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Merge pull request #6 from gastaldi/FURNACE-74
FURNACE-74: SimpleContainer now supports Producers
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49
api/src/main/java/org/jboss/forge/furnace/container/simple/Producer.java
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| /* | ||
| * Copyright 2014 Red Hat, Inc. and/or its affiliates. | ||
| * | ||
| * Licensed under the Eclipse Public License version 1.0, available at | ||
| * http://www.eclipse.org/legal/epl-v10.html | ||
| */ | ||
| package org.jboss.forge.furnace.container.simple; | ||
|
|
||
| /** | ||
| * Interface used to register a Service to be a producer. | ||
| * | ||
| * <p> | ||
| * To register a {@link Producer}, register it as a {@link Service} or {@link SingletonService}. | ||
| * <p> | ||
| * | ||
| * <pre> | ||
| * public class ExampleService extends ProducerService<MyObject> | ||
| * { | ||
| * @Override | ||
| * public MyObject get() | ||
| * { | ||
| * // r MyObject | ||
| * } | ||
| * } | ||
| * </pre> | ||
| * <p> | ||
| * Example registration file: | ||
| * </p> | ||
| * | ||
| * <pre> | ||
| * META-INF/services/org.jboss.forge.furnace.container.simple.Service | ||
| * ------- | ||
| * org.example.ExampleService | ||
| * org.example.ExampleService2 | ||
| * org.my.custom.MyService | ||
| * ------- | ||
| * </pre> | ||
| * | ||
| * | ||
| * <h2>Warning: from JDK 1.8.0_20 onwards, javac changed its behavior in order to check for transitive references. | ||
| * Producer services must NEVER be directly accessed outside of the addon in which they are defined. See | ||
| * <a href="https://issues.jboss.org/browse/FORGE-2019">this link</a> for more information</h2> | ||
| * | ||
| * @author <a href="mailto:ggastald@redhat.com">George Gastaldi</a> | ||
| */ | ||
| public interface Producer<T> | ||
| { | ||
| T get(); | ||
| } |
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131 changes: 131 additions & 0 deletions
131
...in/java/org/jboss/forge/furnace/container/simple/impl/SimpleProducerExportedInstance.java
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| /* | ||
| * Copyright 2013 Red Hat, Inc. and/or its affiliates. | ||
| * | ||
| * Licensed under the Eclipse Public License version 1.0, available at | ||
| * http://www.eclipse.org/legal/epl-v10.html | ||
| */ | ||
| package org.jboss.forge.furnace.container.simple.impl; | ||
|
|
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| import org.jboss.forge.furnace.addons.Addon; | ||
| import org.jboss.forge.furnace.container.simple.Producer; | ||
| import org.jboss.forge.furnace.exception.ContainerException; | ||
| import org.jboss.forge.furnace.proxy.ClassLoaderInterceptor; | ||
| import org.jboss.forge.furnace.proxy.Proxies; | ||
| import org.jboss.forge.furnace.spi.ExportedInstance; | ||
|
|
||
| /** | ||
| * @author <a href="mailto:lincolnbaxter@gmail.com">Lincoln Baxter, III</a> | ||
| * | ||
| */ | ||
| public class SimpleProducerExportedInstance<T> implements ExportedInstance<T> | ||
| { | ||
| private final Addon addon; | ||
| private final Class<T> type; | ||
| private final Class<? extends Producer<T>> producer; | ||
| private final boolean singleton; | ||
| private T delegate; | ||
|
|
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| public SimpleProducerExportedInstance(Addon addon, Class<T> type, Class<? extends Producer<T>> producer, | ||
| boolean singleton) | ||
| { | ||
| this.addon = addon; | ||
| this.type = type; | ||
| this.producer = producer; | ||
| this.singleton = singleton; | ||
| } | ||
|
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| @Override | ||
| public T get() | ||
| { | ||
| if (singleton) | ||
| { | ||
| if (delegate == null) | ||
| { | ||
| delegate = newInstance(); | ||
| } | ||
| return delegate; | ||
| } | ||
| else | ||
| { | ||
| return newInstance(); | ||
| } | ||
| } | ||
|
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| private T newInstance() | ||
| { | ||
| try | ||
| { | ||
| T delegate = producer.newInstance().get(); | ||
| delegate = Proxies.enhance(addon.getClassLoader(), delegate, | ||
| new ClassLoaderInterceptor(addon.getClassLoader(), | ||
| delegate)); | ||
| return delegate; | ||
| } | ||
| catch (Exception e) | ||
| { | ||
| throw new ContainerException("Could not create instance of [" + type.getName() + "] through reflection.", | ||
| e); | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| public void release(T instance) | ||
| { | ||
| // no action required | ||
| } | ||
|
|
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| @Override | ||
| public String toString() | ||
| { | ||
| return type.getName() + " from " + addon; | ||
| } | ||
|
|
||
| @Override | ||
| public Class<? extends T> getActualType() | ||
| { | ||
| return type; | ||
| } | ||
|
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| @Override | ||
| public Addon getSourceAddon() | ||
| { | ||
| return addon; | ||
| } | ||
|
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| @Override | ||
| public int hashCode() | ||
| { | ||
| final int prime = 31; | ||
| int result = 1; | ||
| result = prime * result + ((addon == null) ? 0 : addon.hashCode()); | ||
| result = prime * result + ((type == null) ? 0 : type.hashCode()); | ||
| return result; | ||
| } | ||
|
|
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| @Override | ||
| public boolean equals(Object obj) | ||
| { | ||
| if (this == obj) | ||
| return true; | ||
| if (obj == null) | ||
| return false; | ||
| if (getClass() != obj.getClass()) | ||
| return false; | ||
| SimpleProducerExportedInstance other = (SimpleProducerExportedInstance) obj; | ||
| if (addon == null) | ||
| { | ||
| if (other.addon != null) | ||
| return false; | ||
| } | ||
| else if (!addon.equals(other.addon)) | ||
| return false; | ||
| if (type == null) | ||
| { | ||
| if (other.type != null) | ||
| return false; | ||
| } | ||
| else if (!type.equals(other.type)) | ||
| return false; | ||
| return true; | ||
| } | ||
| } |
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36 changes: 36 additions & 0 deletions
36
...rc/test/java/org/jboss/forge/furnace/container/simple/impl/SimpleServiceRegistryTest.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| /** | ||
| * Copyright 2015 Red Hat, Inc. and/or its affiliates. | ||
| * | ||
| * Licensed under the Eclipse Public License version 1.0, available at | ||
| * http://www.eclipse.org/legal/epl-v10.html | ||
| */ | ||
|
|
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| package org.jboss.forge.furnace.container.simple.impl; | ||
|
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| import org.jboss.forge.furnace.container.simple.Producer; | ||
| import org.junit.Assert; | ||
| import org.junit.Test; | ||
|
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| /** | ||
| * | ||
| * @author <a href="mailto:ggastald@redhat.com">George Gastaldi</a> | ||
| */ | ||
| public class SimpleServiceRegistryTest | ||
| { | ||
|
|
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| @Test | ||
| public void testExtractProducesType() | ||
| { | ||
| Class<?> type = SimpleServiceRegistry.extractProducesType(MyProducer.class); | ||
| Assert.assertSame(String.class, type); | ||
| } | ||
|
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| class MyProducer implements Producer<String> | ||
| { | ||
| @Override | ||
| public String get() | ||
| { | ||
| return null; | ||
| } | ||
| } | ||
| } |
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