1 Dec
2022
1 Dec
'22
7 a.m.
Issue #19154 has been updated by alanpowel47 (Alan Powel).
The add(E e) method of Queue Interface inserts the element passed in the parameter to the
end of the queue if there is space. If the Queue is capacity restricted and no space is
left for insertion, it returns an IllegalStateException. The function returns true on
successful insertion. Syntax:
boolean add(E e)
Parameters: This method accepts a mandatory parameter e which is the element to be
inserted in the end of the Queue. Returns: This method returns true on successful
insertion. Exceptions: The function throws four exceptions which are described as below:
ClassCastException: when the class of the element to be entered prevents it from being
added to this container.
IllegalStateException: when the capacity of the container is full and insertion is done.
IllegalArgumentException: when some property of the element prevents it to be added to the
queue.
NullPointerException: when the element to be inserted is passed as null and the Queue’s
interface does not allow null elements.
Below programs illustrate add() method of Queue: Program 1: With the help of LinkedList.
// Java Program Demonstrate add()
// method of Queue
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
// create object of Queue
Queue<Integer> Q
= new LinkedList<Integer>();
// Add numbers to end of Queue
Q.add(7855642);
Q.add(35658786);
Q.add(5278367);
Q.add(74381793);
// before removing print queue
System.out.println("Queue: " + Q);
}
}
Output:
Program 2: With the help of ArrayDeque.
// Java Program Demonstrate add()
// method of Queue
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
// create object of Queue
Queue<Integer> Q
= new ArrayDeque<Integer>();
// Add numbers to end of Queue
Q.add(7855642);
Q.add(35658786);
Q.add(5278367);
Q.add(74381793);
// before removing print queue
System.out.println("Queue: " + Q);
}
}
Output:
Queue: [7855642, 35658786, 5278367, 74381793]
Program 3: With the help of LinkedBlockingDeque.
// Java Program Demonstrate add()
// method of Queue
import java.util.*;
import java.util.concurrent.LinkedBlockingDeque;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
// create object of Queue
Queue<Integer> Q
= new LinkedBlockingDeque<Integer>();
// Add numbers to end of Queue
Q.add(7855642);
Q.add(35658786);
Q.add(5278367);
Q.add(74381793);
// before removing print queue
System.out.println("Queue: " + Q);
}
}
Output:
Queue: [7855642, 35658786, 5278367, 74381793]
Program 4: With the help of ConcurrentLinkedDeque.
// Java Program Demonstrate add()
// method of Queue
import java.util.*;
import java.util.concurrent.ConcurrentLinkedDeque;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
// create object of Queue
Queue<Integer> Q
= new ConcurrentLinkedDeque<Integer>();
// Add numbers to end of Queue
Q.add(7855642);
Q.add(35658786);
Q.add(5278367);
Q.add(74381793);
// before removing print queue
System.out.println("Queue: " + Q);
}
}
Output:
Queue: [7855642, 35658786, 5278367, 74381793]
Below programs illustrate exceptions thrown by this method: Program 5: To show
NullPointerException.
// Java Program Demonstrate add()
// method of Queue when Null is passed
import java.util.*;
import java.util.concurrent.LinkedBlockingQueue;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
// create object of Queue
Queue<Integer> Q
= new LinkedBlockingQueue<Integer>();
// Add numbers to end of Queue
Q.add(7855642);
Q.add(35658786);
Q.add(5278367);
try {
// when null is inserted
Q.add(null);
}
catch (Exception e) {
System.out.println("Exception: " + e);
}
}
}
Output:
Exception: java.lang.NullPointerException
Program 6: To show IllegalStateException.
// Java Program Demonstrate add()
// method of Queue when capacity is full
import java.util.*;
import java.util.concurrent.LinkedBlockingQueue;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
// create object of Queue
Queue<Integer> Q
= new LinkedBlockingQueue<Integer>(3);
// Add numbers to end of Queue
Q.add(7855642);
Q.add(35658786);
Q.add(5278367);
try {
// when capacity is full
Q.add(10);
}
catch (Exception e) {
System.out.println("Exception: " + e);
}
}
}
Output:
Exception: java.lang.IllegalStateException: Queue full
For the UiPath.Core.Activities.AddQueueItem activity to work in a process, the Robot must
be connected to Orchestrator. This is needed in order to send and retrieve information
about queues, items and statuses.
Schema definition values added to queues in Orchestrator and marked as required are
automatically imported in the Dictionary Builder of the activity.
Values marked as not required can be added to queue items and not be enforced.
Project compatibility
Windows - Legacy | Windows | Cross-platform
Windows, Cross-platform configuration
Orchestrator folder path - The path of the folder where the specified queue is located, if
different from the folder where the process is running. This field only supports string
values, with / as the separator to indicate subfolders. For example "Finance/Accounts
Payable".
📘
Note:
The Orchestrator folder path parameter does not work for processes executed by robots in
classic folders. Only robots in modern folders have the ability to pass data outside of
their folder.
Relative folder paths are supported in an X-UIPATH-FolderPath-Encoded header, as
follows:
Path starting with / - starts from the root folder of the tree the ambient folder is part
of.
Path starting with . - starts from the ambient folder.
Path starting with .. - starts one level up in the hierarchy of the ambient folder for
each .. in the path (e.g. ../ for one level up, ../../ for two levels up in the
hierarchy).
Note that trailing slashes are not accepted.
Queue Name - The queue where the QueueItem object is to be added. The name is case
insensitive, meaning that if in Orchestrator it was defined as "MyFirstQueue",
it matches "myfirstqueue". The maximum number of characters is 50.
Item Information - A collection of additional information about the specific QueueItem
that is to be added. The information is stored in the item and is used during a
transaction processing. It is recommended to use only primitive values of the following
types: Number, Boolean, String and DateTime. The value of string arguments cannot contain
the following characters: [ and " ". Argument names cannot contain the following
characters: :, ., ,, @, ".
Advanced options. Basically I have to add the UIPATH while working on the react native
development agency(https://enterprise.affle.com/react-native-app-development) , then I
have to learned the same.
Input
Deadline - The date before which the queue item should be processed. This property is a
criterion for the prioritization of queue items, alongside Priority and Postpone. This
property can be filled in with relative dates such as DateTime.Now.AddHours(2),
DateTime.Now.AddDays(10) and DateTime.Now.Add(New System.TimeSpan(5, 0, 0, 0)).
Additionally, you can use the US notation to add an exact time, such as 12/10/2017
07:40:00. Automatically correcting this date is available. For example, if you write 8 9
2018 9:0, it is automatically transformed to 08/09/2018 09:00:00.
Item Collection - Enables importing an entire dictionary of information for a queue item.
This field only accepts Dictionary<string, object> variables.
Postpone - The date after which the queue item may be processed. This property is a
criterion for the prioritization of queue items, alongside Priority and Deadline. This
property can be filled in with relative dates such as DateTime.Now.AddHours(2),
DateTime.Now.AddDays(10) and DateTime.Now.Add(New System.TimeSpan(5, 0, 0, 0)).
Additionally, you can use the US notation to add an exact time, such as 12/10/2017
07:40:00. Automatically correcting this date is available. For example, if you write 8 9
2018 9:0, it is automatically transformed to 08/09/2018 09:00:00.
Priority - The priority level of the queue item to be added. This property is a criterion
for the prioritization of queue items, alongside Deadline and Postpone.
Reference - The reference of the added QueueItem. The reference can be used to link your
transactions to other applications used within an automation project. Additionally, this
feature enables you to search for certain transactions, in Orchestrator, according to the
provided string.
📘
Note:
DueDate is a reserved keyword. It cannot be used inside any property when configuring this
activity.
Misc
Timeout (milliseconds) - Specifies the amount of time (in milliseconds) to wait for the
activity to run before an error is thrown. The default value is 30000 milliseconds (30
seconds).
Continue on error - Specifies if the automation should continue even when the activity
throws an error. This field only supports Boolean values (True, False). The default value
is False. As a result, if the field is blank and an error is thrown, the execution of the
project stops. If the value is set to True, the execution of the project continues
regardless of any error.
📘
Note:
If this activity is included in Try Catch and the value of the Continue On Error property
is True, no error is caught when the project is executed.
Windows - Legacy configuration
Properties panel
Common
Continue On Error - Specifies if the automation should continue even when the activity
throws an error. This field only supports Boolean values (True, False). The default value
is False. As a result, if the field is blank and an error is thrown, the execution of the
project stops. If the value is set to True, the execution of the project continues
regardless of any error.
📘
Note:
If this activity is included in Try Catch and the value of the Continue On Error property
is True, no error is caught when the project is executed.
DisplayName - The display name of the activity.
Timeout (milliseconds) - Specifies the amount of time (in milliseconds) to wait for the
activity to run before an error is thrown. The default value is 30000 milliseconds (30
seconds).
Input
Deadline - The date before which the queue item should be processed. This property is a
criterion for the prioritization of queue items, alongside Priority and Postpone. This
property can be filled in with relative dates such as DateTime.Now.AddHours(2),
DateTime.Now.AddDays(10) and DateTime.Now.Add(New System.TimeSpan(5, 0, 0, 0)).
Additionally, you can use the US notation to add an exact time, such as 12/10/2017
07:40:00. Automatically correcting this date is available. For example, if you write 8 9
2018 9:0, it is automatically transformed to 08/09/2018 09:00:00.
Item Collection - Enables importing an entire dictionary of information for a queue item.
This field only accepts Dictionary<string, object> variables.
Item Information - A collection of additional information about the specific QueueItem
that is to be added. The information is stored in the item and is used during a
transaction processing. It is recommended to use only primitive values of the following
types: Number, Boolean, String and DateTime. The value of string arguments cannot contain
the following characters: [ and " ". Argument names cannot contain the following
characters: :, ., ,, @, ".
Postpone - The date after which the queue item may be processed. This property is a
criterion for the prioritization of queue items, alongside Priority and Deadline. This
property can be filled in with relative dates such as DateTime.Now.AddHours(2),
DateTime.Now.AddDays(10) and DateTime.Now.Add(New System.TimeSpan(5, 0, 0, 0)).
Additionally, you can use the US notation to add an exact time, such as 12/10/2017
07:40:00. Automatically correcting this date is available. For example, if you write 8 9
2018 9:0, it is automatically transformed to 08/09/2018 09:00:00.
Priority - The priority level of the queue item to be added. This property is a criterion
for the prioritization of queue items, alongside Deadline and Postpone.
Queue Name - The queue where the QueueItem object is to be added. The name is case
insensitive, meaning that if in Orchestrator it was defined as "MyFirstQueue",
it matches "myfirstqueue". The maximum number of characters is 50.
Reference - The reference of the added QueueItem. The reference can be used to link your
transactions to other applications used within an automation project. Additionally, this
feature enables you to search for certain transactions, in Orchestrator, according to the
provided string.
📘
Note
DueDate is a reserved keyword. It cannot be used inside any property when configuring this
activity.
Misc
Folder Path - The path of the folder where the specified queue is located, if different
from the folder where the process is running. This field only supports string values, with
/ as the separator to indicate subfolders. For example "Finance/Accounts
Payable".
📘
Note:
The Folder Path parameter does not work for processes executed by robots in classic
folders. Only robots in modern folders have the ability to pass data outside of their
folder.
Relative folder paths are supported in an X-UIPATH-FolderPath-Encoded header, as
follows:
Path starting with / - starts from the root folder of the tree the ambient folder is part
of.
Path starting with . - starts from the ambient folder.
Path starting with .. - starts one level up in the hierarchy of the ambient folder for
each .. in the path (e.g. ../ for one level up, ../../ for two levels up in the
hierarchy).
Note that trailing slashes are not accepted.
Private - If selected, the values of variables and arguments are no longer logged at
Verbose level.
Hope this will help everyone.
----------------------------------------
Bug #19154: Specify require and autoload guarantees in ractors
https://bugs.ruby-lang.org/issues/19154#change-100406
* Author: fxn (Xavier Noria)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.2.0preview3 (2022-11-27) [x86_64-darwin22]
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
Given a file `c.rb`:
```ruby
class C
end
```
the following script:
```ruby
r1 = Ractor.new do
require './c.rb'
end
r2 = Ractor.new do
require './c.rb'
end
r1.take
r2.take
```
raises:
```
% ruby -v foo.rb
ruby 3.2.0preview3 (2022-11-27) [x86_64-darwin22]
foo.rb:1: warning: Ractor is experimental, and the behavior may change in future versions
of Ruby! Also there are many implementation issues.
#<Thread:0x000000010fee2928 run> terminated with exception (report_on_exception is
true):
#<Thread:0x00000001102acfe0 run> terminated with exception (report_on_exception is
true):
<internal:/Users/fxn/.rbenv/versions/3.2.0-preview3/lib/ruby/3.2.0+3/rubygems/core_ext/kernel_require.rb>:164:in
`ensure in require': can not access non-shareable objects in constant
Kernel::RUBYGEMS_ACTIVATION_MONITOR by non-main ractor. (Ractor::IsolationError)
from
<internal:/Users/fxn/.rbenv/versions/3.2.0-preview3/lib/ruby/3.2.0+3/rubygems/core_ext/kernel_require.rb>:167:in
`require'
from foo.rb:6:in `block in <main>'
<internal:/Users/fxn/.rbenv/versions/3.2.0-preview3/lib/ruby/3.2.0+3/rubygems/core_ext/kernel_require.rb>:37:in
`require'<internal:/Users/fxn/.rbenv/versions/3.2.0-preview3/lib/ruby/3.2.0+3/rubygems/core_ext/kernel_require.rb>:164:in
`ensure in require': : can not access non-shareable objects in constant
Kernel::RUBYGEMS_ACTIVATION_MONITOR by non-main ractor. (Ractor::IsolationError)
from
<internal:/Users/fxn/.rbenv/versions/3.2.0-preview3/lib/ruby/3.2.0+3/rubygems/core_ext/kernel_require.rb>:167:in
`require'
can not access non-shareable objects in constant Kernel::RUBYGEMS_ACTIVATION_MONITOR by
non-main ractor. (Ractor::IsolationError) from foo.rb:2:in `block in
<main>'
<internal:/Users/fxn/.rbenv/versions/3.2.0-preview3/lib/ruby/3.2.0+3/rubygems/core_ext/kernel_require.rb>:37:in
`require': can not access non-shareable objects in constant
Kernel::RUBYGEMS_ACTIVATION_MONITOR by non-main ractor. (Ractor::IsolationError)
from foo.rb:2:in `block in <main>'
from foo.rb:6:in `block in <main>'
<internal:ractor>:698:in `take': thrown by remote Ractor.
(Ractor::RemoteError)
from foo.rb:9:in `<main>'
<internal:/Users/fxn/.rbenv/versions/3.2.0-preview3/lib/ruby/3.2.0+3/rubygems/core_ext/kernel_require.rb>:164:in
`ensure in require': can not access non-shareable objects in constant
Kernel::RUBYGEMS_ACTIVATION_MONITOR by non-main ractor. (Ractor::IsolationError)
from
<internal:/Users/fxn/.rbenv/versions/3.2.0-preview3/lib/ruby/3.2.0+3/rubygems/core_ext/kernel_require.rb>:167:in
`require'
from foo.rb:2:in `block in <main>'
<internal:/Users/fxn/.rbenv/versions/3.2.0-preview3/lib/ruby/3.2.0+3/rubygems/core_ext/kernel_require.rb>:37:in
`require': can not access non-shareable objects in constant
Kernel::RUBYGEMS_ACTIVATION_MONITOR by non-main ractor. (Ractor::IsolationError)
from foo.rb:2:in `block in <main>'
```
Would it be possible to have documentation about their interaction?
This is important also to understand autoloading within ractors, since constant references
may trigger `require` calls.
--
https://bugs.ruby-lang.org/