ExpiringMap: Change expiration time of the entry at runtime

Using 'setExpiration' method, we can update the expirarion time of the entry.

 

Example

expiringMap.setExpiration(2, 30, TimeUnit.SECONDS);

Above snippet set the expiration of the entry associated with key 2 to 30 seconds.

 

Find the below working application.

 

Employee.java

package com.sample.app.model;

public class Employee {

	private int id;
	private String name;

	public Employee(int id, String name) {
		super();
		this.id = id;
		this.name = name;
	}

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	@Override
	public String toString() {
		return "Employee [id=" + id + ", name=" + name + "]";
	}

}

ExpirationTimeUpdateDemo.java

package com.sample.app;

import java.util.concurrent.TimeUnit;

import com.sample.app.model.Employee;

import net.jodah.expiringmap.ExpirationPolicy;
import net.jodah.expiringmap.ExpiringMap;

public class ExpirationTimeUpdateDemo {
	private static void sleepNSeconds(int n) throws InterruptedException {
		System.out.println("\nSleeping for " + n + " seconds");
		TimeUnit.SECONDS.sleep(n);
	}

	public static void main(String args[]) throws InterruptedException {
		ExpiringMap<Integer, Employee> expiringMap = ExpiringMap.builder().expiration(5, TimeUnit.SECONDS)
				.expirationPolicy(ExpirationPolicy.CREATED).variableExpiration().build();

		expiringMap.put(1, new Employee(1, "Krishna"));
		expiringMap.put(2, new Employee(2, "Ram"));

		sleepNSeconds(3);
		System.out.println("Entry with key 1 -> " + expiringMap.get(1));
		System.out.println("Entry with key 2 -> " + expiringMap.get(2));
		
		System.out.println("\nUpdate the expiration time of key 2 to 30 seconds\n");
		expiringMap.setExpiration(2, 30, TimeUnit.SECONDS);
		
		System.out.println("\nEntry with key 1 -> " + expiringMap.get(1));
		System.out.println("Entry with key 2 -> " + expiringMap.get(2));

		sleepNSeconds(5);
		System.out.println("\nEntry with key 1 -> " + expiringMap.get(1));
		System.out.println("Entry with key 2 -> " + expiringMap.get(2));

	}
}

Output

Sleeping for 3 seconds
Entry with key 1 -> Employee [id=1, name=Krishna]
Entry with key 2 -> Employee [id=2, name=Ram]

Update the expiration time of key 2 to 30 seconds


Entry with key 1 -> Employee [id=1, name=Krishna]
Entry with key 2 -> Employee [id=2, name=Ram]

Sleeping for 5 seconds

Entry with key 1 -> null
Entry with key 2 -> Employee [id=2, name=Ram]

 

  

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