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java.lang.Objectedu.ucsb.nceas.metacat.DBConnectionPool
A class represent a DBConnection pool. Another user can use the object to initial a connection pool, get db connection or return it. This a singleton class, this means only one instance of this class could be in the program at one time.
Method Summary | |
static DBConnection |
getDBConnection(java.lang.String methodName)
Method to get a DBConnection in connection pool 1) try to get a DBConnection from DBConnection pool 2) if 1) failed, then check the size of pool. |
static int |
getFreeDBConnectionNumber()
Method to get the number of free DBConnection in DBConnection pool |
static DBConnectionPool |
getInstance()
Returns the single instance, creating one if it's the first time this method is called. |
int |
getSizeOfDBConnectionPool()
Method to get the size of DBConnectionPool |
void |
printMethodNameHavingBusyDBConnection()
Method to print out the method name which have busy DBconnection |
static void |
release()
Method to shut down all connections |
static void |
returnDBConnection(DBConnection conn,
int serialNumber)
Method to return a connection to DBConnection pool. |
void |
run()
periodically to recycle the connection |
static boolean |
shrinkConnectionPoolSize()
Method to decrease dbconnection pool size when all dbconnections are idle If all connections are free and connection pool size greater than initial value, shrink connection pool size to intital value |
static void |
shrinkDBConnectionPoolSize()
Method to decrease dbconnection pool size when all dbconnections are idle If all connections are free and connection pool size greater than initial value, shrink connection pool size to intital value |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Method Detail |
public static DBConnectionPool getInstance() throws java.sql.SQLException
java.sql.SQLException
public int getSizeOfDBConnectionPool()
public static DBConnection getDBConnection(java.lang.String methodName) throws java.sql.SQLException
java.sql.SQLException
public static void returnDBConnection(DBConnection conn, int serialNumber)
public static void release()
public void run()
run
in interface java.lang.Runnable
public static int getFreeDBConnectionNumber()
public void printMethodNameHavingBusyDBConnection()
public static boolean shrinkConnectionPoolSize()
public static void shrinkDBConnectionPoolSize()
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