I am very new to rockdb and will be using the rocksdb in my application as a lookup service. Does the rockDBjava library api provided contain the database itself, I mean is it not necessary to install rocksDB database separately.
I tried running the code using library and see some files created in the db path I mentioned in code, so not sure how exactly it works and if I need to install DB separately or if the library stores data in the directory and it itself acts as database?
No, you should not need to install RocksDB separately if you already have RocksJava working. They're not very clear on stating that, but if you look at the wiki in their Git repo you'll find this:
RocksJava is structured in 3 layers:
The Java classes within the org.rocksdb package which form the
RocksJava API. Java users only directly interact with this layer.
JNI code written in C++ that provides the link between the Java API
and RocksDB.
RocksDB itself written in C++ and compiled into a native library which
is used by the JNI layer.
That third point is basically their way of saying that RocksDB itself is one of the layers of RocksJava.
Related
Full Error:
transactions.TransactionBuilder. - The transaction currently built is missing an attachment for class: com/gibtn/corda/printutilities/PrintLedgerTransaction. Attempted to find a suitable attachment but could not find any in the storage.
This has been asked here and here but I hope to get better clarification.
Problem:
I have built a set of libraries to perform common tasks in my Flows that I include in all my CorDapps. For now I just copy the JARs into each project, make some changes to the gradle files and everything works great.
I recently put together a small library for performing common tasks in Contracts and added the JAR the same way.
This works fine with MockNodes. But when I test with real nodes I will get this error in the CRaSH shell and the transaction will fail with a NoClassDefFoundError exception.
Question:
Is what I am doing even possible? Or do I always have to keep my utility classes inside the Contracts module in IntelliJ so they are bundled together with the Contracts into a single JAR? That way when the node starts the JAR (containing the Contracts and any utilities) is added to Attachment storage as a single Attachment.
I found a way to solve this. It's a bit dirty but initial testing seems to work. I just created a blank class in my utilities JAR that implements Contract. It's verify() method is empty. Now when the Corda node starts it sees this Contract and adds the JAR to Attachment storage. So from the CRaSH shell if I run:
attachments trustInfo
...my utility JAR will be listed (it wasn't before). I see when I use one of the utility methods in a Contract the utility JAR will be included as a separate Attachment in the WireTransaction.
I'm not crazy about this solution and will probably stop using a utility JAR for Contracts. I'll go back to copying the classes into each project. Nevertheless there is a way to do it. I would just need a more experienced Corda developer to give it their blessing before I'd go forward into production with it.
I am trying to compile SQLite into a library which another application is then going to link against. I am not able to compile SQLite directly into that application for reasons which are beyond the scope of this question.
However, I need a VFS to be available which by default is not. In trying to figure out how to get this working I am trying to get the vfstrace shim to be made available to the application which is linking to SQLite. This will easily prove that it is working as I can log SQLite VFS activity from the shim and see that it is actually being used when the application calls SQLite.
How do I do this? All the examples I have found show the case of when you have a source file (such as shell.c) and you compile it, sqlite3.c and test_vfstrace.c to produce an executable. However, I do not have this luxury. I could compile sqlite.c and test_vfstrace.c and generate the libsqlite3.so library file, but there is no "main" function in which to call vfstrace_register so that the VFS is actually available. Is there some other hook for the library case where I can set this up? If no, how do I make a new VFS available?
SQLite is initialized via the sqlite3_initialize() function, which is called automatically when various functions such as sqlite3_open() are called by the user, although it is a no-op on subsequent invocations. This function in turn calls the OS specific initialization function sqlite3_os_init(). This is the function that initializes all the VFSes that are built into SQLite.
For the example VFS given, append test_vfstrace.c to the amalgamation and then put a call like this in sqlite3_os_init() right before the return statement:
vfstrace_register("trace",0,(int(*)(const char*,void*))fputs,stderr,1);
Then build the library with these modifications.
The last parameter's value of 1 will make this VFS be the default, so if you don't want trace messages printed for every SQLite operation performed via code linked the library you just created change this to 0 and explicitly specify this VFS when opening a database to trace the calls for. For instance, specify the SQLITE_USE_URI compile time option, and then pass a filename of the form: "file:database.db?vfs=unix" where "database.db" is the actual name of the file to open.
I am novices to the field of Identity and Access management.
Till now I know, Sail point has provided the some direct connectors to integrate the known systems like LDAP, HR systems, OIM, Databases..
And sailpoint also provided the support for disconnected applications with the use of Custom connectors.
Here, My question is how to develop a custom connector..?
I do not have jar file provided by sailpoint which contain "AbstractConnector" class.
So that I can write my own class and develop..?
I also so not understand, what to do with that class?(if i have a jar)
How sailpoint will refer to that class..
Do we need to deploy that class to somewhere...
Here I am expecting the complete flow to develop and deploy the custom connector..
If anyone is working please help..
If you unzip your identityiq.war, you'll find a JAR file called WEB-INF/lib/connector-bundle.jar. This is the JAR where you'll find AbstractConnector. Once you've written your connector code, you will need to compile it and bundle it into a JAR file, which you will place into WEB-INF/lib.
Finally, you will need to update the ConnectorRegistry object (under Configuration on the debug screen) to reference the new class, which will make it available as an Application type. If it has custom connection parameters (as most do), you will also need an xhtml page that will be embedded into the Sailpoint UI to prompt the user configuring the Application.
If you have Compass access, they have a whitepaper called Custom Connectors that you will find helpful.
All that said, I encourage you to try to find a way to use an out-of-box connector if possible.
Most of the times it will be better if you use the DelimitedFile connector, you can import a CSV of identity data, and make it work within Sailpoint's workflow. You will be able to map fields, correlate accounts and create multi-valued group memberships rapidly. Of course, this means that Sailpoint will not be connected directly to the application, and you will have to develop a workflow to extract the identities and upload them. But at least, you can integrate without going the Custom Connector way.
I have doubt regarding windows phone 8 application development. The database using sqlite for windows phone 8 is pre-loaded into the application or it should be created dynamically at the time of installation in windows phone..? and if it is pre-loaded then how to create the database.db file..?? and also if it is dynamically created, what is the procedure to create dynamically...??
I would say, pre-loaded into the application is the very common way.
Take a look at this article, I think the steps to accomplish your task are quite the same: http://wp.qmatteoq.com/import-an-already-existing-sqlite-database-in-a-windows-8-application/
The first step is to copy your database in to the Visual Studio project and, from the Properties window, set the Build action to Content.
Once you’ve done this operation, you’ll be able to access to the files embedded in your project thanks to the Package.Current.InstalledLocation object that is available in the Windows.ApplicationModel namespace.
The InstalledLocation’s type is StorageFolder, which is the base class of all the folders mapping in WinRT: for this reason, it exposes all the standard methods to interact with the storage, like getting a file or a folder. This way we can use the GetFileAsync method to get a reference to the database embedded into the project and, after that, using the CopyAsync method we can copy it into the local storage of the application. We can copy it in the root of the local storage (like in the following example) or in a specific folder, by getting a reference to it first using the GetFolderAsync method.
For those who are not able to work with sqlite I would like to suggest them to follow this link : http://dotnetslackers.com/articles/silverlight/Windows-Phone-7-Native-Database-Programming-via-Sqlite-Client-for-Windows-Phone.aspx and when you are dumping the data into the project .. you just need to change the properties of the "database1.sqlite" i.e. Build Action = resource . Thats all you need to do ..
How can I able to find the usage of default tables available in drupal.
Is there any documentation available?
For example: there is a table called node. I need to know what is the usage of it and how it acts.
Any suggestions or answers will be helpful and grateful.
Your question is not very clear (the term "usage" is quite ambiguous), but you could install the Devel module. After setting it up it will show, for every page loaded (home page included), which SQL queries are run.
Every module can add tables to the database. A default Drupal install uses core modules, either required ones or those installed as dependencies of the default installation profile. These modules install their own tables.
Each module declares its tables in its implementation of hook_schema. The Schema module use the information from the implementations of this hook to provide a schema documentation.
Most of the time, you shouldn't directly access the database but use the API provided by the modules managing the data. Tables are usually considered private for their modules. New release of a module may change its schema in an incompatible way. Using API is much safer. Unfortunately, sometimes database access is the only option. In these cases, implementation of a data access layer between your code and the database is advised.