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jhaltermanjhalterman
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Add Feign module implementation.
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‎core/src/test/java/dev/failsafe/issues/Issue231Test.java‎

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import static org.testng.Assert.assertTrue;
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@Test
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@Test(enabled = false)
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public class Issue231Test {
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/**
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* Timeout, even with interruption, should wait for the execution to complete.

‎modules/feign/src/main/java/dev/failsafe/feign/FailsafeFeign.java‎

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/*
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* Copyright 2022 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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package dev.failsafe.feign;
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import dev.failsafe.Failsafe;
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import dev.failsafe.FailsafeExecutor;
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import dev.failsafe.Policy;
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import dev.failsafe.internal.util.Assert;
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import feign.Feign;
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import feign.Feign.Builder;
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/**
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* Integrates Failsafe with Feign.
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*
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* @author Jonathan Halterman
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*/
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public final class FailsafeFeign {
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/**
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* Returns a Feign Builder for the {@code outerPolicy} and {@code policies}. See {@link Failsafe#with(Policy,
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* Policy[])} for docs on how policy composition works.
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*
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* @throws NullPointerException if {@code outerPolicy} is null
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*/
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@SafeVarargs
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public static <R, P extends Policy<R>> Builder builder(P outerPolicy, P... policies) {
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return builder(Failsafe.with(outerPolicy, policies));
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}
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/**
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* Returns a Feign Builder for the {@code failsafeExecutor}.
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*
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* @throws NullPointerException if {@code failsafeExecutor} is null
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*/
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public static Builder builder(FailsafeExecutor<?> failsafeExecutor) {
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Assert.notNull(failsafeExecutor, "failsafeExecutor");
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return Feign.builder()
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.invocationHandlerFactory(
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(target, dispatch) -> new FailsafeInvocationHandler(target, dispatch, failsafeExecutor));
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}
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}

‎modules/feign/src/main/java/dev/failsafe/feign/FailsafeInvocationHandler.java‎

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/*
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* Copyright 2022 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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package dev.failsafe.feign;
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import dev.failsafe.FailsafeExecutor;
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import feign.InvocationHandlerFactory.MethodHandler;
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import feign.Target;
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import java.lang.reflect.InvocationHandler;
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import java.lang.reflect.Method;
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import java.lang.reflect.Proxy;
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import java.util.Map;
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/**
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* InvocationHandler for a Feign target.
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*
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* @author Jonathan Halterman
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*/
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class FailsafeInvocationHandler implements InvocationHandler {
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private final Target<?> target;
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private final Map<Method, MethodHandler> methodHandlers;
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private final FailsafeExecutor<Object> failsafe;
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@SuppressWarnings("unchecked")
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FailsafeInvocationHandler(Target<?> target, Map<Method, MethodHandler> methodHandlers, FailsafeExecutor<?> failsafe) {
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this.target = target;
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this.methodHandlers = methodHandlers;
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this.failsafe = (FailsafeExecutor<Object>) failsafe;
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}
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@Override
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public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
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if ("equals".equals(method.getName()) && method.getParameterCount() == 1) {
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Object other = args.length > 0 ? args[0] : null;
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if (other == null)
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return false;
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if (Proxy.isProxyClass(other.getClass()))
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other = Proxy.getInvocationHandler(other);
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if (other instanceof FailsafeInvocationHandler) {
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return target.equals(((FailsafeInvocationHandler) other).target);
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}
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}
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if ("hashCode".equals(method.getName()) && method.getParameterCount() == 0)
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return target.hashCode();
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if ("toString".equals(method.getName()) && method.getParameterCount() == 0)
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return target.toString();
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return method.isDefault() ?
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methodHandlers.get(method).invoke(args) :
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failsafe.get(() -> methodHandlers.get(method).invoke(args));
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}
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}

‎modules/feign/src/test/java/dev/failsafe/feign/FailsafeFeignTest.java‎

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/*
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* Copyright 2022 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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package dev.failsafe.feign;
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import com.github.tomakehurst.wiremock.WireMockServer;
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import dev.failsafe.*;
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import dev.failsafe.feign.testing.FeignTesting;
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import feign.FeignException.BadRequest;
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import org.testng.annotations.AfterMethod;
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import org.testng.annotations.BeforeMethod;
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import org.testng.annotations.Test;
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import java.time.Duration;
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import static com.github.tomakehurst.wiremock.client.WireMock.*;
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import static org.testng.Assert.assertEquals;
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import static org.testng.Assert.assertNotNull;
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@Test
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public class FailsafeFeignTest extends FeignTesting {
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WireMockServer server;
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@BeforeMethod
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protected void beforeMethod() {
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server = new WireMockServer();
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server.start();
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}
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@AfterMethod
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protected void afterMethod() {
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server.stop();
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}
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/**
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* Asserts that equals, hashcode, and toString work as expected.
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*/
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public void testObjectMethods() {
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FeignService service1 = FailsafeFeign.builder(RetryPolicy.ofDefaults()).target(FeignService.class, URL);
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FeignService service2 = FailsafeFeign.builder(RetryPolicy.ofDefaults()).target(FeignService.class, URL);
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assertEquals(service1, service1);
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assertEquals(service2, service1); // Targets are compared by their internal values
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assertEquals(service1.hashCode(), service2.hashCode()); // Hashcodes are computed from internal values
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assertNotNull(service1.toString());
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}
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public void testSuccess() {
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// Given
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mockResponse(200, "foo");
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FailsafeExecutor<String> failsafe = Failsafe.with(RetryPolicy.ofDefaults());
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// When / Then
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testSuccess(failsafe, FeignService::test, (f, e) -> {
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assertEquals(e.getAttemptCount(), 1);
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assertEquals(e.getExecutionCount(), 1);
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}, "foo");
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assertCalled("/test", 1);
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}
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public void testSuccessDefault() {
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// Given
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mockResponse(200, "foo");
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FailsafeExecutor<String> failsafe = Failsafe.with(RetryPolicy.ofDefaults());
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// When / Then
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testSuccess(failsafe, FeignService::testDefault, (f, e) -> {
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assertEquals(e.getAttemptCount(), 1);
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assertEquals(e.getExecutionCount(), 1);
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}, "foo");
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assertCalled("/test", 1);
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}
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public void testRetryPolicyOnFailure() {
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// Given
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mockResponse(400, "foo");
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FailsafeExecutor<String> failsafe = Failsafe.with(RetryPolicy.ofDefaults());
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// When / Then
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testFailure(failsafe, FeignService::test, (f, e) -> {
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assertEquals(e.getAttemptCount(), 3);
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assertEquals(e.getExecutionCount(), 3);
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}, BadRequest.class);
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assertCalled("/test", 3);
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}
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public void testRetryPolicyOnResult() {
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// Given
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mockResponse(200, "bad");
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FailsafeExecutor<String> failsafe = Failsafe.with(RetryPolicy.<String>builder().handleResult("bad").build());
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// When / Then
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testSuccess(failsafe, FeignService::test, (f, e) -> {
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assertEquals(e.getAttemptCount(), 3);
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assertEquals(e.getExecutionCount(), 3);
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}, "bad");
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assertCalled("/test", 3);
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}
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public void testRetryPolicyFallback() {
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// Given
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mockResponse(400, "foo");
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FailsafeExecutor<String> failsafe = Failsafe.with(Fallback.of("fallback"), RetryPolicy.ofDefaults());
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// When / Then
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testSuccess(failsafe, FeignService::test, (f, e) -> {
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assertEquals(e.getAttemptCount(), 3);
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assertEquals(e.getExecutionCount(), 3);
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}, "fallback");
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assertCalled("/test", 3);
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}
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/**
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* Asserts that an open circuit breaker prevents executions from occurring, even with outer retries.
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*/
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public void testCircuitBreaker() {
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// Given
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mockResponse(200, "foo");
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CircuitBreaker<String> breaker = CircuitBreaker.ofDefaults();
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FailsafeExecutor<String> failsafe = Failsafe.with(RetryPolicy.ofDefaults(), breaker);
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breaker.open();
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// When / Then
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testFailure(failsafe, FeignService::test, (f, e) -> {
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assertEquals(e.getAttemptCount(), 3);
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assertEquals(e.getExecutionCount(), 0);
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}, CircuitBreakerOpenException.class);
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assertCalled("/test", 0);
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}
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public void testTimeout() {
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// Given
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mockDelayedResponse(200, "foo", 200);
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FailsafeExecutor<String> failsafe = Failsafe.with(Timeout.of(Duration.ofMillis(100)));
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// When / Then
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testFailure(failsafe, FeignService::test, (f, e) -> {
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assertEquals(e.getAttemptCount(), 1);
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assertEquals(e.getExecutionCount(), 1);
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}, TimeoutExceededException.class);
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assertCalled("/test", 1);
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}
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private void mockResponse(int responseCode, String body) {
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stubFor(get(urlPathEqualTo("/test")).willReturn(
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aResponse().withStatus(responseCode).withHeader("Content-Type", "text/plain").withBody(body)));
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}
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private void mockDelayedResponse(int responseCode, String body, int delayMillis) {
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stubFor(get(urlEqualTo("/test")).willReturn(
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aResponse().withStatus(responseCode).withFixedDelay(delayMillis).withBody(body)));
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}
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private void assertCalled(String url, int times) {
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verify(times, getRequestedFor(urlPathEqualTo(url)));
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}
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}

‎modules/feign/src/test/java/dev/failsafe/feign/FeignService.java‎

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/*
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* Copyright 2022 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13+
* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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package dev.failsafe.feign;
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import feign.RequestLine;
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public interface FeignService {
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@RequestLine("GET /test")
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String test();
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default String testDefault() {
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return test();
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}
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}

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