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  • ArrayBlockingQueue Vs. Contoh EvictingQueue Google Guava Non-Blocking

ArrayBlockingQueue Vs. Contoh EvictingQueue Google Guava Non-Blocking

Diterbitkan: 2020-12-29
ArrayBlockingQueue Vs. Contoh EvictingQueue Google Guava Non-Blocking

Utilitas konkurensi sangat menakjubkan di Jawa.

Paket java.util.concurrent berisi banyak utilitas yang dapat kita gunakan dalam berbagai cara.

Dalam tutorial ini kita akan membahas perbedaan antara java.util.concurrent. ArrayBlockingQueue dan com.google.common.collect. EvictingQueue .

Apa itu EvictingQueue?

EvictingQueue adalah bagian dari Google's Guava library . Yang merupakan antrian non-blocking , bounded (Ukuran Tetap) yang secara otomatis removes elemen dari head antrian ketika mencoba menambahkan elemen ke full queue .

Bagaimana cara menambahkan perpustakaan Guava Google ke Proyek Eclipse-java Anda?

Anda dapat menambahkan ketergantungan maven di bawah ini ke file pom.xml jika Anda menggunakan proyek maven. Dalam kasus proyek non-maven - Anda harus mengunduhnya dari sini dan memasukkan perpustakaan ke dalam classpath proyek Anda.

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< dependency >
     < groupId > com . google . guava < / groupId >
     < artifactId > guava < / artifactId >
     < version > 30.1.1 - jre < / version >
< / dependency >

Apa itu ArrayBlockingQueue?

Ini adalah antrian blocking , bounded (Ukuran Tetap) yang menyimpan elemen secara internal dalam sebuah array. Itu CAN'T menyimpan jumlah elemen yang unlimited . Antrian ini mengurutkan elemen FIFO (first-in-first-out).

Read more : Contoh Antrian Singleton

Mari kita mulai Contoh

  1. Buat ArrayBlockingQueue dengan ukuran 10
  2. Buat EvictingQueue dengan ukuran 10
  3. Coba tambahkan 15 elemen ke antrian
  4. Untuk EvictingQueue – itu tidak akan menimbulkan kesalahan apa pun
  5. Untuk ArrayBlockingQueue – itu akan menimbulkan kesalahan Queue Full

Buat kelas CrunchifyArrayBlockingQueueVsEvictingQueue.java

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package crunchify . com . tutorials ;
 
import com . google . common . collect . EvictingQueue ;
 
import java . util . Queue ;
import java . util . concurrent . ArrayBlockingQueue ;
 
/**
* @author Crunchify.com
* ArrayBlockingQueue Vs. Google Guava Non-Blocking EvictingQueue Example
*
*/
 
public class CrunchifyArrayBlockingQueueVsEvictingQueue {
 
private static void CrunchifyArrayBlockingQueue ( ) {
// ArrayBlockingQueue: A bounded blocking queue backed by an array. This queue orders elements FIFO (first-in-first-out).
// The head of the queue is that element that has been on the queue the longest time.
// The tail of the queue is that element that has been on the queue the shortest time.
// New elements are inserted at the tail of the queue, and the queue retrieval operations obtain elements at the head of the queue.
ArrayBlockingQueue < String > crunchifyQueue = new ArrayBlockingQueue < String > (
10 ) ;
 
String crunchifyMsg = "This is ArrayBlockingQueue - by Crunchify" ;
try {
// We are looping for 15 times - Error once queue full
for ( int counter = 1 ; counter < = 15 ; counter ++ ) {
// add(): Inserts the specified element at the tail of this queue if it is possible to do so immediately without exceeding the queue's capacity,
// returning true upon success and throwing an IllegalStateException if this queue is full.
crunchifyQueue . add ( crunchifyMsg + counter ) ;
// size(): Returns the number of elements in this queue.
crunchifyLog ( "ArrayBlockingQueue size: " + crunchifyQueue . size ( ) ) ;
}
} catch ( Exception e ) {
crunchifyLog ( "\nException Occurred: " ) ;
e . printStackTrace ( ) ;
}
 
}
 
public static void main ( String [ ] args ) {
 
// Test EvictingQueue with size 10
CrunchifyEvictingQueue ( ) ;
 
crunchifyLog ( "\n============= New LINE ==============\n" ) ;
 
// Test ArrayBlockingQueue with size 10
CrunchifyArrayBlockingQueue ( ) ;
}
 
private static void CrunchifyEvictingQueue ( ) {
// Queue: A collection designed for holding elements prior to processing. Besides basic Collection operations,
// queues provide additional insertion, extraction, and inspection operations.
// Each of these methods exists in two forms: one throws an exception if the operation fails,
// the other returns a special value (either null or false, depending on the operation).
Queue < String > crunchifyQueue = EvictingQueue . create ( 10 ) ;
 
String crunchifyMsg = "This is EvictingQueue - by Crunchify" ;
try {
// We are looping for 15 times - No error after queue full.
// Instead, it will remove element from queue in FIFO order
for ( int i = 1 ; i < = 15 ; i ++ ) {
// add: Inserts the specified element into this queue if it is possible to do so immediately without violating capacity restrictions,
// returning true upon success and throwing an IllegalStateException if no space is currently available.
crunchifyQueue . add ( crunchifyMsg + i ) ;
 
crunchifyLog ( "EvictingQueue size: " + crunchifyQueue . size ( ) ) ;
}
} catch ( Exception e ) {
crunchifyLog ( "Exception Occurred: " + e ) ;
}
 
}
 
private static void crunchifyLog ( String crunchifyText ) {
System . out . println ( crunchifyText ) ;
 
}
 
}
 

Jalankan saja Program Java ini sebagai aplikasi di Eclipse Console atau IntelliJ IDEA dan Anda akan melihat hasilnya seperti ini.

Hasil Konsol:

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EvictingQueue size : 1
EvictingQueue size : 2
EvictingQueue size : 3
EvictingQueue size : 4
EvictingQueue size : 5
EvictingQueue size : 6
EvictingQueue size : 7
EvictingQueue size : 8
EvictingQueue size : 9
EvictingQueue size : 10
EvictingQueue size : 10
EvictingQueue size : 10
EvictingQueue size : 10
EvictingQueue size : 10
EvictingQueue size : 10
 
============= New LINE ==============
 
ArrayBlockingQueue size : 1
ArrayBlockingQueue size : 2
ArrayBlockingQueue size : 3
ArrayBlockingQueue size : 4
ArrayBlockingQueue size : 5
ArrayBlockingQueue size : 6
ArrayBlockingQueue size : 7
ArrayBlockingQueue size : 8
ArrayBlockingQueue size : 9
ArrayBlockingQueue size : 10
 
Exception Occurred :
java . lang . IllegalStateException : Queue full
at java . base / java . util . AbstractQueue . add ( AbstractQueue . java : 98 )
at java . base / java . util . concurrent . ArrayBlockingQueue . add ( ArrayBlockingQueue . java : 329 )
at crunchify . com . tutorials . CrunchifyArrayBlockingQueueVsEvictingQueue . CrunchifyArrayBlockingQueue ( CrunchifyArrayBlockingQueueVsEvictingQueue . java : 32 )
at crunchify . com . tutorials . CrunchifyArrayBlockingQueueVsEvictingQueue . main ( CrunchifyArrayBlockingQueueVsEvictingQueue . java : 52 )
 
Process finished with exit code 0

Beri tahu saya jika Anda menghadapi masalah saat menjalankan program di atas.