创建mapdb停止添加32个项目进入HashMap的

Question

这里以后是我的对象的定义：

public class Tuple_comparable implements Serializable, Comparable<Tuple_comparable> { 

    public String arg1_surface; 
    public String arg1_type; 
    public boolean arg1_type_equals; 
    public String relation; 
    public String arg2_surface; 
    public String arg2_type; 
    public boolean arg2_type_equals; 
    public Long count; 

    @Override 
    public boolean equals(Object o) { 
     if (!(o instanceof Tuple_comparable)) 
      return false; 
     Tuple_comparable oo = (Tuple_comparable)o; 
     if(oo.arg1_type.length() != this.arg1_type.length()) 
      return false; 
     if(oo.relation.length() != this.relation.length()) 
      return false; 
     if(oo.arg2_type.length() != this.arg2_type.length()) 
      return false; 
     if(!oo.arg1_type.equals(this.arg1_type)) 
      return false; 
     if(!oo.arg2_type.equals(this.arg2_type)) 
      return false; 
     if(!oo.relation.equals(this.relation)) 
      return false;   
     return true; 
    } 

    @Override 
    public int hashCode() { 
     return this.arg1_type.length() + this.relation.length() + this.arg2_type.length(); 
    } 

    @Override 
    public int compareTo(Tuple_comparable o) { 
     return 1; 
    } 
} 

这里是我如何使用的创建mapdb：

DB db = DBMaker.newFileDB(new File(folder + "unique_pairs_withDenoms_directed_forward_test_1" + "_mapdb.bin")) 
      //.closeOnJvmShutdown() 
      .make(); 

    // Create a Map: 
    Map<Tuple_comparable,long[]> myMap = db.getTreeMap("testmap"); 

    int i = 0; 

    for(i = 0; i < 100000; i++) { 
     // Work with the Map using the normal Map API. 
     Tuple_comparable tc = new Tuple_comparable(); 

     tc.arg1_surface = ""+ i; 
     tc.arg1_type = "" + i; 
     tc.arg1_type_equals = true; 
     tc.relation = "" + i; 
     tc.arg2_surface = ""; 
     tc.arg2_type = ""; 
     tc.arg2_type_equals = false; 
     tc.count = (long) 2222222; 

     long[] count = {1,2,3,4,4}; 

     i++; 
     myMap.put(tc, count); 
    } 
    db.commit(); 
    db.close();  

当我运行它，我看到了如下：

Proccessed = % 0.001 
After myMap.size() = 0 
Proccessed = % 0.003 
After myMap.size() = 1 
Proccessed = % 0.005 
After myMap.size() = 2 
Proccessed = % 0.007 
After myMap.size() = 3 
Proccessed = % 0.009 
After myMap.size() = 4 
Proccessed = % 0.011 
After myMap.size() = 5 
Proccessed = % 0.013 
After myMap.size() = 6 
Proccessed = % 0.015 
After myMap.size() = 7 
Proccessed = % 0.017 
After myMap.size() = 8 
Proccessed = % 0.019 
After myMap.size() = 9 
Proccessed = % 0.021 
After myMap.size() = 10 
Proccessed = % 0.023 
After myMap.size() = 11 
Proccessed = % 0.025 
After myMap.size() = 12 
Proccessed = % 0.027 
After myMap.size() = 13 
Proccessed = % 0.029 
After myMap.size() = 14 
Proccessed = % 0.031 
After myMap.size() = 15 
Proccessed = % 0.033 
After myMap.size() = 16 
Proccessed = % 0.035 
After myMap.size() = 17 
Proccessed = % 0.037 
After myMap.size() = 18 
Proccessed = % 0.039 
After myMap.size() = 19 
Proccessed = % 0.041 
After myMap.size() = 20 
Proccessed = % 0.043 
After myMap.size() = 21 
Proccessed = % 0.045 
After myMap.size() = 22 
Proccessed = % 0.047 
After myMap.size() = 23 
Proccessed = % 0.049 
After myMap.size() = 24 
Proccessed = % 0.051 
After myMap.size() = 25 
Proccessed = % 0.053 
After myMap.size() = 26 
Proccessed = % 0.055 
After myMap.size() = 27 
Proccessed = % 0.057 
After myMap.size() = 28 
Proccessed = % 0.059 
After myMap.size() = 29 
Proccessed = % 0.061 
After myMap.size() = 30 
Proccessed = % 0.063 
After myMap.size() = 31 
Proccessed = % 0.065 
After myMap.size() = 32 
Proccessed = % 0.067 
After myMap.size() = 33 

它会在第34个项目突然继续运行无限时间（虽然我期望它会继续添加1第000项）。当我删除myMap.put（....）时，它会一直持续到1000;所以put函数会有一些错误。我怀疑我有一个问题（或者在对象类型的定义中缺少一个属性）。

任何人都知道我使用MapDB有什么问题吗？

Answer 1

问题是这样的：

public int compareTo(Tuple_comparable o) { 
    return 1; 
} 

我不打算在这里解释一下。首先，我会推荐HashMap，并通过IDE生成equals/hashcode。

MapDB 1.0会死锁，但在2.0中解决。所以我不认为这是一个问题。