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-rw-r--r--java/src/ServiceConfig.java375
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diff --git a/java/src/ServiceConfig.java b/java/src/ServiceConfig.java
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- /*************************************************
- *
- * = PACKAGE
- * JACE.ServiceConfigurator
- *
- * = FILENAME
- * ServiceConfig.java
- *
- * Services can be suspended, resumed, removed, and reloaded. Reloading requires a
- * call to prepareForReload method after removing a service (done in remove()). You can't access
- * the ServiceObjects that are loaded directly -- anything loaded with a class loader
- * must be wrapped and have its methods called via reflection. This is because a
- * loaded class doesn't exist in the same space as one loaded with the system loader.
- *
- *
- *@author Prashant Jain, Everett Anderson
- *
- *************************************************/
-package JACE.ServiceConfigurator;
-
-import java.io.*;
-import java.util.*;
-import java.net.*;
-import JACE.OS.*;
-import JACE.Misc.*;
-
-/**
- * <hr>
- * <p><b>TITLE</b><br>
- * Provide the base class that supplies common server daemon
- * operations. Also provides a global point for interacting with
- * the service repository.
- */
-public class ServiceConfig
-{
- /** Begins the process of loading a service configurator file:
- * parses the command line and calls processDirectives
- *
- *@exception FileNotFoundException Couldn't find service config file
- *@exception IOException Problem reading or parsing
- *@exception ClassNotFoundException Couldn't find a certain class
- *@exception IllegalAccessException Inappropriate method call on a class
- *@exception InstantiationException Couldn't create a certain class instance
- */
- public static int open (String [] args) throws FileNotFoundException, IOException, ClassNotFoundException, IllegalAccessException, InstantiationException
- {
- // Parse the command line
- ServiceConfig.parseArgs (args);
-
- // Create a repository and class loader
- if (ServiceConfig.svcRep_ == null)
- ServiceConfig.svcRep_ = new ServiceRepository ();
- if (ServiceConfig.loader_ == null)
- ServiceConfig.loader_ = new ServiceLoader();
-
- return ServiceConfig.processDirectives ();
-
- }
-
- /** Parses the command line
- * Valid command line options:
- * -b Run as a daemon (not implemented yet)
- * -d Debug mode
- * -n No defaults
- * -f <filename> Load services in the given file [see below for info]
- *
- */
- protected static void parseArgs (String [] args)
- {
- GetOpt getopt = new GetOpt (args, "bdnf:");
- for (int c; (c = getopt.next ()) != -1; )
- switch (c)
- {
- case 'b':
- // Note: not supported yet!
- ServiceConfig.beADaemon_ = true;
- break;
- case 'd':
- ServiceConfig.debug_ = true;
- break;
- case 'n':
- ServiceConfig.noDefaults_ = true;
- break;
- case 'f':
- ServiceConfig.serviceConfigFile_ = getopt.optarg ();
- break;
- default:
- ACE.ERROR ((char ) c + " is not a ServiceConfig option");
- break;
- }
- }
-
- /** Called by ParseNode subclass
- * Asks the Service Repository to spend a service
- */
- public static int suspend (String name)
- {
- return svcRep_.suspend(name);
- }
-
- /** Called by ParseNode subclass
- * Asks the Service Repository to resume a service
- */
- public static int resume (String name)
- {
- return svcRep_.resume(name);
- }
-
- /** Called by ParseNode subclass
- * Asks the Service Repository to remove a service, also calls
- * prepareForReload so the user doesn't have to.
- */
- public static int remove (String name)
- {
- int result = svcRep_.remove(name);
-
- prepareForReload();
-
- return result;
- }
-
- /** Should be called before the user wants to reload
- * a service. This calls garbage collection to
- * (hopefully) obliterate the names of any unused
- * service classes, and creates a new instance
- * of the ClassLoader so there won't be problems
- * reloading.
- */
- public static void prepareForReload()
- {
- ServiceConfig.loader_ = new ServiceLoader();
-
- System.gc();
-
- }
-
- /**
- * Parse a service configurator file, creating classes as necessary
- *
- * This is getting complicated, but there were too many installation problems when using
- * CUP and JLex to merit developing a grammar.
- *
- * Current formats:
- *
- * load <Service Name> <Full Class Name> Service_Object "<argument list>"
- *
- * resume <Service Name>
- * suspend <Service Name>
- * remove <Service Name>
- *
- *@exception FileNotFoundException Couldn't find the file (default "svc.conf")
- *@exception IOException Problem reading/parsing
- *@exception ClassNotFoundException Couldn't find a certain class
- *@exception IllegalAccessException Inappropriate method call
- *@exception InstantiationException Couldn't create a class instance
- */
- protected static int processDirectives () throws FileNotFoundException, IOException, ClassNotFoundException, IllegalAccessException, InstantiationException
- {
- if (ServiceConfig.serviceConfigFile_ == null)
- ServiceConfig.serviceConfigFile_ = "svc.conf";
-
- ACE.DEBUG("Processing directives in file " + ServiceConfig.serviceConfigFile_);
-
- File configFile = new File (ServiceConfig.serviceConfigFile_);
-
- // Check if file exists and is a normal file
- if (!configFile.exists () || !configFile.isFile ())
- throw new FileNotFoundException ("File " + ServiceConfig.serviceConfigFile_ + " not found");
-
- // Check if the file is readable
- if (!configFile.canRead ())
- throw new IOException ("File " + ServiceConfig.serviceConfigFile_ + " not readable");
-
- // Set up the stream
- FileInputStream fileIn = new FileInputStream (configFile);
-
- // Parse the file
- Reader r = new BufferedReader(new InputStreamReader(fileIn));
- StreamTokenizer in = new StreamTokenizer (r);
-
- // Set '#' as comment character to be ignored and set '/' as
- // ordinary character (was original comment character)
- // in.commentChar ('#');
- in.ordinaryChar ('/');
-
- // Set characters in ASCII range 33 to 47, ASCII range 91 to 96,
- // and ASCII range 123 to 126 as ordinary characters
- in.wordChars ('!', '/'); // ASCII range 33 to 47
- in.wordChars (':', '@'); // ASCII range 58 to 64
- in.wordChars ('[', '`'); // ASCII range 91 to 96
- in.wordChars ('{', '~'); // ASCII range 123 to 126
-
- String commandName = null;
- String serviceName = null;
- String className = null;
- String classType = null;
- String args = null;
- // Create a state machine
- int state = ServiceConfig.COMMAND_NAME;
-
- // The apply() method on ParseNode starts the process of actually executing the
- // desired action (suspend, load, etc)
- ParseNode result = null;
-
- while (in.nextToken () != StreamTokenizer.TT_EOF)
- {
- switch (state)
- {
- case ServiceConfig.COMMAND_NAME:
- if (in.ttype == StreamTokenizer.TT_WORD) {
- commandName = in.sval;
-
- // **** This should be changed so that instantiation is only done
- // when we find out the type (ServiceObject or something else) a few
- // words later. Right now it works because we only have ServiceObjects
- // to load.
- if (commandName.equals("load"))
- result = new AddServiceObjectNode();
- else
- if (commandName.equals("remove"))
- result = new RemoveNode();
- else
- if (commandName.equals("suspend"))
- result = new SuspendNode();
- else
- if (commandName.equals("resume"))
- result = new ResumeNode();
- else
- throw new IOException ("COMMAND NAME missing or invalid: " + commandName);
-
- ACE.DEBUG("Command node type: " + ((Object)result).getClass().getName());
-
-
- } else
- throw new IOException ("Illegal COMMAND NAME argument in file " + ServiceConfig.serviceConfigFile_);
- state = ServiceConfig.SERVICE_NAME;
- break;
- case ServiceConfig.SERVICE_NAME:
- if (in.ttype == StreamTokenizer.TT_WORD)
- serviceName = in.sval;
- else
- throw new IOException ("Illegal SERVICE NAME argument in file " + ServiceConfig.serviceConfigFile_);
-
-
- if (!commandName.equals("load")) {
- result.init(serviceName);
- result.apply();
- in.whitespaceChars (' ', ' ');
- state = ServiceConfig.SERVICE_NAME;
- } else
- state = ServiceConfig.CLASS_NAME;
- break;
- case ServiceConfig.CLASS_NAME:
- if (in.ttype == StreamTokenizer.TT_WORD)
- className = in.sval;
- else
- throw new IOException ("Illegal CLASS NAME argument in file " + ServiceConfig.serviceConfigFile_);
- state = ServiceConfig.CLASS_TYPE;
- break;
- case ServiceConfig.CLASS_TYPE:
- // This is only Service_Object or ServiceObject at this time
- if (in.ttype == StreamTokenizer.TT_WORD)
- classType = in.sval;
- else
- throw new IOException ("Illegal CLASS TYPE argument in file " + ServiceConfig.serviceConfigFile_);
- state = ServiceConfig.ARGS;
- // Set space to be an ordinary character to allow
- // arguments to be parsed in
- in.wordChars (' ', ' ');
- break;
- case ServiceConfig.ARGS:
- ACE.DEBUG("Processing arguments");
-
- args = new String("");
-
- if (in.ttype == StreamTokenizer.TT_WORD)
- {
- args = in.sval;
-
- // If just two double quotes, there are no args
- if (args.length() == 2) {
- args = new String("");
- } else
- args = args.substring(1, args.length() - 1);
- }
-
- // Quick hack until more parsing necessary -- set the needed data
- ((AddServiceObjectNode)result).init(serviceName, className, false);
- ((AddServiceObjectNode)result).params(args);
-
- result.apply();
-
- state = ServiceConfig.SERVICE_NAME;
- // Set space back to whitespace-character to extract the
- // next token
- in.whitespaceChars (' ', ' ');
- break;
- default:
- throw new IOException ("Illegal argument in file " + ServiceConfig.serviceConfigFile_);
- }
- }
- return 0;
- }
-
-
- /**
- * This is called when apply() is called on AddServiceObjectNodes. Similar
- * methods could be developed for later data types (AddStreamNode, etc). This
- * tries to load the ServiceObject and its classes. When trying to find info
- * from the C++ files, this generates possible file paths.
- */
- public static int initialize (AddServiceObjectNode son)
- {
- Class c = null;
-
- try {
-
- c = loader_.loadClass(son.locator(), true);
-
- } catch (ClassNotFoundException e) {
- ACE.ERROR("Can't find class with locator: " + son.locator());
- return -1;
- }
-
- try {
-
- Object service = c.newInstance();
- // Can't cast this to a ServiceObject, even though it will look just
- // like one -- Java puts things loaded with a non-standard class loader
- // in their own name space. The ServiceObjectRecord is a wrapper that
- // gets around this by using reflection.
- ServiceObjectRecord svcObjRec = new ServiceObjectRecord(service, son.name());
-
- // Split the argument array up into smaller pieces
- String [] argArray = OS.createStringArray (son.params(), " ");
-
- // Initialize the service -- start it running
- svcObjRec.init(argArray);
-
- // Put it in the service repository
- svcRep_.insert((ServiceRecord)svcObjRec);
-
- } catch (IllegalAccessException e) {
- ACE.ERROR("Error " + e);
- return -1;
- } catch (InstantiationException e) {
- ACE.ERROR("Error " + e);
- return -1;
- }
-
- return 0;
- }
-
- // Set by command line options
- private static boolean beADaemon_ = false;
- private static boolean debug_ = false;
- private static boolean noDefaults_ = false;
-
- public static String serviceConfigFile_ = "svc.conf";
-
- private static ServiceRepository svcRep_ = null;
- private static ServiceLoader loader_ = null;
-
- // States for the state-machine used in parsing the config file
- private final static int SERVICE_NAME = 0;
- private final static int CLASS_NAME = 1;
- private final static int CLASS_TYPE = 2;
- private final static int ARGS = 3;
- private final static int COMMAND_NAME = 4;
-
-
-}
-
-
-