编年史问题？难道我做错了什么？

Question

这个程序，使用net.openhft：chronicle：3.5.3，说明了我在使用Chronicle时遇到的以下问题。

1香草Chronicle.size（）返回疯狂值

2 ExcerptTailer.toStart不上的索引纪事

3 ExcerptTailer.index（-1）的工作不上的香草纪事工作

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

正如编年史小组所述，toStart问题看起来像一个错误，我需要检查。

如果你在GitHub上打开一个测试失败的问题会很好。公关将受到欢迎。

关于VanillaChronicle中的疯狂值请注意，索引不像IndexedChronicle那样工作，因为香草指数也包含关于您正在使用的循环的信息，撰写摘录等的线索，因此您看到的值是正确的。