I made a plugin for bukkit 1.2.5 (to used on a tekkit server) that alerted players when someone (for example) tried to place down some tnt which is why I using block IDs.
Now that I'm trying to use an updated version of bukkit (1.7.2-R0.3 to be exact) it seems that the getTypeId() method is no longer working. I've googling/searching in the javadoc for a solution but I can't find one.
// Checks if the block placed has the id of 46 / tnt
if (e.getBlock().getTypeId() == 46) {
e.setCancelled(true);
Server server = Bukkit.getServer();
server.broadcastMessage("Someone tried to place some tnt down");
}
How do I get it to work in 1.7.2 now that getTypeId() is deprecated
You can still use the getTypeId() method for Blocks or the getId() method for the Block Material despite the fact that they are deprecated. If you add the #SuppressWarnings("deprecation") annotation to your listener method your IDE should not complain about using the deprecated methods. You can also alternatively use the non-deprecated Material enum directly with event.getBlock().getType() == Material.TNT.
Related
Aside from recompiling rt.jar is there any way I can replace the currentTimeMillis() call with one of my own?
1# The right way to do it is use a Clock object and abstract time.
I know it but we'll be running code developed by an endless number of developers that have not implemented Clock or have made an implementation of their own.
2# Use a mock tool like JMockit to mock that class.
Even though that only works with Hotspot disabled -Xint and we have success using the code bellow it does not "persist" on external libraries. Meaning that you'd have to Mock it everywhere which, as the code is out of our control, is not feasible. All code under main() does return 0 milis (as from the example) but a new DateTime() will return the actual system millis.
#MockClass(realClass = System.class)
public class SystemMock extends MockUp<System> {
// returns 1970-01-01
#Mock public static long currentTimeMillis() { return 0; }
}
3# Re-declare System on start up by using -Xbootclasspath/p (edited)
While possible, and though you can create/alter methods, the one in question is declared as public static native long currentTimeMillis();. You cannot change it's declaration without digging into Sun's proprietary and native code which would make this an exercise of reverse engineering and hardly a stable approach.
All recent SUN JVM crash with the following error:
EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00000, pid=4668, tid=5736
4# Use a custom ClassLoader (new test as suggested on the comments)
While trivial to replace the system CL using -Djava.system.class.loader JVM actually loads up the custom classLoader resorting to the default classLoader and System is not even pushed trough the custom CL.
public class SimpleClassLoader extends ClassLoader {
public SimpleClassLoader(ClassLoader classLoader) {
super(classLoader);
}
#Override
public Class<?> loadClass(String name) throws ClassNotFoundException {
return super.loadClass(name);
}
}
We can see that java.lang.System is loaded from rt.jar using java -verbose:class
Line 15: [Loaded java.lang.System from C:\jdk1.7.0_25\jre\lib\rt.jar]
I'm running out of options.
Is there some approach I'm missing?
You could use an AspectJ compiler/weaver to compile/weave the problematic user code, replacing the calls to java.lang.System.currentTimeMillis() with your own code. The following aspect will just do that:
public aspect CurrentTimeInMillisMethodCallChanger {
long around():
call(public static native long java.lang.System.currentTimeMillis())
&& within(user.code.base.pckg.*) {
return 0; //provide your own implementation returning a long
}
}
I'm not 100% sure if I oversee something here, but you can create your own System class like this:
public static class System {
static PrintStream err = System.err;
static InputStream in = System.in;
static PrintStream out = System.out;
static void arraycopy(Object src, int srcPos, Object dest, int destPos, int length) {
System.arraycopy(src, srcPos, dest, destPos, length);
}
// ... and so on with all methods (currently 26) except `currentTimeMillis()`
static long currentTimeMillis() {
return 4711L; // Your application specific clock value
}
}
than import your own System class in every java file. Reorganize imports in Eclipse should do the trick.
And than all java files should use your applicatikon specific System class.
As I said, not a nice solution because you will need to maintain your System class whenever Java changes the original one. Also you must make sure, that always your class is used.
As discussed in the comments, it is possible that option #3 in the original question has actually worked, successfully replacing the default System class.
If that is true, then application code which calls currentTimeMillis() will be calling the replacement, as expected.
Perhaps unexpectedly, core classes like java.util.Timer would also get the replacement!
If all of the above are true, then the root cause of the crash could be the successful replacement of the System class.
To test, you could instead replace System with a copy that is functionally identical to the original to see if the crashes disappear.
Unfortunately, if this answer turns out to be correct, it would seem that we have a new question. :) It might go like this:
"How do you provide an altered System.currentTimeMillis() to application classes, but leave the default implementation in place for core classes?"
i've tried using javassist to remove the native currentTimeMills, add a pure java one and load it using bootclasspath/p, but i got the same exception access violation as you did. i believe that's probably because of the native method registerNatives that's called in the static block but it's really too much to disassemble the native library.
so, instead of changing the System.currentTimeMills, how about changing the user code? if the user code already compiled (you don't have source code), we can use tools like findbugs to identify the use of currentTimeMillis and reject the code (maybe we can even replace the call to currentTimeMills with your own implementation).
We are currently writing a module for Sitecore and have ran into a problem.
We have a pipeline in which we do the following check:
if (Sitecore.Context.PageMode.IsExperienceEditor)
{
return;
}
The problem is that one of our clients are running and older version of Sitecore (8.0 update 5) where the property IsExperienceEditor does not exist yet. See Sitecore release notes for next update where it is introduced.
To quickly fix the error we used the older deprecated property which is this:
if (Sitecore.Context.PageMode.IsPageEditor)
{
return;
}
Now the question is, is there any way in which we can test for the Sitecore version so we can have backwards compatibility in the module?
You can use the code which is executed in Sitecore in background of both properties mentioned by you:
if (Sitecore.Context.Site.DisplayMode == Sitecore.Sites.DisplayMode.Edit)
{
return;
}
I know that using Sitecore.Context.PageMode.IsExperienceEditor (or Sitecore.Context.PageMode.IsPageEditor) is more elegant, but in a situation when you need to support both old and new Sitecore versions, that's sounds like a good option.
The deprecated property of IsPageEditor is still present specifically for the purpose of backward compatibility. IsExperienceEditor is just a renamed property that does the same thing that IsPageEditor does.
However you can check for the existence of a property like this:
public static bool HasProperty(this object obj, string propertyName)
{
return obj.GetType().GetProperty(propertyName) != null;
}
Another option is to make two different versions of the module, if the implementation becomes significantly different for the different versions of Sitecore.
It is possible to automatically generate Sitecore templates just coding models? I'm using Sitecore 8.0 and I saw Glass Mapper Code First approach but I cant find more information about that.
Not sure why there isn't much info about it, but you can definitely model/code first!. I do it alot using the attribute configuration approach like so:
[SitecoreType(true, "{generated guid}")]
public class ExampleModel
{
[SitecoreField("{generated guid}", SitecoreFieldType.SingleLineText)]
public virtual string Title { get; set; }
}
Now how this works. The SitecoreType 'true' value for the first parameter indicates it may be used for codefirst. There is a GlassCodeFirstDataprovider which has an Initialize method, executed in Sitecore's Initialize pipeline. This method will collect all configurations marked for codefirst and create it in the sql dataprovider. The sections and fields are stored in memory. It also takes inheritance into account (base templates).
I think you first need to uncomment some code in the GlassMapperScCustom class you get when you install the project via Nuget. The PostLoad method contains the few lines that execute the Initialize method of each CodeFirstDataprovider.
var dbs = global::Sitecore.Configuration.Factory.GetDatabases();
foreach (var db in dbs)
{
var provider = db.GetDataProviders().FirstOrDefault(x => x is GlassDataProvider) as GlassDataProvider;
if (provider != null)
{
using (new SecurityDisabler())
{
provider.Initialise(db);
}
}
}
Furthermore I would advise to use code first on development only. You can create packages or serialize the templates as usual and deploy them to other environment so you dont need the dataprovider (and potential risks) there.
You can. But it's not going to be Glass related.
Code first is exactly what Sitecore.PathFinder is looking to achieve. There's not a lot of info publicly available on this yet however.
Get started here: https://github.com/JakobChristensen/Sitecore.Pathfinder
StructureMap has a super-useful debug method on the Container class called WhatDoIHave()
It shows every type in the container along with its lifecycle, guid and a bunch of other info. It's useful for debugging.
There's some info here:
http://jeremydmiller.com/2014/02/18/structuremap-3-is-gonna-tell-you-whats-wrong-and-where-it-hurts/
Does DryIOC have an equivalent debug feature?
(I'm the creator of DryIoc).
You can use container.GetServiceRegistrations() to get registration infos as #fyodor-soikin suggested.
But at the latest version (2.0.0-rc3build339) I have added VerifyResolutions method that may help you to diagnose potential resolution problems, including missing registrations as well. Here the wiki explaining it.
Example from the wiki:
// Given following SUT
public class RequiredDependency {}
public class MyService { public MyService(RequiredDependency d) {} }
// Let's assume we forgot to register RequiredDependency
var container = new Container();
container.Register<MyService>();
// Find what's missing
var results = container.VerifyResolutions();
Assert.AreEqual(1, results.Length);
Verify result is array of ServiceRegistrationInfo and ContainerException KeyValuePairs. In this example the registration info will be:
MyNamespace.MyService registered as factory {ID=14, ImplType=MyNamespace.MyService}
And the exception will be:
DryIoc.ContainerException: Unable to resolve MyNamespace.RequiredDependency as parameter "d"
in MyNamespace.MyService.
Where no service registrations found
and number of Rules.FallbackContainers: 0
and number of Rules.UnknownServiceResolvers: 0
Update:
The functionality is available in latest stable DryIoc 2.0.0.
I'd like to get list of all Upgrade codes of all installed products on Windows box. The question is: is there a dedicated MSI function to address this request?
There is MsiEnumProducts() that enumerates all installed products and MsiEnumRelatedProducts() to enumerate all products for the given Upgrade code. But I can't find a function to get all Upgrade codes in the system.
The workaround I can imagine is use MsiEnumProducts() to get list of all installed products, open each with MsiOpenProduct() function and read "UpgradeCode" property with MsiGetProductProperty(). But this should be very slow due to multiple MsiOpenProduct() calls.
I believe MsiEnumProducts loop with MsiOpenProduct and then MsiGetProductProperty is the correct official sequence. If you really need faster and are willing to bypass the API's you could read the registry directly at HKCR\Installer\UpgradeCodes. You'll have to reverse the Darwin Descriptors though. This isn't technically supported but the reality is these keys have been there for 16 years and MSFT has been doing ZERO development on The Windows Installer. Ok, maybe they updated the version number and removed ARM support in Windows 10 LOL.
FWIW, I like to use C# not C++ but the concept is the same. The following snippet ran on my developer machine in about 2 seconds.
using System;
using Microsoft.Deployment.WindowsInstaller;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
foreach (var productInstallation in ProductInstallation.AllProducts)
{
using(var database = new Database(productInstallation.LocalPackage, DatabaseOpenMode.ReadOnly))
{
Console.WriteLine(database.ExecutePropertyQuery("UpgradeCode"));
}
}
}
}
}
According to the DTF documentation, ProductInstallation.AllProducts uses MsiEnumProducts. The Database class constructor is using MsiOpenDatabase and ExecutePropertyQuery is a higher level call that basically abstracts doing a SELECT Value from Property WHERE Property = '%s'. So it'll be calling APIs to create, execute and fetch results from views. All these classes implement IDisposable to call the correct APIs to free resources also.
Ya... that's why I love managed code. :)