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package org.glassfish.appclient.client.acc.agent;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.LineNumberReader;
import java.lang.instrument.Instrumentation;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.glassfish.appclient.client.AppClientFacade;
import org.glassfish.appclient.client.CLIBootstrap;
import org.glassfish.appclient.client.acc.UserError;

/**
 * Agent which prepares the ACC before the VM launches the selected main program.
 * 

* This agent gathers processes agent arguments, supplied either by the * appclient script or the end-user (when entering a java command directly), * and processes those arguments. The primary purpose is to: *

    *
  1. identify the main class that the Java launcher has decided to start, *
  2. create and initialize a new app client container instance, asking the * ACC to load and inject the indicated main class in the process if and only if * the main class is not the AppClientCommand class. *
* Then the agent is done. The java launcher and the VM see to it that the main class's * main method is invoked. * * @author tjquinn */ public class AppClientContainerAgent { private static Logger logger = Logger.getLogger(AppClientContainerAgent.class.getName()); public static void premain(String agentArgsText, Instrumentation inst) { try { final long now = System.currentTimeMillis(); /* * The agent prepares the ACC but does not launch the client. */ AppClientFacade.prepareACC(optionsValue(agentArgsText),inst); logger.fine("AppClientContainerAgent finished after " + (System.currentTimeMillis() - now) + " ms"); } catch (UserError ue) { ue.displayAndExit(); } catch (Exception e) { e.printStackTrace(); System.exit(1); } } private static String optionsValue(final String agentArgsText) throws FileNotFoundException, IOException { if (agentArgsText == null) { throw new IllegalArgumentException(); } if (! agentArgsText.startsWith(CLIBootstrap.FILE_OPTIONS_INTRODUCER)) { return agentArgsText; } final File argsFile = new File(agentArgsText.substring(CLIBootstrap.FILE_OPTIONS_INTRODUCER.length())); final LineNumberReader reader = new LineNumberReader(new FileReader(argsFile)); final String result; try { result = reader.readLine(); } finally { reader.close(); } if (Boolean.getBoolean("keep.argsfile")) { System.err.println("Agent arguments file retained: " + argsFile.getAbsolutePath()); } else { if ( ! argsFile.delete()) { logger.log(Level.FINE, "Unable to delete temporary args file {0}; continuing", argsFile.getAbsolutePath()); } } return result; } }




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