DistributedProxySelectorTest.java
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package org.apache.hc.client5.http.impl.classic;
import org.apache.hc.client5.http.impl.routing.DistributedProxySelector;
import org.junit.jupiter.api.Test;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.ProxySelector;
import java.net.SocketAddress;
import java.net.URI;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;
class DistributedProxySelectorTest {
@Test
void testConstructorThrowsExceptionWhenNullSelectors() {
assertThrows(IllegalArgumentException.class, () -> new DistributedProxySelector(null));
}
@Test
void testConstructorThrowsExceptionWhenEmptySelectors() {
assertThrows(IllegalArgumentException.class, () -> new DistributedProxySelector(Collections.emptyList()));
}
@Test
void testSelectReturnsProxyFromFirstSelector() {
final ProxySelector selector1 = new ProxySelector() {
@Override
public List<Proxy> select(final URI uri) {
return Arrays.asList(
new Proxy(Proxy.Type.HTTP, new InetSocketAddress("proxy1.example.com", 8080)),
new Proxy(Proxy.Type.HTTP, new InetSocketAddress("proxy2.example.com", 8080))
);
}
@Override
public void connectFailed(final URI uri, final SocketAddress sa, final IOException ioe) {
}
};
final ProxySelector selector2 = new ProxySelector() {
@Override
public List<Proxy> select(final URI uri) {
return Collections.singletonList(
new Proxy(Proxy.Type.HTTP, new InetSocketAddress("proxy3.example.com", 8080))
);
}
@Override
public void connectFailed(final URI uri, final SocketAddress sa, final IOException ioe) {
}
};
final DistributedProxySelector failoverSelector = new DistributedProxySelector(Arrays.asList(selector1, selector2));
final URI uri = URI.create("http://example.com");
final List<Proxy> proxies = failoverSelector.select(uri);
assertEquals(2, proxies.size());
assertEquals("proxy1.example.com", ((InetSocketAddress) proxies.get(0).address()).getHostName());
assertEquals("proxy2.example.com", ((InetSocketAddress) proxies.get(1).address()).getHostName());
}
@Test
void testSelectReturnsProxyFromSecondSelector() {
final ProxySelector selector1 = new ProxySelector() {
@Override
public List<Proxy> select(final URI uri) {
return Collections.emptyList();
}
@Override
public void connectFailed(final URI uri, final SocketAddress sa, final IOException ioe) {
}
};
final ProxySelector selector2 = new ProxySelector() {
@Override
public List<Proxy> select(final URI uri) {
return Collections.singletonList(
new Proxy(Proxy.Type.HTTP, new InetSocketAddress("proxy3.example.com", 8080))
);
}
@Override
public void connectFailed(final URI uri, final SocketAddress sa, final IOException ioe) {
}
};
final DistributedProxySelector failoverSelector = new DistributedProxySelector(Arrays.asList(selector1, selector2));
final URI uri = URI.create("http://example.com");
final List<Proxy> proxies = failoverSelector.select(uri);
assertEquals(1, proxies.size());
assertEquals("proxy3.example.com", ((InetSocketAddress) proxies.get(0).address()).getHostName());
}
@Test
void testSelectReturnsProxyFromThirdSelector() {
final ProxySelector selector1 = new ProxySelector() {
@Override
public List<Proxy> select(final URI uri) {
return Collections.emptyList();
}
@Override
public void connectFailed(final URI uri, final SocketAddress sa, final IOException ioe) {
}
};
final ProxySelector selector2 = mock(ProxySelector.class); // Create a mock object for ProxySelector
when(selector2.select(any(URI.class))).thenReturn(Collections.singletonList(
new Proxy(Proxy.Type.HTTP, new InetSocketAddress("proxy3.example.com", 8080))
));
final DistributedProxySelector proxySelector = new DistributedProxySelector(Arrays.asList(selector1, selector2));
final URI uri = URI.create("http://example.com");
final List<Proxy> proxies = proxySelector.select(uri);
// Assertions
assertEquals(1, proxies.size(), "Expecting one proxy to be returned");
assertEquals("proxy3.example.com", ((InetSocketAddress) proxies.get(0).address()).getHostName(), "Expecting proxy3.example.com to be returned");
// Verify that selector2's connectFailed() method is called when a connection fails
final SocketAddress sa = new InetSocketAddress("proxy3.example.com", 8080);
final IOException ioe = new IOException("Connection refused");
proxySelector.connectFailed(uri, sa, ioe);
verify(selector2, never()).connectFailed(uri, sa, ioe);
}
@Test
void testSelectReturnsProxyFromSecondSelectorWhenFirstSelectorReturnsEmptyList() {
final ProxySelector selector1 = new ProxySelector() {
@Override
public List<Proxy> select(final URI uri) {
return Collections.emptyList();
}
@Override
public void connectFailed(final URI uri, final SocketAddress sa, final IOException ioe) {
}
};
final ProxySelector selector2 = new ProxySelector() {
@Override
public List<Proxy> select(final URI uri) {
return Collections.singletonList(
new Proxy(Proxy.Type.HTTP, new InetSocketAddress("proxy3.example.com", 8080))
);
}
@Override
public void connectFailed(final URI uri, final SocketAddress sa, final IOException ioe) {
}
};
final DistributedProxySelector failoverSelector = new DistributedProxySelector(Arrays.asList(selector1, selector2));
final URI uri = URI.create("http://example.com");
final List<Proxy> proxies = failoverSelector.select(uri);
assertEquals(1, proxies.size());
assertEquals("proxy3.example.com", ((InetSocketAddress) proxies.get(0).address()).getHostName());
}
@Test
void testSelectHandlesException() {
final ProxySelector exceptionThrowingSelector = new ProxySelector() {
@Override
public List<Proxy> select(final URI uri) {
throw new RuntimeException("Exception for testing");
}
@Override
public void connectFailed(final URI uri, final SocketAddress sa, final IOException ioe) {
}
};
final ProxySelector workingSelector = new ProxySelector() {
@Override
public List<Proxy> select(final URI uri) {
return Collections.singletonList(
new Proxy(Proxy.Type.HTTP, new InetSocketAddress("proxy.example.com", 8080))
);
}
@Override
public void connectFailed(final URI uri, final SocketAddress sa, final IOException ioe) {
}
};
final DistributedProxySelector distributedSelector = new DistributedProxySelector(Arrays.asList(exceptionThrowingSelector, workingSelector));
final URI uri = URI.create("http://example.com");
final List<Proxy> proxies = distributedSelector.select(uri);
assertEquals(1, proxies.size());
assertEquals("proxy.example.com", ((InetSocketAddress) proxies.get(0).address()).getHostName());
}
}