package anni.handler;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.util.Date;
import org.apache.axis.AxisFault;
import org.apache.axis.Handler;
import org.apache.axis.MessageContext;
import org.apache.axis.handlers.BasicHandler;

public class LogHandler extends BasicHandler {
    /**
        invoke，每一個handler都必須實現的方法。
     */
    public void invoke(MessageContext msgContext) throws AxisFault {
        //每當web服務被調用，都記錄到log中。
        try {
            Handler handler = msgContext.getService();
            String filename = (String)getOption("filename");
            if ((filename == null) || (filename.equals("")))
                throw new AxisFault("Server.NoLogFile",
                    "No log file configured for the LogHandler!",
                    null, null);
            FileOutputStream fos = new FileOutputStream(filename, true);            
            PrintWriter writer = new PrintWriter(fos);            
            Integer counter = (Integer)handler.getOption("accesses");
            if (counter == null)
                counter = new Integer(0);

            counter = new Integer(counter.intValue() + 1);            
            Date date = new Date();
            msgContext.getMessage().writeTo(System.out);
           
            String result = "在" + date + ": Web 服務 " +
                msgContext.getTargetService() +
                " 被調用，現在已經共調用了 " + counter + " 次.";
            handler.setOption("accesses", counter);            
            writer.println(result);            
            writer.close();
        } catch (Exception e) {
            throw AxisFault.makeFault(e);
        }
    }
}