本文整理汇总了Scala中org.iq80.leveldb.DB类的典型用法代码示例。如果您正苦于以下问题：Scala DB类的具体用法？Scala DB怎么用？Scala DB使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了DB类的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Scala代码示例。
示例1: db_utils
//设置package包名称以及导入依赖的类
package bycicle_tool
import org.iq80.leveldb.{DB, _}
import org.fusesource.leveldbjni.JniDBFactory._
import java.io._
import utils._
//??????????????????????????????????????????????????????????????????????
object db_utils {
private lazy val _db : DB = {
sConfig.onCloseCallbacks += {() => if (_db != null) _db.close() }
openDb()
}
//----------------------------------------------------------------------
def openDb() : DB = {
val options = new Options()
options.createIfMissing(true)
val db = factory.open(
new File(sConfig.sDBDirPath),
options
)
if (db == null) {
exitWithError("Con't open build database'")
}
return db
}
//----------------------------------------------------------------------
def checkModified(path : String) : Boolean = {
val file = new File(path)
if (!file.exists()) return true
val fileModifiedKey = file.getCanonicalPath() + "_lastModified"
val lastModifiedBytes = _db.get(
bytes(fileModifiedKey),
new ReadOptions()
)
if (lastModifiedBytes == null ) {
return true
} else {
val lmodDB = new String(lastModifiedBytes).toLong
val modCur = recursiveLatestModified(file)
System.out.println(s"$path saved last modify: $lmodDB, current modify date: $modCur")
return modCur > lmodDB
}
}
//----------------------------------------------------------------------
} 示例2: LevelDBDataSource
//设置package包名称以及导入依赖的类
package io.iohk.ethereum.db.dataSource
import java.io.File
import io.iohk.ethereum.utils.Config
import org.iq80.leveldb.{DB, Options, WriteOptions}
import org.iq80.leveldb.impl.{Iq80DBFactory, WriteBatchImpl}
class LevelDBDataSource(
private var db: DB,
private val levelDbConfig: LevelDbConfig
)
extends DataSource {
override def destroy(): Unit = {
try {
close()
} finally {
Iq80DBFactory.factory.destroy(new File(levelDbConfig.path), null) // Options are not being used ¯\_(?)_/¯
}
}
}
trait LevelDbConfig {
val createIfMissing: Boolean
val paranoidChecks: Boolean
val verifyChecksums: Boolean
val path: String
}
object LevelDBDataSource {
private def createDB(levelDbConfig: LevelDbConfig): DB = {
import levelDbConfig._
val options = new Options()
.createIfMissing(createIfMissing)
.paranoidChecks(paranoidChecks) // raise an error as soon as it detects an internal corruption
.verifyChecksums(verifyChecksums) // force checksum verification of all data that is read from the file system on behalf of a particular read
Iq80DBFactory.factory.open(new File(path), options)
}
def apply(levelDbConfig: LevelDbConfig): LevelDBDataSource = {
new LevelDBDataSource(createDB(levelDbConfig), levelDbConfig)
}
}