Creating a cache for a game?

Hi, i'm creating (trying) a game. Now i've been thinking about everything goes and i came with the question about how i to load data about maps, objects etc. It is a 2d game using tiles
So i know runescape uses a cache to store their data about these.
But i've NO idea how i could make it?
Someone told me i this:
"use dataOutputStream to create a data cache along with an index file being the offsets and lengths of the required data."
- I know we use dataOutputStream to load/save.
- I know how to encrypt (this is not important atm)
- I don't know how i define a tile for an x or y (*)
- I don't know how i've to make a data cache ?
- I don't understand what he means by an index file with the offsets and lengths?
(*) How do 2d games load it? They use xml? or just text files ? like
// x -tab- y -tab- floor
0 -tab- 0 -tab- 1 so the above says on x = 0 and y = 0 floor = 1 (grass for example)
Please if anyone could give me an example of this it would be great !!!
This is really important!
Thanks in advance!
Edited by: Kolarius on Feb 7, 2009 1:39 AM
Edited by: Kolarius on Feb 7, 2009 1:41 AM
Edited by: Kolarius on Feb 7, 2009 1:55 AM

What you're asking is a bit like this: "I want to build a house, what is the best way to make a roof?". I mean, you should first create a foundation, on that foundation you build your walls and on top of that, you can eventually build a roof.
First get a decent grip on the language Java: [http://java.sun.com/docs/books/tutorial/java/index.html]
Then delve into some more specific graphic stuff with Java: [http://java.sun.com/docs/books/tutorial/2d/index.html]
And only then proceed to creating your own game: [http://www.gamedev.net/reference/articles/article1262.asp]
If you get stuck anywhere along the lines, feel free to post a specific question in the relevant part of this forum (there's a 2D section, a Game section and this section can be used to ask general Java questions). The question you now posted is nowhere near specific enough: it just can't be answered in a few lines of code or a (fairly) short explanation.

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Hi Chris,
thanks for your reply!
I've tried to add the following into persistence.xml (although I've read that eclipseLink uses L2 cache by default..):
<shared-cache-mode>ALL</shared-cache-mode>
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Genre findGenreCreateIfAbsent(String genreName){
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As far as I undestood, the shared cache should automatically store the genre and avoid querying the DB multiple times for the same genre, but unfortunately this is not the case: if I use a FINE logging level, I see really a lot of SELECT queries, which I didn't see with my "home made" Cache...
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How to create a cache for JPA Entities using an EJB

Hello everybody! I have recently got started with JPA 2.0 (I use eclipseLink) and EJB 3.1 and have a problem to figure out how to best implement a cache for my JPA Entities using an EJB.
In the following I try to describe my problem.. I know it is a bit verbose, but hope somebody will help me.. (I highlighted in bold the core of my problem, in case you want to first decide if you can/want help and in the case spend another couple of minutes to understand the domain)
I have the following JPA Entities:
@Entity Genre{
private String name;
@OneToMany(mappedBy = "genre", cascade={CascadeType.MERGE, CascadeType.PERSIST})
private Collection<Novel> novels;
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class Novel{
@ManyToOne(cascade={CascadeType.MERGE, CascadeType.PERSIST})
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private String titleUnique;
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private Collection<NovelEdition> editions;
@Entity
class NovelEdition{
private String publisherNameUnique;
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private Novel novel;
@ManyToOne(optional=false, cascade={CascadeType.MERGE, CascadeType.PERSIST})
private Catalog appearsInCatalog;
@Entity
class Catalog{
private String name;
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private Collection<NovelEdition> novelsInCatalog;
The idea is to have several Novels, belonging each to a specific Genre, for which can exist more than an edition (different publisher, year, etc). For semplicity a NovelEdition can belong to just one Catalog, being such a Catalog represented by such a text file:
FILE 1:
Catalog: Name Of Catalog 1
"Title of Novel 1", "Genre1 name","Publisher1 Name", 2009
"Title of Novel 2", "Genre1 name","Pulisher2 Name", 2010
FILE 2:
Catalog: Name Of Catalog 2
"Title of Novel 1", "Genre1 name","Publisher2 Name", 2011
"Title of Novel 2", "Genre1 name","Pulisher1 Name", 2011
Each entity has associated a Stateless EJB that acts as a DAO, using a Transaction Scoped EntityManager. For example:
@Stateless
public class NovelDAO extends AbstractDAO<Novel> {
@PersistenceContext(unitName = "XXX")
private EntityManager em;
protected EntityManager getEntityManager() {
return em;
public NovelDAO() {
super(Novel.class);
//NovelDAO Specific methods
I am interested at when the catalog files are parsed and the corresponding entities are built (I usually read a whole batch of Catalogs at a time).
Being the parsing a String-driven procedure, I don't want to repeat actions like novelDAO.getByName("Title of Novel 1") so I would like to use a centralized cache for mappings of type String-Identifier->Entity object.
Currently I use +3 Objects+:
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final CatalogBuilder catalogBuilder = //JNDI Lookup
//for each file:
String catalogName = parseCatalogName(file);
catalogBuilder.setCatalogName(catalogName);
//For each novel edition
String title= parseNovelTitle();
String genre= parseGenre();
catalogBuilder.addNovelEdition(title, genre, publisher, year);
//End foreach
catalogBuilder.build();
2) The CatalogBuilder is a Stateful EJB which uses the Cache and gets re-initialized every time a new Catalog file is parsed and gets "removed" after a catalog is persisted.
@Stateful
public class CatalogBuilder {
@PersistenceContext(unitName = "XXX", type = PersistenceContextType.EXTENDED)
private EntityManager em;
@EJB
private Cache cache;
private Catalog catalog;
@PostConstruct
public void initialize() {
catalog = new Catalog();
catalog.setNovelsInCatalog(new ArrayList<NovelEdition>());
public void addNovelEdition(String title, String genreStr, String publisher, String year){
Genre genre = cache.findGenreCreateIfAbsent(genreStr);//##
Novel novel = cache.findNovelCreateIfAbsent(title, genre);//##
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novEd.setNovel(novel);
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catalog.getNovelsInCatalog().add();
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catalog.setName(name);
@Remove
public void build(){
em.merge(catalog);
3) Finally, the problematic bean: Cache. For CatalogBuilder I used an EXTENDED persistence context (which I need as the Parser executes several succesive transactions) together with a Stateful EJB; but in this case I am not really sure what I need. In fact, the cache:
Should stay in memory until the parser is finished with its job, but not longer (should not be a singleton) as the parsing is just a very particular activity which happens rarely.
Should keep all of the entities in context, and should return managed entities form mehtods marked with ##, otherwise the attempt to persist the catalog should fail (duplicated INSERTs)..
Should use the same persistence context as the CatalogBuilder.
What I have now is :
@Stateful
public class Cache {
@PersistenceContext(unitName = "XXX", type = PersistenceContextType.EXTENDED)
private EntityManager em;
@EJB
private sessionbean.GenreDAO genreDAO;
//DAOs for other cached entities
Map<String, Genre> genreName2Object=new TreeMap<String, Genre>();
@PostConstruct
public void initialize(){
for (Genre g: genreDAO.findAll()) {
genreName2Object.put(g.getName(), em.merge(g));
public Genre findGenreCreateIfAbsent(String genreName){
if (genreName2Object.containsKey(genreName){
return genreName2Object.get(genreName);
Genre g = new Genre();
g.setName();
g.setNovels(new ArrayList<Novel>());
genreDAO.persist(t);
genreName2Object.put(t.getIdentifier(), em.merge(t));
return t;
But honestly I couldn't find a solution which satisfies these 3 points at the same time. For example, using another stateful bean with an extended persistence context (PC) would work for the 1st parsed file, but I have no idea what should happen from the 2nd file on.. Indeed, for the 1st file the PC will be created and propagated from CatalogBuilder to Cache, which will then use the same PC. But after build() returns, the PC of CatalogBuilder should (I guess) be removed and re-created during the succesive parsing, although the PC of Cache should stay "alive": shouldn't in this case an exception being thrown? Another problem is what to do when the Cache bean is passivated. Currently I get the exception:
"passivateEJB(), Exception caught ->
java.io.IOException: java.io.IOException
at com.sun.ejb.base.io.IOUtils.serializeObject(IOUtils.java:101)
at com.sun.ejb.containers.util.cache.LruSessionCache.saveStateToStore(LruSessionCache.java:501)"
Hence, I have no Idea how to implement my cache.. Can you please tell me how would you solve the problem?
Many thanks!
Bye

Hi Chris,
thanks for your reply!
I've tried to add the following into persistence.xml (although I've read that eclipseLink uses L2 cache by default..):
<shared-cache-mode>ALL</shared-cache-mode>
Then I replaced the Cache bean with a stateless bean which has methods like
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Genre genre = genreDAO.findByName(genreName);
if (genre!=null){
return genre;
genre = //Build new genre object
genreDAO.persist(genre);
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As far as I undestood, the shared cache should automatically store the genre and avoid querying the DB multiple times for the same genre, but unfortunately this is not the case: if I use a FINE logging level, I see really a lot of SELECT queries, which I didn't see with my "home made" Cache...
I am really confused.. :(
Thanks again for helping + bye

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Hi,
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Thanks.

ok thank you.
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After installing B1i on a Windows SERVER 2008, and setting the B1i Server address field on SAP Business One client as:
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XCE129 The IPO-Step to create a cached authentication config-node for is not known: /vP.001sap0004.in_HCSX/com.sap.b1i.vplatform.runtime/INB_HT_CALL_SYNC_XPT/INB_HT_CALL_SYNC_XPT.ipo/proc
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[Guide Deleted 31 OCT 2011 - Contained Out of Date Information]
Eddy
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Quote from: slicksickwilly on 22-August-06, 11:47:07
I also play WoW.. I get the stuttering too. I cant completely get rid of it but i got it down to a minimum. If i read your post right you have 1gig of ram.. Same here. WoW runs best on 2 gigs. When you hearth into IF or ride the gryphon there are so many new items/textures loading that your pagefile is working overtime hence the hard drive light is in contant flicker. The best solution as i said is to get 2 gigs of ram.. Another solution that i used that seemed to help is to set my pagefile to a diff hard drive. I run 2 Seagates 8meg cache 7200 rpm and disabled pagefile on drive c and put it on drive f. By putting it on another drive it will run faster with less hickups as you utilize both drives for better performance instead of one. If you want to try it let me know ill tell you how..
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Edited by: tom_ex on 2009-02-17 16:58

Hi Tom,
I haven't used lwjgl, so hope the following helps:
1- What does it matter if it takes 70ms. Your windows will be created once. At that point juste create the texture for that window and store it until you destroy the window. The penalty hit is 70ms but only at the initialization.
2- You are drawing a pixel at a time for everything. Why don't you calculate the area of the corners and only draw the corners a pixel at a time. For the rest, draw some filled polygons.
3- The java Graphics object has method fill methode that can take any Shape object. Why don't you use that?
I would use a combination of 3 and 1.
Hope that helps.
Ekram
Edited by: ekram_rashid on Feb 18, 2009 2:21 PM

Using disk images for learning games?

Hello, I've 2 g3 imacs running 9.2.2, and they are for the grandkids to use learning games on.
The kids are very hard on the software disks. When I found out about disk images I made them up, now to install them properly. The games are installed, but where to store the disk images? The desk top icons for the games will work after the disk images have been double clicked and the mounted disk image appears on the desktop, but when the imacs are turned off the mounted disk image is lost. How or where does one put the disk images in a safe place so the kids don't get at them, and the disks are mounted every time, without actually starting, when the Mac is started? Start up menu?
I'm planning on multiple accounts with them having a standard account with game privileges so they don't mess the whole thing up. If their accounts get too messed up for me to repair I figured on maybe deleting the account and opening up a new one? Any Ideas are very welcome.
Thank you,
EZ

Hi, EZ -
You're quite welcome.
I had a thought with regard to the disk image files. Are they in a .smi format, or are they in a .img format?
The .img format requires the assistance of the Disk Copy utility in order to mount the image. This is the standard format generated by the user version of Disk Copy. It requires that Disk Copy be available to Finder to act as a helper app in order to mount the image.
The .smi format does not - .smi stands for Self-Mounting Image. The user version of Disk Copy can not make this format; but I have seen a utility to convert .img format to .smi format. The slight advantage with this format is that Disk Copy does not need to be available to Finder.
In both cases the default is to run a checksum verification before the image is finally mounted. The delay caused by this verification can be inconvenient - verification is intended to confirm the integrity of the image after it has been copied, transported, or downloaded, but is usually not necessary when the image resides on a hard drive.
The checksum verification for .img file types can be removed. With the image not mounted, open Disk Copy. In Disk Copy's Preferences (Edit menu), uncheck the Verify Checksum item. Save the Preferences window. Then select Convert Image from the Image menu, navigate to the disk imge file from which you want to remove the verifiaction, select it and click the Open button. A new window will appear, similar to a Save As type window. Leave everything in that window untouched (unless you want to change the base name of the file - the extension .img should be left intact) and click the Save button. The image will be mounted, the original disk image file will be deleted, and a new disk image file created. Unfortunately creating the new image file takes quite a while since it is creating a new one, not actually modifying the old one - but it does get rid of the intrusion of the checksum verification requirement.
I verified on my G4/500 running OS 9.1 that a .img file (one I had made from a game CD years ago) dropped into the Startup Items folder will be mounted automatically at the end of the startup sequence. I also tested with an alias to the .img file, and it, too, worked fine - the disk image was mounted automatically at the conclusion of the startup sequence.
When you make the alias to the disk image file (the .img one), be sure you are placing it into the Startup Items folder, and not the Startup Items (disabled) folder.
If you have the machine set to use Simple Finder (which removes Finder's keyboard commands and many menu options for Finder), that may interfere with items in the Startup Items folder being run at startup. Or, it may not - I have not checked that.
*** Edit ***
I have verified that the alias to a .img file will mount the disk image even when the machine is booted using Simple Finder.
Another thought, related to Multiple Users - if you do decide to set up Multiple Users, and the disk images are of type .img, be sure to authorize Disk Copy for each of the accounts for which the disk images are to be mounted. If you have the disk image files in a .smi format, since Finder views that file type as being an application, you would need to authorize each of those disk image files for each account which is to have access to them.

Seeding the cache for all users

We are facing some performance issues (even after using aggregate tables) and are looking into seeding the cache for all users so that the dashboard pops up immediately.
So far I couldn't make it work. As Administrator I created an iBot to run a report for 1 month (dashboard has a dashboard prompt on the period) with Data Visibility set to 'Personalized (individual data visibility)' as I understood from the manual this is the way to seed the cache for all users. Now when I log on with my personal userid and set the prompt value to that specific period it is not using the cache.
Obviously destination was set to 'Oracle BI Server Cache' and cache has been turned on.
Does anyone have any suggestions ?

We are facing some performance issues (even after using aggregate tables) and are looking into seeding the cache for all users so that the dashboard pops up immediately.
So far I couldn't make it work. As Administrator I created an iBot to run a report for 1 month (dashboard has a dashboard prompt on the period) with Data Visibility set to 'Personalized (individual data visibility)' as I understood from the manual this is the way to seed the cache for all users. Now when I log on with my personal userid and set the prompt value to that specific period it is not using the cache.
Obviously destination was set to 'Oracle BI Server Cache' and cache has been turned on.
Does anyone have any suggestions ?

Usage of Object Cache for Java in J2EE apps

Hi,
we are investigating on whether we can use the Object Cache for Java
(OCS4J) for our requirements. The question we have come across is:
What is the designated way of integration for the Object cache to fit
into the J2EE environment? Unfortunately, although the current manuals
group OCS4J into the "Oracle Containers for J2EE Services Guide" and the
suggested package name for the whole thing in JSR 107 seems to be
javax.util.jcache, there is very little documentation on how the
designers would like J2EE programmers to use the cache from within a
J2EE app and all examples given are not from within a J2EE environment.
We are in particular thinking about a hierarchy of several cache
"compartments" (Region->Subregion->group) for different topics and using
the hierarchical name of the cache (region.subregion.group) as the
primary key for BMP Entity beans, each of them having their own
CacheAccess object. Then we would have an API of stateless Session beans
on top of that, which would be determining the cache "compartment", get
the appropriate Entity Bean with the Cache Access object and then do the
required operations on the cache.
But then we immediately run into the question of how the mapping between
Cache Objects and CacheAccess objects will be done etc.
So is there anybody that can give us any hints how to use the OCS4J in
an EJB scenario?
Thanks in advance for any help!
Andreas Loew
[email protected]

We have Java client requesting over HTTP to application server. We would like to cache some of the objects created by the servlet while serving the request. Can I use the OCS4J for caching the Java objects. Do I require any software or just copying the JAR file and importing the class would serve the purpose?
Regards
Arun

Creating a cache for a game?

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