complete TODO's using Java

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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complete TODO's using Java

}
try {
Thread.sleep (SERVICE_TIME);
} catch (final InterruptedException ex) {
return;
}
}
});
consumer.setDaemon(true);
consumer.start();
// foreground activity for reading customer names from input
final var input = new Scanner(System.in);
System.out.print("enter next customer: ");
while (input.hasNextLine ( )) {
final var name :String
input.nextLine();
var result
false;
synchronized (lock) {
// TODO try to add this name to the queue
}
if (result) {
System.out.println(name + " has joined the queue");
} else {
System.out.println("queue full,
unable to join");
+ name +
}
}
}
Transcribed Image Text:} try { Thread.sleep (SERVICE_TIME); } catch (final InterruptedException ex) { return; } } }); consumer.setDaemon(true); consumer.start(); // foreground activity for reading customer names from input final var input = new Scanner(System.in); System.out.print("enter next customer: "); while (input.hasNextLine ( )) { final var name :String input.nextLine(); var result false; synchronized (lock) { // TODO try to add this name to the queue } if (result) { System.out.println(name + " has joined the queue"); } else { System.out.println("queue full, unable to join"); + name + } } }
public class SingleQueueService {
/** Service time per Customer in ms. */
static final int SERVICE_TIME = 2000;
/** Reads sUccessive input lines until E0F and tries to add them to the queue for processing. */
public static void main(final String[] args) throws InterruptedException {
// queue for customer names
final SimpleQueue<String> queue = new FixedArrayQueue<>( capacity: 5);
// lock object for thread safety
final var lock = new 0bject();
// background activity for serving customers
final Thread consumer =
new Thread (
() -> {
while (true) {
String current;
int remaining;
synchronized (lock) {
current = null; // TODO try to take next name from queue
remaining = 0; // TODO determine resulting size of queue
}
if (current == null) {
System.out.println("no one waiting");
} else {
System.out.println(current + " is being served,
+ remaining +
still waiting");
}
try {
Thread.sleep (SERVICE_TIME);
Transcribed Image Text:public class SingleQueueService { /** Service time per Customer in ms. */ static final int SERVICE_TIME = 2000; /** Reads sUccessive input lines until E0F and tries to add them to the queue for processing. */ public static void main(final String[] args) throws InterruptedException { // queue for customer names final SimpleQueue<String> queue = new FixedArrayQueue<>( capacity: 5); // lock object for thread safety final var lock = new 0bject(); // background activity for serving customers final Thread consumer = new Thread ( () -> { while (true) { String current; int remaining; synchronized (lock) { current = null; // TODO try to take next name from queue remaining = 0; // TODO determine resulting size of queue } if (current == null) { System.out.println("no one waiting"); } else { System.out.println(current + " is being served, + remaining + still waiting"); } try { Thread.sleep (SERVICE_TIME);
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