[英]Java for loop thread lock
我希望程序在模型中循環執行17次,但是如果我循環執行的次數超過5,則程序凍結了,我嘗試查找問題,這是因為edt無法執行繁重的任務,但是我嘗試在其中創建新線程解決該問題的代碼,但我似乎無法正確解決。
PS:程序可以正常工作,所以這不是實際程序的問題,它是循環(循環17次)。
public synchronized void start(int max) {
try {
// max = total number of questions
for (int i = 1; i < max; i++) {
//new cmd command
Process p = Runtime.getRuntime().exec("cmd");
// new thread
new Thread(() -> {
try (BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()))) {
String line;
while ((line = reader.readLine()) != null)
System.out.println(line);
}
catch (Exception e) {
e.printStackTrace();
}
}).start();
//used to change text in files and the remaining cmd commands and move the result
try (PrintStream out = new PrintStream(p.getOutputStream())) {
//to clear previous index folder and delete results folder
deleteFile();
//to rewrite the "collection.spec" folder with the address of the Answers file
answerFile(i);
//to rewrite the "trec.topics.list"" folder with the address of the Questions file
questionFile(i);
/* PROBLEM STARTS HERE! */
for(int c = 1; c <= 17; c++) {
// after rename do the remaining cmd commands
out.println("C:/TERRIERS/terrier/bin/trec_terrier.bat -i");
out.println("C:/TERRIERS/terrier/bin/trec_terrier.bat -r");
//change model
modelSelect();
}
/* PROBLEM ENDS HERE!*/
// .....
}
p.waitFor();
//move the ".res" folder to the Results folder in projects directory
takeFile(i);
}
}
catch(IOException ex) {
}
catch(InterruptedException ex) {
}
}
這是modelSelect函數
int counter = 1;
public void modelSelect() {
//location of file
String s = "C:\\TERRIERS\\terrier\\etc\\trec.models";
try {
FileOutputStream is = new FileOutputStream(s);
OutputStreamWriter osw = new OutputStreamWriter(is);
Writer w = new BufferedWriter(osw);
//depends on count value change the model inside "trec.models" and increase counter by 1
switch (counter) {
case 1 : w.write("uk.ac.gla.terrier.matching.models.BM25"); counter++; break;
case 2 : w.write("uk.ac.gla.terrier.matching.models.DFR_BM25"); counter++; break;
case 3 : w.write("uk.ac.gla.terrier.matching.models.TF_IDF"); counter++; break;
case 4 : w.write("uk.ac.gla.terrier.matching.models.BB2"); counter++; break;
case 5 : w.write("uk.ac.gla.terrier.matching.models.IFB2"); counter++; break;
case 6 : w.write("uk.ac.gla.terrier.matching.models.In_expB2"); counter++; break;
case 7 : w.write("uk.ac.gla.terrier.matching.models.In_expC2"); counter++; break;
case 8 : w.write("uk.ac.gla.terrier.matching.models.InL2"); counter++; break;
case 9 : w.write("uk.ac.gla.terrier.matching.models.PL2"); counter++; break;
case 10 : w.write("uk.ac.gla.terrier.matching.models.DFR"); counter++; break;
case 11 : w.write("uk.ac.gla.terrier.matching.models.DFRWeightingModel"); counter++; break;
case 12 : w.write("uk.ac.gla.terrier.matching.models.DLH"); counter++; break;
case 13 : w.write("uk.ac.gla.terrier.matching.models.DLH13"); counter++; break;
case 14 : w.write("uk.ac.gla.terrier.matching.models.Hiemstra_LM"); counter++; break;
case 15 : w.write("uk.ac.gla.terrier.matching.models.Idf"); counter++; break;
case 16 : w.write("uk.ac.gla.terrier.matching.models.LemurTF_IDF"); counter++; break;
case 17 : w.write("uk.ac.gla.terrier.matching.models.WeightingModel"); counter=1; break;//reset counter to 1
}
w.close();
}
catch (IOException e) {
}
}
我認為您的問題缺少同步。
您啟動兩個批處理文件( out.println("C:/TERRIERS/terrier/bin/trec_terrier.bat -i"); out.println("C:/TERRIERS/terrier/bin/trec_terrier.bat -r");
),而無需等待這些命令的完成,您可以調用modelSelect()
並啟動下兩個批處理文件。
整個過程的Java方面非常快-比批處理文件快得多。
最好的解決方案是等待批處理文件完成。 如果無法做到這一點,那么至少將您的代碼更改為
out.println("C:/TERRIERS/terrier/bin/trec_terrier.bat -i");
out.println("C:/TERRIERS/terrier/bin/trec_terrier.bat -r");
Thread.sleep(100);
//change model
modelSelect();
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