TestStatefulConnManagement.java
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package org.apache.hc.client5.testing.sync;
import org.apache.hc.client5.http.UserTokenHandler;
import org.apache.hc.client5.http.classic.methods.HttpGet;
import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
import org.apache.hc.client5.http.impl.io.PoolingHttpClientConnectionManager;
import org.apache.hc.client5.http.protocol.HttpClientContext;
import org.apache.hc.client5.testing.extension.sync.ClientProtocolLevel;
import org.apache.hc.client5.testing.extension.sync.TestClient;
import org.apache.hc.core5.http.ClassicHttpRequest;
import org.apache.hc.core5.http.ClassicHttpResponse;
import org.apache.hc.core5.http.EndpointDetails;
import org.apache.hc.core5.http.HttpHost;
import org.apache.hc.core5.http.HttpStatus;
import org.apache.hc.core5.http.URIScheme;
import org.apache.hc.core5.http.io.HttpRequestHandler;
import org.apache.hc.core5.http.io.entity.EntityUtils;
import org.apache.hc.core5.http.io.entity.StringEntity;
import org.apache.hc.core5.http.protocol.HttpContext;
import org.apache.hc.core5.util.Timeout;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
/**
* Test cases for state-ful connections.
*/
class TestStatefulConnManagement extends AbstractIntegrationTestBase {
public static final Timeout LONG_TIMEOUT = Timeout.ofMinutes(3);
public TestStatefulConnManagement() {
super(URIScheme.HTTP, ClientProtocolLevel.STANDARD);
}
private static class SimpleService implements HttpRequestHandler {
public SimpleService() {
super();
}
@Override
public void handle(
final ClassicHttpRequest request,
final ClassicHttpResponse response,
final HttpContext context) {
response.setCode(HttpStatus.SC_OK);
final StringEntity entity = new StringEntity("Whatever");
response.setEntity(entity);
}
}
@Test
void testStatefulConnections() throws Exception {
configureServer(bootstrap -> bootstrap
.register("*", new SimpleService()));
final HttpHost target = startServer();
final int workerCount = 5;
final int requestCount = 5;
final UserTokenHandler userTokenHandler = (route, context) -> {
final String id = (String) context.getAttribute("user");
return id;
};
configureClient(builder -> builder
.setUserTokenHandler(userTokenHandler));
final TestClient client = client();
final PoolingHttpClientConnectionManager connectionManager = client.getConnectionManager();
connectionManager.setMaxTotal(workerCount);
connectionManager.setDefaultMaxPerRoute(workerCount);
final HttpClientContext[] contexts = new HttpClientContext[workerCount];
final HttpWorker[] workers = new HttpWorker[workerCount];
for (int i = 0; i < contexts.length; i++) {
final HttpClientContext context = HttpClientContext.create();
contexts[i] = context;
workers[i] = new HttpWorker(
"user" + i,
context, requestCount, target, client);
}
for (final HttpWorker worker : workers) {
worker.start();
}
for (final HttpWorker worker : workers) {
worker.join(LONG_TIMEOUT.toMilliseconds());
}
for (final HttpWorker worker : workers) {
final Exception ex = worker.getException();
if (ex != null) {
throw ex;
}
Assertions.assertEquals(requestCount, worker.getCount());
}
for (final HttpContext context : contexts) {
final String state0 = (String) context.getAttribute("r0");
Assertions.assertNotNull(state0);
for (int r = 1; r < requestCount; r++) {
Assertions.assertEquals(state0, context.getAttribute("r" + r));
}
}
}
static class HttpWorker extends Thread {
private final String uid;
private final HttpClientContext context;
private final int requestCount;
private final HttpHost target;
private final CloseableHttpClient httpclient;
private volatile Exception exception;
private volatile int count;
public HttpWorker(
final String uid,
final HttpClientContext context,
final int requestCount,
final HttpHost target,
final CloseableHttpClient httpclient) {
super();
this.uid = uid;
this.context = context;
this.requestCount = requestCount;
this.target = target;
this.httpclient = httpclient;
this.count = 0;
}
public int getCount() {
return this.count;
}
public Exception getException() {
return this.exception;
}
@Override
public void run() {
try {
this.context.setAttribute("user", this.uid);
for (int r = 0; r < this.requestCount; r++) {
final HttpGet httpget = new HttpGet("/");
this.httpclient.execute(this.target, httpget, this.context, response -> {
EntityUtils.consume(response.getEntity());
return null;
});
this.count++;
final EndpointDetails endpointDetails = this.context.getEndpointDetails();
final String connuid = Integer.toHexString(System.identityHashCode(endpointDetails));
this.context.setAttribute("r" + r, connuid);
}
} catch (final Exception ex) {
this.exception = ex;
}
}
}
@Test
void testRouteSpecificPoolRecylcing() throws Exception {
configureServer(bootstrap -> bootstrap.register("*", new SimpleService()));
final HttpHost target = startServer();
// This tests what happens when a maxed connection pool needs
// to kill the last idle connection to a route to build a new
// one to the same route.
final int maxConn = 2;
configureClient(builder -> builder
.setUserTokenHandler((route, context) -> context.getAttribute("user")));
final TestClient client = client();
final PoolingHttpClientConnectionManager connectionManager = client.getConnectionManager();
connectionManager.setMaxTotal(maxConn);
connectionManager.setDefaultMaxPerRoute(maxConn);
// Bottom of the pool : a *keep alive* connection to Route 1.
final HttpContext context1 = HttpClientContext.create();
context1.setAttribute("user", "stuff");
client.execute(target, new HttpGet("/"), context1, response -> {
EntityUtils.consume(response.getEntity());
return null;
});
// The ConnPoolByRoute now has 1 free connection, out of 2 max
// The ConnPoolByRoute has one RouteSpcfcPool, that has one free connection
// for [localhost][stuff]
Thread.sleep(100);
// Send a very simple HTTP get (it MUST be simple, no auth, no proxy, no 302, no 401, ...)
// Send it to another route. Must be a keepalive.
final HttpContext context2 = HttpClientContext.create();
client.execute(new HttpHost("127.0.0.1", target.getPort()), new HttpGet("/"), context2, response -> {
EntityUtils.consume(response.getEntity());
return null;
});
// ConnPoolByRoute now has 2 free connexions, out of its 2 max.
// The [localhost][stuff] RouteSpcfcPool is the same as earlier
// And there is a [127.0.0.1][null] pool with 1 free connection
Thread.sleep(100);
// This will put the ConnPoolByRoute to the targeted state :
// [localhost][stuff] will not get reused because this call is [localhost][null]
// So the ConnPoolByRoute will need to kill one connection (it is maxed out globally).
// The killed conn is the oldest, which means the first HTTPGet ([localhost][stuff]).
// When this happens, the RouteSpecificPool becomes empty.
final HttpContext context3 = HttpClientContext.create();
client.execute(target, new HttpGet("/"), context3, response -> {
EntityUtils.consume(response.getEntity());
return null;
});
// If the ConnPoolByRoute did not behave coherently with the RouteSpecificPool
// this may fail. Ex : if the ConnPool discared the route pool because it was empty,
// but still used it to build the request3 connection.
}
}