在Kotlin中创建ehcache缓存


Creating a ehcache cache in Kotlin

我在Kotlin中创建简单的ehcache缓存时遇到问题。我正在尝试使缓存尽可能通用，以便键值对为通用Pos和Move。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
import org.ehcache.CacheManager
import org.ehcache.Cache
import org.ehcache.config.builders.CacheManagerBuilder
import org.ehcache.config.builders.CacheConfigurationBuilder
import org.ehcache.config.builders.ResourcePoolsBuilder

class Main<reified Pos, reified Move> {

    val cm : CacheManager?
    val solvedPositions : Cache<Pos, Move>?

    init {
            cm = CacheManagerBuilder.newCacheManagerBuilder()
                               .withCache("solved", CacheConfigurationBuilder<Pos, Move>()
                               .withResourcePools(ResourcePoolsBuilder.heap(10)))
                               .buildConfig(Class<Pos>::class.java, Class<Move>::class.java)
                               .build(true);
            solvedPositions = cm.getCache("solved", Class<Pos>::class.java, Class<Move>::class.java);
    }


    fun main(args: Array<String>) {
    }
}

运行此程序将给出以下错误消息：

1
2
3
4
5
6
7
8
9
10
e: /Users/christophersumnicht/CacheIssue/src/main/kotlin/Main.kt: (7, 12): Only type parameters of inline functions can be reified
e: /Users/christophersumnicht/CacheIssue/src/main/kotlin/Main.kt: (7, 25): Only type parameters of inline functions can be reified
e: /Users/christophersumnicht/CacheIssue/src/main/kotlin/Main.kt: (14, 53): None of the following functions can be called with the arguments supplied:
private constructor CacheConfigurationBuilder<K : Any!, V : Any!>(keyType: Class<Pos!>!, valueType: Class<Move!>!, resourcePools: ResourcePools!) defined in org.ehcache.config.builders.CacheConfigurationBuilder
private constructor CacheConfigurationBuilder<K : Any!, V : Any!>(other: CacheConfigurationBuilder<Pos!, Move!>!) defined in org.ehcache.config.builders.CacheConfigurationBuilder
e: /Users/christophersumnicht/CacheIssue/src/main/kotlin/Main.kt: (16, 45): Only classes are allowed on the left hand side of a class literal
e: /Users/christophersumnicht/CacheIssue/src/main/kotlin/Main.kt: (16, 69): Only classes are allowed on the left hand side of a class literal
e: /Users/christophersumnicht/CacheIssue/src/main/kotlin/Main.kt: (18, 53): Only classes are allowed on the left hand side of a class literal
e: /Users/christophersumnicht/CacheIssue/src/main/kotlin/Main.kt: (18, 77): Only classes are allowed on the left hand side of a class literal
:compileKotlin FAILED

请注意，我也删除了reified，并且收到类似的错误。如何解决这些错误？

更新：

我试图通过Class实例作为构造函数，如下所示：

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
import org.ehcache.CacheManager
import org.ehcache.Cache
import org.ehcache.config.builders.CacheManagerBuilder
import org.ehcache.config.builders.CacheConfigurationBuilder
import org.ehcache.config.builders.ResourcePoolsBuilder

class Main<Pos, Move>(p: Class<Pos>, m: Class<Move>) {

    val cm : CacheManager?
    val solvedPositions : Cache<Class<Pos>, Class<Move>>?

    init {
        cm = CacheManagerBuilder.newCacheManagerBuilder()
                                .withCache("solved", CacheConfigurationBuilder<Pos, Move>()
                                .withResourcePools(ResourcePoolsBuilder.heap(10)))
                                .buildConfig(p.javaClass, m.javaClass)
                                .build(true);
        solvedPositions = cm.getCache("solved", p.javaClass, m.javaClass);
    }


    fun main(args: Array<String>) {
    }
}

不幸的是，私有构造函数仍然存在问题：

1
2
3
4
5
:compileKotlin
e: /Users/christophersumnicht/CacheIssue/src/main/kotlin/Main.kt: (14, 54): None of the following functions can be called with the arguments supplied:
private constructor CacheConfigurationBuilder<K : Any!, V : Any!>(keyType: Class<Pos!>!, valueType: Class<Move!>!, resourcePools: ResourcePools!) defined in org.ehcache.config.builders.CacheConfigurationBuilder
private constructor CacheConfigurationBuilder<K : Any!, V : Any!>(other: CacheConfigurationBuilder<Pos!, Move!>!) defined in org.ehcache.config.builders.CacheConfigurationBuilder
:compileKotlin FAILED

相关讨论

CacheConfigurationBuilder还存在一个问题：它没有公共构造函数，而需要使用：

1
CacheConfigurationBuilder.newCacheConfigurationBuilder(keyClass, valueClass, ResourcePools);

我相信您要使用的表单已存在于3.0.0的早期版本中，但在发布前已被删除，因为它允许尝试使用缺少必填字段的缓存配置。

仅就整个工作示例而言，这是最终工作的结果：

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
import org.ehcache.CacheManager
import org.ehcache.Cache
import org.ehcache.config.builders.CacheManagerBuilder
import org.ehcache.config.builders.CacheConfigurationBuilder
import org.ehcache.config.builders.ResourcePoolsBuilder

class Main<Pos, Move>(p: Class<Pos>, m: Class<Move>) {

    val cm : CacheManager?
    val solvedPositions : Cache<Class<Pos>, Class<Move>>?

    init {
        cm = CacheManagerBuilder.newCacheManagerBuilder()
                                .withCache("solved",
                                CacheConfigurationBuilder
                                .newCacheConfigurationBuilder(p.javaClass, m.javaClass, ResourcePoolsBuilder.heap(10))).build()
        solvedPositions = cm.getCache("solved", p.javaClass, m.javaClass)
    }


    fun main(args: Array<String>) {
    }
}