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servicetalk-loadbalancer/src/main/java/io/servicetalk/loadbalancer/DefaultHost.java
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servicetalk-loadbalancer/src/main/java/io/servicetalk/loadbalancer/Host.java
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servicetalk-loadbalancer/src/test/java/io/servicetalk/loadbalancer/P2CSelectorTest.java
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * Copyright © 2023 Apple Inc. and the ServiceTalk project authors | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package io.servicetalk.loadbalancer; | ||
|
|
||
| import io.servicetalk.client.api.NoActiveHostException; | ||
| import io.servicetalk.concurrent.api.Single; | ||
| import org.junit.jupiter.api.BeforeEach; | ||
| import org.junit.jupiter.api.RepeatedTest; | ||
| import org.junit.jupiter.api.Test; | ||
| import org.junit.jupiter.params.ParameterizedTest; | ||
| import org.junit.jupiter.params.provider.ValueSource; | ||
|
|
||
| import javax.annotation.Nullable; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.Random; | ||
| import java.util.concurrent.ExecutionException; | ||
| import java.util.function.Predicate; | ||
|
|
||
| import static org.hamcrest.MatcherAssert.assertThat; | ||
| import static org.hamcrest.Matchers.either; | ||
| import static org.hamcrest.Matchers.equalTo; | ||
| import static org.hamcrest.Matchers.isA; | ||
| import static org.junit.jupiter.api.Assertions.assertThrows; | ||
| import static org.mockito.ArgumentMatchers.any; | ||
| import static org.mockito.ArgumentMatchers.anyBoolean; | ||
| import static org.mockito.Mockito.mock; | ||
| import static org.mockito.Mockito.when; | ||
|
|
||
| class P2CSelectorTest { | ||
|
|
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| private static final Predicate<TestLoadBalancedConnection> PREDICATE = (ignored) -> true; | ||
| private Random random; | ||
| private P2CSelector<String, TestLoadBalancedConnection> selector; | ||
|
|
||
| @BeforeEach | ||
| void init() { | ||
| init(5, random); | ||
| } | ||
|
|
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| void init(int maxEffort, @Nullable Random random) { | ||
| selector = new P2CSelector<>("testResource", maxEffort, random); | ||
| } | ||
|
|
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| private Host mockHost(String addr, TestLoadBalancedConnection connection) { | ||
| Host<String, TestLoadBalancedConnection> host = mock(Host.class); | ||
| when(host.address()).thenReturn(addr); | ||
| when(host.isUnhealthy()).thenReturn(true); | ||
| when(host.isActiveAndHealthy()).thenReturn(true); | ||
| when(host.pickConnection(any(), any())).thenReturn(connection); | ||
| when(host.newConnection(any(), anyBoolean(), any())).thenReturn(Single.succeeded(connection)); | ||
| return host; | ||
| } | ||
|
|
||
| private List<Host<String, TestLoadBalancedConnection>> connections(String... addresses) { | ||
| final List<Host<String, TestLoadBalancedConnection>> results = new ArrayList<>(addresses.length); | ||
| for (String addr : addresses) { | ||
| results.add(mockHost(addr, TestLoadBalancedConnection.mockConnection(addr))); | ||
| } | ||
| return results; | ||
| } | ||
|
|
||
| @ParameterizedTest(name = "{displayName} [{index}]: forceNewConnection={0}") | ||
| @ValueSource(booleans = {false, true}) | ||
| void singleHost(boolean forceNewConnection) throws Exception { | ||
| List<Host<String, TestLoadBalancedConnection>> hosts = connections("addr-1"); | ||
| TestLoadBalancedConnection connection = selector.selectConnection( | ||
| hosts, PREDICATE, null, forceNewConnection).toFuture().get(); | ||
| assertThat(connection.address(), equalTo("addr-1")); | ||
| } | ||
|
|
||
| @ParameterizedTest(name = "{displayName} [{index}]: forceNewConnection={0}") | ||
| @ValueSource(booleans = {false, true}) | ||
| void singleUnhealthyHostWithConnection(boolean forceNewConnection) throws Exception { | ||
| List<Host<String, TestLoadBalancedConnection>> hosts = connections("addr-1"); | ||
| when(hosts.get(0).isActiveAndHealthy()).thenReturn(false); | ||
| if (forceNewConnection) { | ||
| Exception e = assertThrows(ExecutionException.class, () -> selector.selectConnection( | ||
| hosts, PREDICATE, null, forceNewConnection).toFuture().get()); | ||
| assertThat(e.getCause(), isA(NoActiveHostException.class)); | ||
| } else { | ||
| TestLoadBalancedConnection connection = selector.selectConnection( | ||
| hosts, PREDICATE, null, forceNewConnection).toFuture().get(); | ||
| assertThat(connection.address(), equalTo("addr-1")); | ||
| } | ||
| } | ||
|
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||
| @ParameterizedTest(name = "{displayName} [{index}]: forceNewConnection={0}") | ||
| @ValueSource(booleans = {false, true}) | ||
| void singleUnhealthyHostWithoutConnection(boolean forceNewConnection) { | ||
| List<Host<String, TestLoadBalancedConnection>> hosts = connections("addr-1"); | ||
| when(hosts.get(0).isActiveAndHealthy()).thenReturn(false); | ||
| when(hosts.get(0).pickConnection(any(), any())).thenReturn(null); | ||
| Exception e = assertThrows(ExecutionException.class, () -> selector.selectConnection( | ||
| hosts, PREDICATE, null, forceNewConnection).toFuture().get()); | ||
| assertThat(e.getCause(), isA(NoActiveHostException.class)); | ||
| } | ||
|
|
||
| @ParameterizedTest(name = "{displayName} [{index}]: forceNewConnection={0}") | ||
| @ValueSource(booleans = {false, true}) | ||
| void twoHealthyHosts(boolean forceNewConnection) throws Exception { | ||
| List<Host<String, TestLoadBalancedConnection>> hosts = connections("addr-1", "addr-2"); | ||
| TestLoadBalancedConnection connection = selector.selectConnection( | ||
| hosts, PREDICATE, null, forceNewConnection).toFuture().get(); | ||
| assertThat(connection.address(), either(equalTo("addr-1")).or(equalTo("addr-2"))); | ||
| } | ||
|
|
||
| @Test | ||
| void twoUnHealthyHostsWithConnections() throws Exception { | ||
| List<Host<String, TestLoadBalancedConnection>> hosts = connections("addr-1", "addr-2"); | ||
| for (Host<String, TestLoadBalancedConnection> host : hosts) { | ||
| when(host.isActiveAndHealthy()).thenReturn(false); | ||
| } | ||
| TestLoadBalancedConnection connection = selector.selectConnection( | ||
| hosts, PREDICATE, null, false).toFuture().get(); | ||
| assertThat(connection.address(), either(equalTo("addr-1")).or(equalTo("addr-2"))); | ||
| } | ||
|
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| @Test | ||
| void twoUnHealthyHostsWithoutConnections() { | ||
| List<Host<String, TestLoadBalancedConnection>> hosts = connections("addr-1", "addr-2"); | ||
| for (Host<String, TestLoadBalancedConnection> host : hosts) { | ||
| when(host.isActiveAndHealthy()).thenReturn(false); | ||
| when(host.pickConnection(any(), any())).thenReturn(null); | ||
| } | ||
| Exception e = assertThrows(ExecutionException.class, () -> selector.selectConnection( | ||
| hosts, PREDICATE, null, false).toFuture().get()); | ||
| assertThat(e.getCause(), isA(NoActiveHostException.class)); | ||
| } | ||
|
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| @RepeatedTest(100) | ||
| void doesntBiasTowardHostsWithConnections() throws Exception { | ||
| List<Host<String, TestLoadBalancedConnection>> hosts = connections("addr-1", "addr-2"); | ||
| // we setup the first host to always be preferred by score, but it also doesn't have any connections. | ||
| when(hosts.get(0).pickConnection(any(), any())).thenReturn(null); | ||
| when(hosts.get(0).score()).thenReturn(10); | ||
| TestLoadBalancedConnection connection = selector.selectConnection( | ||
| hosts, PREDICATE, null, false).toFuture().get(); | ||
| assertThat(connection.address(), equalTo("addr-1")); | ||
| } | ||
|
|
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| @RepeatedTest(100) | ||
| void biasesTowardsActiveAndHealthyHostWhenNoConnections() throws Exception { | ||
| List<Host<String, TestLoadBalancedConnection>> hosts = connections("addr-1", "addr-2"); | ||
| when(hosts.get(0).isActiveAndHealthy()).thenReturn(false); | ||
| TestLoadBalancedConnection connection = selector.selectConnection( | ||
| hosts, PREDICATE, null, true).toFuture().get(); | ||
| assertThat(connection.address(), equalTo("addr-2")); | ||
| } | ||
|
|
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| @RepeatedTest(100) | ||
| void biasesTowardTheHighestWeightHostForNewConnections() throws Exception { | ||
| biasesTowardTheHighestWeightHost(true); | ||
| } | ||
|
|
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| @RepeatedTest(100) | ||
| void biasesTowardTheHighestWeightHostForExistingConnections() throws Exception { | ||
| biasesTowardTheHighestWeightHost(false); | ||
| } | ||
|
|
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| void biasesTowardTheHighestWeightHost(boolean forceNewConnection) throws Exception { | ||
| List<Host<String, TestLoadBalancedConnection>> hosts = connections("addr-1", "addr-2"); | ||
| // Host 0 has the highest score so it should always get the new connection. | ||
| when(hosts.get(0).score()).thenReturn(10); | ||
| TestLoadBalancedConnection connection = selector.selectConnection( | ||
| hosts, PREDICATE, null, forceNewConnection).toFuture().get(); | ||
| assertThat(connection.address(), equalTo("addr-1")); | ||
| } | ||
| } |
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43
...lk-loadbalancer/src/test/java/io/servicetalk/loadbalancer/TestLoadBalancedConnection.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| /* | ||
| * Copyright © 2023 Apple Inc. and the ServiceTalk project authors | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package io.servicetalk.loadbalancer; | ||
|
|
||
| import io.servicetalk.client.api.LoadBalancedConnection; | ||
| import io.servicetalk.concurrent.api.ListenableAsyncCloseable; | ||
|
|
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| import static io.servicetalk.concurrent.api.AsyncCloseables.emptyAsyncCloseable; | ||
| import static org.mockito.Mockito.mock; | ||
| import static org.mockito.Mockito.when; | ||
|
|
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| interface TestLoadBalancedConnection extends LoadBalancedConnection { | ||
| String address(); | ||
|
|
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| static TestLoadBalancedConnection mockConnection(final String address) { | ||
| return mockConnection(address, emptyAsyncCloseable()); | ||
| } | ||
|
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| static TestLoadBalancedConnection mockConnection(final String address, final ListenableAsyncCloseable closeable) { | ||
| final TestLoadBalancedConnection cnx = mock(TestLoadBalancedConnection.class); | ||
| when(cnx.closeAsync()).thenReturn(closeable.closeAsync()); | ||
| when(cnx.closeAsyncGracefully()).thenReturn(closeable.closeAsyncGracefully()); | ||
| when(cnx.onClose()).thenReturn(closeable.onClose()); | ||
| when(cnx.onClosing()).thenReturn(closeable.onClosing()); | ||
| when(cnx.address()).thenReturn(address); | ||
| when(cnx.toString()).thenReturn(address + '@' + cnx.hashCode()); | ||
| when(cnx.tryReserve()).thenReturn(true); | ||
| return cnx; | ||
| } | ||
| } |