LocalInvocationRunner.java

package br.ufms.dct.simplerep.proxies.http;

import java.io.IOException;
import java.util.concurrent.SynchronousQueue;

import org.apache.http.HttpClientConnection;
import org.apache.http.HttpException;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.protocol.HttpContext;
import org.apache.http.protocol.HttpRequestExecutor;
import org.apache.http.util.EntityUtils;
import org.apache.log4j.Logger;

public class LocalInvocationRunner implements Runnable  {
	
	private final HttpRequestExecutor httpexecutor;
	private HttpRequest request;
	private HttpContext context;
	private HttpClientConnection conn;
	
	static Logger logger = Logger.getLogger(LocalInvocationRunner.class.getName());
	
	// the queue from which the proxy is waiting the local response
	SynchronousQueue<String> outQueue;
	
	public LocalInvocationRunner(SynchronousQueue<String> out 
								 , HttpRequestExecutor exec
								 , HttpRequest request
								 , HttpContext ctxt
								 , HttpClientConnection conn
								 ) {
		this.outQueue = out;
		this.httpexecutor = exec;
		this.context = ctxt;
		this.request = request;
		this.conn = conn;
	}
	
	public void run() {
		try {
			HttpResponse targetResponse = this.httpexecutor.execute(request, conn, context);
			String response = EntityUtils.toString(targetResponse.getEntity());
			
			logger.info("Local response received. Notifying the proxy.");
			outQueue.put(response);
		} 
		catch (IOException e) {
			if (conn != null && !conn.isOpen()) {
				logger.debug("IOException. The connection to the AppServer is closed. It's very likely that the response has already been generated by another replica.");
			}
			else {
				logger.error("IOException when contacting the local AppServer.");	
			}
		}
		catch (IllegalStateException e) {
			logger.debug("The connection to the AppServer is closed. It's very likely that the response has already been generated by another replica.");
		}
		catch (HttpException e) {
			logger.error("HttpException Error when contacting the local AppServer.");
		} 
		catch (InterruptedException e) {
			logger.error("InterruptedException when trying to notify the HTTP Proxy's response queue.");
		}
	}

}