public static void main(String[] args) throws Exception {
HttpParams params = new BasicHttpParams();
params
.setIntParameter(CoreConnectionPNames.SO_TIMEOUT, 5000)
.setIntParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 10000)
.setIntParameter(CoreConnectionPNames.SOCKET_BUFFER_SIZE, 8 * 1024)
.setBooleanParameter(CoreConnectionPNames.STALE_CONNECTION_CHECK, false)
.setBooleanParameter(CoreConnectionPNames.TCP_NODELAY, true)
.setParameter(CoreProtocolPNames.USER_AGENT, "HttpComponents/1.1");
BasicHttpProcessor httpproc = new BasicHttpProcessor();
httpproc.addInterceptor(new RequestContent());
httpproc.addInterceptor(new RequestTargetHost());
httpproc.addInterceptor(new RequestConnControl());
httpproc.addInterceptor(new RequestUserAgent());
httpproc.addInterceptor(new RequestExpectContinue());
// Set up protocol handler
BufferingHttpClientHandler protocolHandler =
new BufferingHttpClientHandler(
httpproc,
new MyHttpRequestExecutionHandler(),
new DefaultConnectionReuseStrategy(),
params);
protocolHandler.setEventListener(new EventLogger());
// Limit the total maximum of concurrent connections to 5
int maxTotalConnections = 5;
// Use the connection manager to maintain a pool of connections to localhost:8080
final AsyncConnectionManager connMgr =
new AsyncConnectionManager(
new HttpHost("localhost", 8080), maxTotalConnections, protocolHandler, params);
// Start the I/O reactor in a separate thread
Thread t =
new Thread(
new Runnable() {
public void run() {
try {
connMgr.execute(); // The connection manager wraps the I/O reactor.
} catch (InterruptedIOException ex) {
System.err.println("Interrupted");
} catch (IOException e) {
System.err.println("I/O error: " + e.getMessage());
}
System.out.println("I/O reactor terminated");
}
});
t.start();
// Submit 50 requests using maximum 5 concurrent connections
Queue<RequestHandle> queue = new LinkedList<RequestHandle>();
for (int i = 0; i < 50; i++) {
AsyncConnectionRequest connRequest =
connMgr.requestConnection(); // Get a working connection from the connection manager.
connRequest
.waitFor(); // Wait for the connection request to be completed to the target authority.
NHttpClientConnection conn =
connRequest.getConnection(); // Get the real connection from the connection request.
if (conn == null) {
System.err.println("Failed to obtain connection");
break;
}
HttpContext context = conn.getContext();
BasicHttpRequest httpget = new BasicHttpRequest("GET", "/", HttpVersion.HTTP_1_1);
RequestHandle handle = new RequestHandle(connMgr, conn);
context.setAttribute("request", httpget);
context.setAttribute("request-handle", handle);
queue.add(handle);
conn.requestOutput();
}
// Wait until all requests have been completed
while (!queue.isEmpty()) {
RequestHandle handle = queue.remove();
handle.waitFor();
}
// Give the I/O reactor 10 sec to shut down
connMgr.shutdown(10000);
System.out.println("Done");
}
