編年史問題？難道我做錯了什麼？

Question

這個程序，使用net.openhft：chronicle：3.5.3，說明了我在使用Chronicle時遇到的以下問題。

1香草Chronicle.size（）返回瘋狂值

2 ExcerptTailer.toStart不上的索引紀事

3 ExcerptTailer.index（-1）的工作不上的香草紀事工作

import net.openhft.chronicle.Chronicle; 
import net.openhft.chronicle.ChronicleQueueBuilder; 
import net.openhft.chronicle.ExcerptAppender; 
import net.openhft.chronicle.ExcerptTailer; 
import org.apache.commons.io.FileUtils; 

import java.io.File; 

/* 
* These functions demonstrate a number of issues I've come across. 
* */ 
public class Problems { 

    public static void main(String[] a) throws Exception { 
     sizeAndLastIndexWrittenProblem(); 
     //indexedToStartDoesntWork(); 
     //vanillaToIndexDoesntWork(); 
    } 

    static void sizeAndLastIndexWrittenProblem() throws Exception { 
     File f = new File("cron"); 
     FileUtils.deleteDirectory(f); 

     Chronicle chronicle = ChronicleQueueBuilder.vanilla(new File(f, "chronicle")).build(); 

     ExcerptAppender ap = chronicle.createAppender(); 

     // vanilla provides sensible values first of all 
     Assert(chronicle.size() == 0); 
     Assert(chronicle.lastWrittenIndex() == -1); 

     ap.startExcerpt(); 
     ap.writeInt(1); 
     ap.finish(); 

     // but after appending to a vanilla then these lines print insane values eg 
     // size = 18410222695481345 
     // lastWrittenIndex = 18410222695481344 
     System.out.println("size = " + chronicle.size()); 
     System.out.println("lastWrittenIndex = " + chronicle.lastWrittenIndex()); 

     Assert(chronicle.size() == 1); // FAILS HERE 
     Assert(chronicle.lastWrittenIndex() == 0); 

     // note that the same code using an indexed chronicla passes ok 
    } 


    static void indexedToStartDoesntWork() throws Exception { 
     File f = new File("cron"); 
     FileUtils.deleteDirectory(f); 

     Chronicle chronicle = ChronicleQueueBuilder.indexed(new File(f,"chronicle")).build(); 

     ExcerptAppender ap = chronicle.createAppender(); 
     ExcerptTailer t = chronicle.createTailer(); 

     ap.startExcerpt(); 
     ap.writeInt(1); 
     ap.finish(); 

     Assert(t.nextIndex()); // ok 
     Assert(t.readInt() == 1); // ok 
     t.finish(); 

     ap.startExcerpt(); 
     ap.writeInt(2); 
     ap.finish(); 

     Assert(t.nextIndex()); // ok 
     Assert(t.readInt() == 2); // ok 
     t.finish(); 

     /* 
     On an indexed chronicle toStart does not rewind to start so the next read fails. 
     I found that if using indexed then one must use index(-1) not toStart 
     */ 
     t.toStart(); // DOESN'T REWIND US TO START 

     Assert(t.nextIndex()); // FAILS HERE IF USING toStart BUT OK IF USING index(-1) 
     Assert(t.readInt() == 1); 
    } 

    static void vanillaToIndexDoesntWork() throws Exception { 
     File f = new File("cron"); 
     FileUtils.deleteDirectory(f); 

     Chronicle chronicle = ChronicleQueueBuilder.vanilla(new File(f,"chronicle")).build(); 

     ExcerptAppender ap = chronicle.createAppender(); 
     ExcerptTailer t = chronicle.createTailer(); 

     ap.startExcerpt(); 
     ap.writeInt(1); 
     ap.finish(); 

     Assert(t.nextIndex()); // ok 
     Assert(t.readInt() == 1); // ok 
     t.finish(); 

     ap.startExcerpt(); 
     ap.writeInt(2); 
     ap.finish(); 

     Assert(t.nextIndex()); // ok 
     Assert(t.readInt() == 2); // ok 
     t.finish(); 


     /* 
     On an vanilla chronicle index(-1) does not rewind to start so the next read fails. 
     I found that if using vanilla then one must use toStart not index(-1) 
     */ 
     t.index(-1); // DOESN'T REWIND US TO START 

     Assert(t.nextIndex()); // FAILS HERE IF USING index(-1) BUT OK IF USING toStart() 
     Assert(t.readInt() == 1); 
    } 

    static void Assert(boolean b) { 
     if (!b) throw new RuntimeException("bang"); 
    } 
} 

Answer 1

正如編年史小組所述，toStart問題看起來像一個錯誤，我需要檢查。

如果你在GitHub上打開一個測試失敗的問題會很好。公關將受到歡迎。

關於VanillaChronicle中的瘋狂值請注意，索引不像IndexedChronicle那樣工作，因爲香草指數也包含關於您正在使用的循環的信息，撰寫摘錄等的線索，因此您看到的值是正確的。