CopyOnWrite | μframework encapsulating the CopyOnWrite type , to make | User Interface library
kandi X-RAY | CopyOnWrite Summary
kandi X-RAY | CopyOnWrite Summary
μframework encapsulating the CopyOnWrite type, to make implementing value semantics easy!.
Support
Quality
Security
License
Reuse
Top functions reviewed by kandi - BETA
Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of CopyOnWrite
CopyOnWrite Key Features
CopyOnWrite Examples and Code Snippets
Lines of Code : 30License : Permissive (MIT)
Copyclass Foo {
var num: Int = 0
}
struct Bar {
private var storage = CopyOnWrite(reference: Foo(), copier: {
let new = Foo()
new.num = $0.num
return new
})
var num: Int {
return storage.reference.num
}
mutating func update var s1 = "Foo"
var s2 = s1
s1.append("Bar")
print(s1) // FooBar
print(s2) // Foo
class Foo {
var num: Int = 0
}
struct Bar {
private var storage = Foo()
var num: Int {
return storage.num
}
func update(_ num: Int) {
storage.num = public protocol Cloneable: class {
func clone() -> Self
}
extension Foo: Cloneable {
func clone() -> Self {
let new = self.init()
new.num = num
return new
}
}
struct Bar {
private var storage = CopyOnWrite(reference: Foo() Community Discussions
Trending Discussions on CopyOnWrite
QUESTION
Fail-fast iterator iterates over collection. If collection gets modified while iterating, we get exception. Opposite applies for fail-safe, where iteration is happening on one collection, while write operation happen on copy of it, thus it is how fail-safe works (f.e. CopyOnWriteArrayList).
Can someone explain me how does ConcurrentSkipListSet has fail-safe? There are no copies when modifying collection (like CopyOnWrite classes do), so how does it happen? I read because its Iterator is weakly consistent. I read docs, I still don't understand. (but I do know what code visibility or happens-before relation in concurrency is).
Does anyone have logic and easy to remember explanation, as I am a beginner?
//Example:
...ANSWER
Answered 2020-Aug-22 at 11:49The "weakly consistent" term is defined in the java.util.concurrent package description:
Most concurrent Collection implementations (including most Queues) also differ from the usual java.util conventions in that their Iterators and Spliterators provide weakly consistent rather than fast-fail traversal:
- they may proceed concurrently with other operations
- they will never throw
ConcurrentModificationException- they are guaranteed to traverse elements as they existed upon construction exactly once, and may (but are not guaranteed to) reflect any modifications subsequent to construction.
In this case with ConcurrentSkipListSet, the iterator does not have a "fast-fail" property, instead it reflects the modification of 4 having been removed from the set.
Internally, ConcurrentSkipListSet is implemented with ConcurrentSkipListMap, and its iterators are implemented by keeping track of which skip list node should be traversed next. This naturally gives you the "weakly consistent" property: If the next item is deleted, the iterator will still return it. If items beyond the next are deleted, the iterator will reflect those changes.
QUESTION
I am trying to understand CopyOnWriteArrayList. Normally as for my understanding we cannot remove elements in for loop while we can remove in iterator if it exists..
...ANSWER
Answered 2019-Dec-16 at 17:37No, the iterator is not supposed to make mutations, from the javadoc
https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/CopyOnWriteArrayList.html
"Element-changing operations on iterators themselves (remove, set, and add) are not supported. These methods throw UnsupportedOperationException."
In the first case it must be making a copy of the list upon mutation, which is the expected behavior for CopyOnWriteArrayList.
QUESTION
I'm upgrading our existing spring boot 1.5 app to Spring boot 2.0. The application utilizes Spring Integration xmls as well. The Ehcache component is causing issues while trying to to this. While trying to add the response of a GET call to cache, its throwing an exception:
Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.messaging.MessageHandlingException: error occurred in message handler [httpGatewayLookupSize]; nested exception is net.sf.ehcache.CacheException: When configured copyOnRead or copyOnWrite, a Store will only accept Serializable values, failedMessage=GenericMessage [payload={}, headers={http_requestMethod=GET .....]] with root cause
java.io.NotSerializableException: org.springframework.integration.support.MessageBuilder
With Spring Boot 1.5 it works perfectly fine and the value(XML Response) inserted in the Cache is of type GenericMessage. Below is the entire stack trace:
...ANSWER
Answered 2019-Mar-10 at 02:15For some internal optimization many out-of-the-box Spring Integration components now return a MessageBuilder before producing replies. This is needed to enrich a target reply message with extra headers.
Looks like the CacheInterceptor performs invocation.proceed() ad tries to use the result as is for caching.
Consider to add one more MethodInterceptor before your configured CacheInterceptor with a simple implementation like this:
QUESTION
I am trying to integrate ehcache into spring mvc and hibernate application but its not working below is the code. I have followed the link - how to use ehcache in spring mvc with hibernate but still i am facing the problem. This problem is coming when i am starting the sertver. I am using spring 5.0.5
springmvc.xml
...ANSWER
Answered 2018-Jul-02 at 19:25I had the same issue. By adding @EnableCaching to the spring boot application @SpringBootApplication problem got resolved. Please try.
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install CopyOnWrite
Support
Reuse Trending Solutions
Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items
Find more librariesStay Updated
Subscribe to our newsletter for trending solutions and developer bootcamps
Share this Page
