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package javax.servlet;

import java.io.IOException;
import java.util.EventListener;

/**
 * 

* This class represents a call-back mechanism that will notify implementations * as HTTP request data becomes available to be read without blocking. *

* * @since Servlet 3.1 */ public interface ReadListener extends EventListener { /** * When an instance of the ReadListener is registered with a {@link ServletInputStream}, * this method will be invoked by the container the first time when it is possible * to read data. Subsequently the container will invoke this method if and only * if the {@link javax.servlet.ServletInputStream#isReady()} method * has been called and has returned a value of false and * data has subsequently become available to read. * * @throws IOException if an I/O related error has occurred during processing */ public void onDataAvailable() throws IOException; /** * Invoked when all data for the current request has been read. * * @throws IOException if an I/O related error has occurred during processing */ public void onAllDataRead() throws IOException; /** * Invoked when an error occurs processing the request. * * @param t the throwable to indicate why the read operation failed */ public void onError(Throwable t); }




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