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How to get value of Thread-local from current Thread?
I am trying to get the value of Thread-local from current Thread but can't find any help online.
Read the Javadoc for ThreadLocal. There are only 4 methods on ThreadLocal; the one you need is obviously ThreadLocal.get():
Returns the value in the current thread's copy of this thread-local variable.
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Imagine I have two async methods and a main method. In the main method, one is called in line of code 1 and another in line of code 2. I want the code to be blocked in line of code 3 because I need the results of those 2 methods.
Is this possible in Spring Boot? What could I use?
You can use completableFuture.
https://www.baeldung.com/java-completablefuture#Multiple
CompletableFuture.allOf() or CompletableFuture.join() ll help;
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Could I take the control of the buffer (BufferedWriter) to send the data before it is full?
edit: The scenario is that. We put String like "Luck" together with other Strings into the buffer (BufferedWriter), then onto a FileWriter. Well, the BufferWriter holds all the data until is full.
You are probably looking for the flush() method, which does exactly that.
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ProcessEngines.getDefaultProcessEngine()
return me null when I try init a new process in activiti engine.
Do you know what could be the reason ?
Taken from the Activi forums user frederikheremans:
As stated in the Javadoc for ProcessEngines, this class is used by a
ServletContextListener, which calls the ProcessEngines.init(). The
init() will scan the classpath for activiti.properties an tries to
build a ProcessEngine for each file found.
The getDefaultProcessEngine() only works [if] the ProcessEngines.init()
has been called (by
org.activiti.impl.servlet.listener.ProcessEnginesServletContextListener
or by calling it yourself once) and if a process-engine with name
'default' is available.
The OP of the thread I got that from stated that he too received null from getDefaultProcessEngine. Hope that helps.
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Suppose we possess 2 serialized copies of an object.
Q1. I wanted to know whether the state of an object can be compared with its prior state.
Q2 If yes, can we find out precisely which class variables have been changed ?
Q3 If the answer to the 2nd question is yes, can we perform some sort of "synchronization" to change only the modified class variables ?
One way to check state of object is using
PropertyChangeSupport and PropertyChangeListener
You can go through the below link for how to write PropertyChangeListener for particular bean.
http://docs.oracle.com/javase/tutorial/uiswing/events/propertychangelistener.html
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I have loadGraphics() function in my app. It takes a lot of time to be executed. I want to make loading screen, while this function is running. Can I create inside callback, which would have notified me about the function succeeds? Thanks in advance.
Yes. Just create a private boolean that can only be accessed in the class, setting it to false initially. Before beginning that loadGraphics(), just start a basic thread that has a callback in it if that boolean is true.
Then just add a statement at the end of loadGraphics() that sets the boolean to true.