As it happens I was just reading about this this morning on my way to work in Java Concurrency In Practice by Brian Goetz. Basically he says you should do one of three things . Propagate the InterruptedException - Declare your method to throw the checked InterruptedException so that your caller has to deal with it.. Restore the Interrupt - Sometimes you cannot throw InterruptedException.
Example: Your method waits for a value from the network to finish the computation and return a result. If the blocking network call throws an InterruptedException your method can not finish computation in a normal way. You let the InterruptedException propagate.. int computeSum(Server server) throws InterruptedException { // Any InterruptedException thrown below is propagated int a = server ...
This is done to keep state.. When you catch the InterruptedException and swallow it, you essentially prevent any higher-level methods/thread groups from noticing the interrupt. Which may cause problems. By calling Thread.currentThread().interrupt(), you set the interrupt flag of the thread, so higher-level interrupt handlers will notice it and can handle it appropriately.
Here is how it is designed in Java. There is a flag called Interrupt status flag in every java thread that we can set from the outside i.e. parent or main thread.
In other words, parent thread will ask child thread to stop by calling interrupt () method, but child thread will just ignore these calls. An interrupt is an indication to a thread that it should stop what it is doing and do something else.
If we are using JDK 1.0 , we can call Thread's deprecated method stop () to terminate it. Using stop () is incredibly dangerous, as it will kill your thread even if it is in the middle of something important. There is no way to protect yourself, so if you spot code that uses stop (), you should frown.
interrupted () : It is static method and checks the interrupt status flag of current thread. When we call interrupted (), the flag is returned and immediately set to false .
In Java, thread starts its execution when we call start () method on Thread object. It internally calls overridden run () method. Thread is said to be terminated when execution of run () method completes.
In real-time applications, you may come across a scenario where you need to use multiple threads to complete the task and there may be a requirement to forcefully shutdown all your threads on triggering of some event.
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Threads can be interrupted, and when a thread is interrupted, it will throw InterruptedException.
For instance, when a thread is sleeping or waiting on an I/O operation, and it receives the interrupt, we can close any resources before terminating the thread.
The interrupt mechanism is implemented using a flag known as the interrupt status. Each thread has a boolean property that represents its interrupted status. Invoking Thread.interrupt () sets this flag. When a thread checks for an interrupt by invoking the static method Thread.interrupted (), the interrupt status is cleared.
In other words, some code has called the interrupt () method on our thread. It's a checked exception, and many blocking operations in Java can throw it.
Multithreading is a process of executing two or more threads simultaneously. A Java application starts with a single thread – called the main thread – associated with the main () method. This main thread can then start other threads. Threads are lightweight, which means that they run in the same memory space.
An interrupt is an indication to a thread that it should stop what it's doing and do something else. More specifically, if we're writing some code that will be executed by an Executor or some other thread management mechanism, we need to make sure that our code responds promptly to interrupts. Otherwise, our application may lead to a deadlock.
We can allow the InterruptedException to propagate up the call stack, for example, by adding a throws clause to each method in turn and letting the caller determine how to handle the interrupt. This can involve our not catching the exception or catching and rethrowing it. Let's try to achieve this in an example:
The interrupt mechanism is implemented using a flag known as the interrupt status. Each thread has a boolean property that represents its interrupted status. Invoking Thread.interrupt () sets this flag. When a thread checks for an interrupt by invoking the static method Thread.interrupted (), the interrupt status is cleared.
In other words, some code has called the interrupt () method on our thread. It's a checked exception, and many blocking operations in Java can throw it.
Multithreading is a process of executing two or more threads simultaneously. A Java application starts with a single thread – called the main thread – associated with the main () method. This main thread can then start other threads. Threads are lightweight, which means that they run in the same memory space.
An interrupt is an indication to a thread that it should stop what it's doing and do something else. More specifically, if we're writing some code that will be executed by an Executor or some other thread management mechanism, we need to make sure that our code responds promptly to interrupts. Otherwise, our application may lead to a deadlock.
Threads can be interrupted, and when a thread is interrupted, it will throw InterruptedException.
We can allow the InterruptedException to propagate up the call stack, for example, by adding a throws clause to each method in turn and letting the caller determine how to handle the interrupt. This can involve our not catching the exception or catching and rethrowing it. Let's try to achieve this in an example:
Custom exceptions provide the flexibility to add attributes and methods that are not part of a standard Java exception. Hence, it's perfectly valid to handle the interrupt in a custom way, depending on the circumstances.