Scala based automatic resource freeing

Using following scala resource, one freely release resources like(InputStrea, OutputStream, Sockets, JDBC Connection, JDBC ResultSet, JDBC Statements, SSLSocket, ServerSocket)

Source
Example Usage

ResourceTest.scala

object ResourceTest {
    import java.sql.{Connection,ResultSet}
    val OraPool = ConnPool("orahost152:1521",3, Db ) // some how get oracle jdbc connection

    def main ( args : Array[String] ): Unit =  {
        Resource.use (OraPool.getConnection){ conn =>
            val ts = find(conn)
            for ( v <- ts ) println(v)
        }
    }
    case class Tab(tname: String, tabtype: String)

    def find(conn: Connection): List[Tab] = {
        Resource.use(conn.createStatement){st =>
            Resource.use (st.executeQuery("select tname,tabtype from tab")){ rs =>
                import scala.collection.mutable.ListBuffer
                var list = List[Tab]() 
                while(rs.next()){
                    list ::= Tab(rs.getString("tname"), rs.getString("tabtype"))
                }
                list 
            }
        }
    }
}

Find javac tasks in build.xml that does compile without line-number information

Majority of ANT build files for java proje use javac-task for compiling the java files. But if the javac task does not have debug=true or debug=yes, then compiled java-class files does not contain line numbers in stacktraces. Following groovy script will check all build files in given file and check all javac taks that does not have debug-flags setting off

def s1=System.currentTimeMillis()
def f = new  File('c:/all_build_files.txt')
def counter=0
def error=0
def noDebug=0
def noJavac=0
def debug=Boolean.getBoolean("debug")
f.eachLine{
   try{
       def file=it
       def project = new XmlSlurper().parse(new File(file))
       def tasks = project.target.javac
       if( tasks.size() > 0){
           noJavac++
           if(debug) println "javac tasks: ${tasks.size()}"
           def found=true
           def nfound=0  
           tasks.each{
               def flag=it.@debug
               if (!( flag =~ /yes/ || flag =~ /true/ )) {
                   nfound++
                   found=false  
               }
           }
           if(!found) {
               noDebug++
               println "${nfound} : ${file}"
           }
       }
       counter++
   }catch(Exception e){
       error++
       if(debug) println "${it} --> ${e}"
   }
}
def s2=System.currentTimeMillis()
def sd=s2-s1
println "Parsed files:${counter}, Errors:${error}, noDebug:${noDebug}, Javac:${noJavac} Time in millis:${sd}"

Run the above script(buildFile.groovy) using:


C:\>groovy -Ddebug=1true buildFile.groovy 2>nul

...
1 : C:\src\nb-src\main\xtest\build.xml
2 : C:\src\nb-src\main\xtest\pes\build.xml
2 : C:\src\nb-src\main\xtest\plugins_src\ide\build.xml
1 : C:\src\nb-src\main\xtest\plugins_src\jvm\build.xml
Parsed files:4866, Errors:29, noDebug:722, Javac:839 Time in millis:11859