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Canceling the parent and child job
Devrath edited this page Aug 29, 2022
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8 revisions
class MainActivity : AppCompatActivity() {
val parentScope = CoroutineScope(Job() + Dispatchers.Default)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
Log.d("hello", "Starting point")
val job1 = parentScope.launch {
Log.d("hello", "Starting JOB-1")
delay(2000)
Log.d("hello", "Ending JOB-1")
}.invokeOnCompletion {
if(it is CancellationException){
Log.d("hello", "Canceled JOB-1")
}else{
Log.d("hello", "Completed JOB-1")
}
}
}
}
Output
2022-08-28 21:36:07.783 15604-15604/com.droid.test D/hello: Starting point
2022-08-28 21:36:07.817 15604-15643/com.droid.test D/hello: Starting JOB-1
2022-08-28 21:36:09.831 15604-15643/com.droid.test D/hello: Ending JOB-1
2022-08-28 21:36:09.832 15604-15643/com.droid.test D/hello: Completed JOB-1
class MainActivity : AppCompatActivity() {
val parentScope = CoroutineScope(Job() + Dispatchers.Default)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
Log.d("hello", "Starting point")
val job1 = parentScope.launch {
Log.d("hello", "Starting JOB-1")
delay(2000)
cancel("Canceling the co-routine")
delay(2000)
Log.d("hello", "Ending JOB-1")
}.invokeOnCompletion {
if(it is CancellationException){
Log.d("hello", "Canceled JOB-1: ${it.message}")
}else{
Log.d("hello", "Completed JOB-1")
}
}
}
}
Output
2022-08-28 21:39:58.005 15744-15744/com.droid.test D/hello: Starting point
2022-08-28 21:39:58.024 15744-15778/com.droid.test D/hello: Starting JOB-1
2022-08-28 21:40:00.033 15744-15778/com.droid.test D/hello: Canceled JOB-1: Canceling the co-routine
class MainActivity : AppCompatActivity() {
val exceptionHandler = CoroutineExceptionHandler { coroutineContext, throwable ->
Log.d("hello", "Caught Exception:-> ${throwable.message}")
}
val parentScope = CoroutineScope(Job() + Dispatchers.Default + exceptionHandler)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
Log.d("hello", "Starting point")
val job1 = parentScope.launch {
Log.d("hello", "Starting JOB-1")
delay(2000)
throw RuntimeException("Custom Runtime Exception")
Log.d("hello", "Ending JOB-1")
}.invokeOnCompletion {
if(it is CancellationException){
Log.d("hello", "Canceled JOB-1: ${it.message}")
}else{
Log.d("hello", "Completed JOB-1")
}
}
}
}
Output
2022-08-28 21:59:48.263 16084-16084/com.droid.test D/hello: Starting point
2022-08-28 21:59:48.277 16084-16118/com.droid.test D/hello: Starting JOB-1
2022-08-28 21:59:50.285 16084-16118/com.droid.test D/hello: Caught Exception:-> Custom Runtime Exception
2022-08-28 21:59:50.285 16084-16118/com.droid.test D/hello: Completed JOB-1
Exception handling when 2 Jobs are running under a normal parent job and exception is thrown in one of child jobs
class MainActivity : AppCompatActivity() {
val exceptionHandler = CoroutineExceptionHandler { coroutineContext, throwable ->
Log.d("hello", "Caught Exception:-> ${throwable.message}")
}
val parentScope = CoroutineScope(Job() + Dispatchers.Default + exceptionHandler)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
Log.d("hello", "Starting point")
val job1 = parentScope.launch {
Log.d("hello", "Starting JOB-1")
delay(1000)
throw RuntimeException("Custom Runtime Exception")
Log.d("hello", "Ending JOB-1")
}.invokeOnCompletion {
if(it is CancellationException){
Log.d("hello", "Canceled JOB-1: ${it.message}")
}else{
Log.d("hello", "Completed JOB-1")
}
}
val job2 = parentScope.launch {
Log.d("hello", "Starting JOB-2")
delay(2000)
Log.d("hello", "Ending JOB-2")
}.invokeOnCompletion {
if(it is CancellationException){
Log.d("hello", "Canceled JOB-2: ${it.message}")
}else{
Log.d("hello", "Completed JOB-2")
}
}
}
}
Output
2022-08-29 10:02:46.269 18356-18356/com.droid.test D/hello: Starting point
2022-08-29 10:02:46.330 18356-18407/com.droid.test D/hello: Starting JOB-1
2022-08-29 10:02:46.333 18356-18408/com.droid.test D/hello: Starting JOB-2
2022-08-29 10:02:47.350 18356-18407/com.droid.test D/hello: Canceled JOB-2: Parent job is Cancelling
2022-08-29 10:02:47.350 18356-18408/com.droid.test D/hello: Caught Exception:-> Custom Runtime Exception
2022-08-29 10:02:47.350 18356-18408/com.droid.test D/hello: Completed JOB-1
Exception handling when 2 Jobs are running under a supervisor parent job and an exception is thrown in one of child jobs
class MainActivity : AppCompatActivity() {
val exceptionHandler = CoroutineExceptionHandler { coroutineContext, throwable ->
Log.d("hello", "Caught Exception:-> ${throwable.message}")
}
val parentScope = CoroutineScope(SupervisorJob() + Dispatchers.Default + exceptionHandler)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
Log.d("hello", "Starting point")
val job1 = parentScope.launch {
Log.d("hello", "Starting JOB-1")
delay(1000)
throw RuntimeException("Custom Runtime Exception")
Log.d("hello", "Ending JOB-1")
}.invokeOnCompletion {
if(it is CancellationException){
Log.d("hello", "Canceled JOB-1: ${it.message}")
}else{
Log.d("hello", "Completed JOB-1")
}
}
val job2 = parentScope.launch {
Log.d("hello", "Starting JOB-2")
delay(2000)
Log.d("hello", "Ending JOB-2")
}.invokeOnCompletion {
if(it is CancellationException){
Log.d("hello", "Canceled JOB-2: ${it.message}")
}else{
Log.d("hello", "Completed JOB-2")
}
}
}
}
Output
2022-08-29 10:51:55.088 18709-18709/com.droid.test D/hello: Starting point
2022-08-29 10:51:55.161 18709-18759/com.droid.test D/hello: Starting JOB-1
2022-08-29 10:51:55.174 18709-18760/com.droid.test D/hello: Starting JOB-2
2022-08-29 10:51:56.185 18709-18759/com.droid.test D/hello: Caught Exception:-> Custom Runtime Exception
2022-08-29 10:51:56.185 18709-18759/com.droid.test D/hello: Completed JOB-1
2022-08-29 10:51:57.176 18709-18759/com.droid.test D/hello: Ending JOB-2
2022-08-29 10:51:57.177 18709-18759/com.droid.test D/hello: Completed JOB-2