name) {
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242 callableMap.remove(name);
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243 }
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244
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245
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246 public static void lock(Lock lock)
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247 throws LuanException, InterruptedException
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248 {
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249 if( !lock.tryLock(10,TimeUnit.MINUTES) )
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250 throw new LuanException("failed to acquire lock");
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251 }
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252
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253 public static Object runInLock(Lock lock,LuanFunction fn,Object... args)
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254 throws LuanException, InterruptedException
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255 {
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256 lock(lock);
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257 try {
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258 return fn.call(args);
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259 } finally {
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260 lock.unlock();
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261 }
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262 }
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263
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264 }