ReturningRetryableService.java

package br.com.faculdadeidez.loja.utils;

public abstract class ReturningRetryableService<T> {

	private int maxRetries = 3;
	private int retryCount = 0;
	private T result;
	
	public ReturningRetryableService() {
	}
	
	public abstract T execute();
	
	public void run() {
		Exception error = null;
		
		while ( this.retryCount < this.maxRetries ) {
			try {
				this.result = this.execute();
				error = null;
				break;
			} catch ( Exception e ) {
				e.printStackTrace();
				error = e;
				this.retryCount++;
				try {
					Thread.sleep( 2500 );
				} catch ( InterruptedException ie ) {
					ie.printStackTrace();
				}
			}
		}			
		
		if ( error != null ) {
			throw new IllegalStateException(error);
		}
	}
	
}