ExpiringMap: Get expected expiration time of a key

Using 'getExpectedExpiration' method, we can get the expected expiration time. This method return the expected expiration time in milliseconds.

 

Example

long expectedExpiration1 = expiringMap.getExpectedExpiration(1);

 

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 + "]";
	}
	
	public void logOnExpire() {
		System.out.println(this.toString() + " is expired");
	}

}

 

ExpectedExpirationDemo.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 ExpectedExpirationDemo {

	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).build();

		expiringMap.put(1, new Employee(1, "Employee" + 1));
		sleepNSeconds(2);

		expiringMap.put(2, new Employee(2, "Employee" + 2));

		long expectedExpiration1 = expiringMap.getExpectedExpiration(1);
		long expectedExpiration2 = expiringMap.getExpectedExpiration(2);

		System.out.println("Expected exiry time for entry1 " + expectedExpiration1 +  " milli seconds");
		System.out.println("Expected exiry time for entry2 " + expectedExpiration2 + " milli seconds");

	}
}

 

Output

Sleeping for 2 seconds
Expected exiry time for entry1 2981 milli seconds
Expected exiry time for entry2 4999 milli seconds

 

 

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