By using JNDI (Java Naming and Directory Interface) to obtain the database connection, the connection is fully managed by the Servlet Container and the configuration can be managed outside the war deployment. This also allows more control over the connection parameters than what is provided by the db.properties file.
The snippet below adds 2 listeners to a process-definition. The first listener will receive events of any type, with a listener implementation based on a fully-qualified class name. The second listener is only notified when a job is successfully executed or when it failed, using a listener that has been defined in the beans property of the process engine configuration.
A compensation boundary event has a different activation policy from other boundary events. Other boundary events like for instance the signal boundary event are activated when the activity they are attached to is started. When the activity is left, they are deactivated and the corresponding event subscription is cancelled. The compensation boundary event is different. The compensation boundary event is activated when the activity it is attached to completes successfully. At this point, the corresponding subscription to the compensation events is created. The subscription is removed either when a compensation event is triggered or when the corresponding process instance ends. From this, it follows:
Note: If compensation is thrown within a scope which contains a subprocess and the subprocess contains activities with compensation handlers, compensation is only propagated to the subprocess if it has completed successfully when compensation is thrown. If some of the activities nested inside the subprocess have completed and have attached compensation handlers, the compensation handlers are not executed if the subprocess containing these activities is not completed yet. Consider the following example:
waitForCompletion=\"false\" is currently unsupported. When compensation is triggered using the intermediate throwing compensation event, the event is only left, after compensation completed successfully.
The mappings are checked in order, from top to bottom and the first found match will be followed, except for the default map. Default map is selected only after all maps are unsuccessfully checked.Only the first map with no class will be considered as default map. includeChildExceptions is ignored for default Map.
By setting this feature the specified Camel route is activated asynchronously by the Activiti job executor. When you define a queue in the Camel route the Activiti process will continue with the activities after the Camel service task. The Camel route will be executed fully asynchronously from the process execution. If you want to wait for a response of the Camel service task somewhere in your process definition, you can use a receive task.
The rollback is performed using compensation. If a cancel event is thrown in the scope of a transaction, the effects of all activities that executed successfully and have a compensation handler are compensated.
Consistency on top of ACID transactions and optimistic concurrency: A bpmn transaction guarantees consistency in the sense that either all activities compete successfully, or if some activity cannot be performed, the effects of all other successful activities are compensated. So either way we end up in a consistent state. However, it is important to recognize that in Activiti, the consistency model for bpmn transactions is superposed on top of the consistency model for process execution. Activiti executes processes in a transactional way. Concurrency is addressed using optimistic locking. In Activiti, bpmn error, cancel and compensation events are built on top of the same acid transactions and optimistic locking. For example, a cancel end event can only trigger compensation if it is actually reached. It is not reached if some undeclared exception is thrown by a service task before. Or, the effects of a compensation handler cannot be committed if some other participant in the underlying ACID transaction sets the transaction to the state rollback-only. Or, when two concurrent executions reach a cancel end event, compensation might be triggered twice and fail with an optimistic locking exception. All of this is to say that when implementing bpmn transactions in Activiti, the same set of rules apply as when implementing \"ordinary\" processes and subprocesses. So to effectively guarantee consistency, it is important to implement processes in a way that does take the optimistic, transactional execution model into consideration.
How does Activiti address this problem Activiti performs optimistic locking. Whenever we take a decision based on data that might not be current (because another transaction might modify it before we commit, we make sure to increment the version of the same database row in both transactions). This way, whichever transaction commits first wins and the other ones fail with an optimistic locking exception. This solves the problem in the case of the process discussed above: if multiple executions arrive at the parallel join concurrently, they all assume that they have to wait, increment the version of their parent execution (the process instance) and then try to commit. Whichever execution is first will be able to commit and the other ones will fail with an optimistic locking exception. Since the executions are triggered by a job, Activiti will retry to perform the same job after waiting for a certain amount of time and hopefully this time pass the synchronizing gateway.
full: This is the highest level of history archiving and hence the slowest. This level stores all information as in the audit level plus all other possible details, mostly this are process variable updates.
SQLite is a C-language library that implements asmall,fast,self-contained, high-reliability,full-featured,SQL database engine.SQLite is the most used database engine in the world.SQLite is built into all mobile phones and most computers andcomes bundled inside countless other applications that peopleuse every day.More Information...The SQLite file format is stable, cross-platform, andbackwards compatible and the developers pledge to keep itthat way through the year 2050. SQLite databasefiles are commonly used as containers to transfer rich content between systemsand as a long-term archival format for data.There are over 1 trillion (1e12)SQLite databases in active use.SQLite source codeis in the public-domain and is free to everyone to use for any purpose.Latest ReleaseVersion 3.40.1 (2022-12-28).DownloadPrior ReleasesCommon Links Features When to use SQLite Getting Started Try it live! Prior Releases SQL Syntax Pragmas SQL functions Date & time functions Aggregate functions Window functions Math functions JSON functions C/C++ Interface Spec Introduction List of C-language APIs The TCL Interface Spec Quirks and Gotchas Frequently Asked Questions Commit History Bugs News Ongoing development and support of SQLite is made possible in partby SQLite Consortium members, including:
A fully normalized database allows its structure to be extended to accommodate new types of data without changing existing structure too much. As a result, applications interacting with the database are minimally affected.
One cannot simply change the data type of a column not thinking about blocking issues. In most cases, you risk getting a full table rewrite when you issue a simple alter table t1 alter column c2 type int8;.
What to do with it Create a new column, define a trigger to mirror values from the old one, backfill (in batches, controlling dead tuples and bloat), and then switch your app to use the new column, dropping the old one when fully switched.
As was already mentioned, before Postgres 11, adding a column with default was a non-trivial and data change intensive task (by default implying a full table rewrite). If you missed that feature somehow, read about it, for example, in \"A Missing Link in Postgres 11: Fast Column Creation with Defaults\" by @brandur.
As we already discussed in Case 13, a failed CREATE INDEX CONCURRENTLY leaves an invalid index behind. If migration scripts don't expect that, fully automated retries are going to be blocked, so manual intervention would be required. To make retries fully automated, before running CREATE INDEX CONCURRENTLY, we should check if pg_indexes:
The basic usage of cron is to execute a job in a specific time as shown below. This will execute the Full backup shell script (full-backup) on 10th June 08:30 AM. Please note that the time field uses 24 hours format. So, for 8 AM use 8, and for 8 PM use 20.
SQL date format functions like the DateDiff SQL function and DateAdd SQL Function are oft used by DBAs but many of us never took the time to fully understand these extremely useful features. For professionals just getting started with SQL Server, these functions are some of the first to become familiar with. So hopefully this article will have a little something for everyone across the skill spectrum
If you have customized any of the templates you need to carefully review the changes that have been made to the templatesto decide if you need to apply these changes to your customized templates. Most likely you will need to apply the samechanges to your customized templates. If you have not customized any of the listed templates you can skip this section.
From this comparison it is easy to identify that the first change (Hello world!!) was a customization, while thesecond change (if pageRedirectUri) is a change to the base theme. By copying the second change to your custom template,you have successfully updated your customized template.
The UserInfo endpoint is now returning error responses fully compliant with RFC 6750 (The OAuth 2.0 Authorization Framework: Bearer Token Usage). Error code and description (if available) are provided as WWW-Authenticate chal