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authorTavian Barnes <tavianator@tavianator.com>2014-09-14 23:56:51 -0400
committerTavian Barnes <tavianator@tavianator.com>2014-09-14 23:58:09 -0400
commitaf52e472b4f0b00b0d00c04b3fa54a79f94b9a49 (patch)
tree353fbadd308909d15dae5461d726e8704937d274 /sangria-lazy/src/test/java
parentbc1de44c602192e59ff66d1a5d1f1e9cdcc4a2bb (diff)
downloadsangria-af52e472b4f0b00b0d00c04b3fa54a79f94b9a49.tar.xz
lazy: Implement Lazy<T>, very much like Dagger's.
Diffstat (limited to 'sangria-lazy/src/test/java')
-rw-r--r--sangria-lazy/src/test/java/com/tavianator/sangria/lazy/LazyTest.java243
1 files changed, 243 insertions, 0 deletions
diff --git a/sangria-lazy/src/test/java/com/tavianator/sangria/lazy/LazyTest.java b/sangria-lazy/src/test/java/com/tavianator/sangria/lazy/LazyTest.java
new file mode 100644
index 0000000..ff63c03
--- /dev/null
+++ b/sangria-lazy/src/test/java/com/tavianator/sangria/lazy/LazyTest.java
@@ -0,0 +1,243 @@
+/****************************************************************************
+ * Sangria *
+ * Copyright (C) 2014 Tavian Barnes <tavianator@tavianator.com> *
+ * *
+ * 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 com.tavianator.sangria.lazy;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.util.*;
+import javax.inject.Inject;
+import javax.inject.Qualifier;
+
+import com.google.inject.AbstractModule;
+import com.google.inject.Binding;
+import com.google.inject.CreationException;
+import com.google.inject.Guice;
+import com.google.inject.Injector;
+import com.google.inject.Key;
+import com.google.inject.Module;
+import com.google.inject.spi.DefaultBindingTargetVisitor;
+import com.google.inject.spi.Element;
+import com.google.inject.spi.Elements;
+import org.junit.Test;
+
+import static org.hamcrest.Matchers.*;
+import static org.junit.Assert.*;
+
+/**
+ * Tests for {@link Lazy} injection.
+ *
+ * @author Tavian Barnes (tavianator@tavianator.com)
+ * @version 1.2
+ * @since 1.2
+ */
+public class LazyTest {
+ @Retention(RetentionPolicy.RUNTIME)
+ @Qualifier
+ private @interface Simple {
+ }
+
+ private interface Abstract {
+ }
+
+ private static class Concrete implements Abstract {
+ static final ThreadLocal<Integer> INSTANCES = new ThreadLocal<Integer>() {
+ @Override
+ protected Integer initialValue() {
+ return 0;
+ }
+ };
+
+ @Inject
+ Concrete() {
+ INSTANCES.set(INSTANCES.get() + 1);
+ }
+ }
+
+ private static class HasConcrete {
+ @Inject Lazy<Concrete> lazy;
+ }
+
+ private static class HasQualifiedAbstract {
+ @Inject @Simple Lazy<Abstract> lazy;
+ }
+
+ @Test
+ public void testJustInTime() {
+ testHasConcrete(Guice.createInjector());
+ }
+
+ @Test
+ public void testExplicitBindings() {
+ testHasConcrete(Guice.createInjector(new AbstractModule() {
+ @Override
+ protected void configure() {
+ binder().requireExplicitBindings();
+
+ bind(Concrete.class);
+ LazyBinder.create(binder())
+ .bind(Concrete.class);
+ }
+ }));
+ }
+
+ private void testHasConcrete(Injector injector) {
+ int before = Concrete.INSTANCES.get();
+
+ HasConcrete hasConcrete = new HasConcrete();
+ injector.injectMembers(hasConcrete);
+ assertThat(Concrete.INSTANCES.get(), equalTo(before));
+
+ Concrete instance = hasConcrete.lazy.get();
+ assertThat(Concrete.INSTANCES.get(), equalTo(before + 1));
+
+ Concrete instance2 = hasConcrete.lazy.get();
+ assertThat(instance2, sameInstance(instance));
+ assertThat(Concrete.INSTANCES.get(), equalTo(before + 1));
+
+ HasConcrete hasConcrete2 = new HasConcrete();
+ injector.injectMembers(hasConcrete2);
+ assertThat(Concrete.INSTANCES.get(), equalTo(before + 1));
+
+ Concrete instance3 = hasConcrete2.lazy.get();
+ assertThat(instance3, not(sameInstance(instance)));
+ assertThat(Concrete.INSTANCES.get(), equalTo(before + 2));
+ }
+
+ @Test
+ public void testBindSeparately() {
+ testQualifiedAbstract(Guice.createInjector(new AbstractModule() {
+ @Override
+ protected void configure() {
+ bind(Abstract.class)
+ .annotatedWith(Simple.class)
+ .to(Concrete.class);
+
+ LazyBinder.create(binder())
+ .bind(Abstract.class)
+ .annotatedWith(Simple.class);
+ }
+ }));
+ }
+
+ @Test
+ public void testBindTogether() {
+ testQualifiedAbstract(Guice.createInjector(new AbstractModule() {
+ @Override
+ protected void configure() {
+ LazyBinder.create(binder())
+ .bind(Abstract.class)
+ .annotatedWith(Simple.class)
+ .to(Concrete.class);
+ }
+ }));
+ }
+
+ private void testQualifiedAbstract(Injector injector) {
+ int before = Concrete.INSTANCES.get();
+
+ HasQualifiedAbstract hasQualifiedAbstract = new HasQualifiedAbstract();
+ injector.injectMembers(hasQualifiedAbstract);
+ assertThat(Concrete.INSTANCES.get(), equalTo(before));
+
+ Abstract instance = hasQualifiedAbstract.lazy.get();
+ assertThat(Concrete.INSTANCES.get(), equalTo(before + 1));
+
+ Abstract instance2 = hasQualifiedAbstract.lazy.get();
+ assertThat(instance2, sameInstance(instance2));
+ assertThat(Concrete.INSTANCES.get(), equalTo(before + 1));
+
+ HasQualifiedAbstract hasQualifiedAbstract2 = new HasQualifiedAbstract();
+ injector.injectMembers(hasQualifiedAbstract2);
+ assertThat(Concrete.INSTANCES.get(), equalTo(before + 1));
+
+ Abstract instance3 = hasQualifiedAbstract2.lazy.get();
+ assertThat(instance3, not(sameInstance(instance)));
+ assertThat(Concrete.INSTANCES.get(), equalTo(before + 2));
+ }
+
+ @Test(expected = CreationException.class)
+ public void testMissingBinding() {
+ Guice.createInjector(new AbstractModule() {
+ @Override
+ protected void configure() {
+ LazyBinder.create(binder())
+ .bind(Abstract.class);
+ }
+ });
+ }
+
+ @Test(expected = CreationException.class)
+ public void testMissingQualifiedBinding() {
+ Guice.createInjector(new AbstractModule() {
+ @Override
+ protected void configure() {
+ LazyBinder.create(binder())
+ .bind(Abstract.class)
+ .annotatedWith(Simple.class);
+ }
+ });
+ }
+
+ private static class TestVisitor<T> extends DefaultBindingTargetVisitor<T, Boolean> implements LazyBindingVisitor<T, Boolean> {
+ @Override
+ public Boolean visit(LazyBinding<? extends T> binding) {
+ assertThat(binding.getTargetKey().equals(new Key<Abstract>(Simple.class) { }), is(true));
+ return true;
+ }
+
+ @Override
+ protected Boolean visitOther(Binding<? extends T> binding) {
+ return false;
+ }
+ }
+
+ private <T> boolean visit(Binding<T> binding) {
+ return binding.acceptTargetVisitor(new TestVisitor<T>());
+ }
+
+ @Test
+ public void testExtensionSpi() {
+ Module module = new AbstractModule() {
+ @Override
+ protected void configure() {
+ // TODO: Expose the SPI for unqualified bindings
+ LazyBinder.create(binder())
+ .bind(Abstract.class)
+ .annotatedWith(Simple.class)
+ .to(Concrete.class);
+ }
+ };
+
+ List<Element> elements = Elements.getElements(module);
+
+ int passed = 0;
+ for (Element element : elements) {
+ if (element instanceof Binding) {
+ if (visit((Binding<?>)element)) {
+ ++passed;
+ }
+ }
+ }
+ assertThat(passed, equalTo(1));
+
+ Injector injector = Guice.createInjector(Elements.getModule(elements));
+ assertThat(visit(injector.getBinding(new Key<Lazy<Abstract>>(Simple.class) { })), is(true));
+ assertThat(visit(injector.getBinding(new Key<Abstract>(Simple.class) { })), is(false));
+ assertThat(visit(injector.getBinding(new Key<Concrete>() { })), is(false));
+ }
+}