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commit 7e409ca00e07c632f645035bc1e160d2fb79cd07
Author: Andi Huber <ahu...@apache.org>
AuthorDate: Fri Feb 23 10:47:39 2018 +0100
ISIS-1871 ISIS-1755 let CDI ignore beans as specified
---
.../webapp/jee/IsisCDIBeanScanInterceptor.java | 102 +++++++++++++++++++++
.../services/javax.enterprise.inject.spi.Extension | 1 +
2 files changed, 103 insertions(+)
diff --git
a/core/runtime/src/main/java/org/apache/isis/core/webapp/jee/IsisCDIBeanScanInterceptor.java
b/core/runtime/src/main/java/org/apache/isis/core/webapp/jee/IsisCDIBeanScanInterceptor.java
new file mode 100644
index 0000000..06fe4bf
--- /dev/null
+++
b/core/runtime/src/main/java/org/apache/isis/core/webapp/jee/IsisCDIBeanScanInterceptor.java
@@ -0,0 +1,102 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 org.apache.isis.core.webapp.jee;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.Predicate;
+
+import javax.enterprise.event.Observes;
+import javax.enterprise.inject.spi.AfterBeanDiscovery;
+import javax.enterprise.inject.spi.BeforeBeanDiscovery;
+import javax.enterprise.inject.spi.Extension;
+import javax.enterprise.inject.spi.ProcessAnnotatedType;
+
+import org.apache.isis.applib.annotation.DomainService;
+import org.apache.isis.applib.services.exceprecog.ExceptionRecognizer;
+import org.apache.isis.applib.services.metrics.MetricsService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ *
+ * A CDI inject extension @see <a
href="https://docs.jboss.org/weld/reference/latest/en-US/html/extend.html";>weld</a>,
+ * that lets CDI ignore certain Beans we declare tabu.
+ * <p>
+ * This extension is registered as a service provider by creating a file named
+ * {@code META-INF/services/javax.enterprise.inject.spi.Extension},
+ * which contains the name of this extension class.
+ * </p>
+ *
+ * <p>
+ * Beans declared tabu are managed (meaning instantiation and dependency
injection)
+ * by Isis itself. All other Beans are allowed to be managed by CDI.
+ * </p>
+ *
+ * @author ahu...@apache.org
+ *
+ */
+public final class IsisCDIBeanScanInterceptor implements Extension {
+
+ private static final Logger log =
LoggerFactory.getLogger(IsisCDIBeanScanInterceptor.class);
+
+ /**
+ * Declaration of Beans that are managed by Isis and should be ignored
by CDI.
+ * (in addition to those that have the @DomainService annotation)
+ */
+ private static final List<Predicate<Class<?>>> tabu = new ArrayList<>();
+ {
+ tabu.add(MetricsService.class::equals);
+ tabu.add(ExceptionRecognizer.class::isAssignableFrom);
+ }
+
+ void beforeBeanDiscovery(@Observes BeforeBeanDiscovery event) {
+ log.info("beginning the scanning process");
+ }
+
+ <T> void processAnnotatedType(@Observes ProcessAnnotatedType<T> event) {
+
+ final Class<?> clazz = event.getAnnotatedType().getJavaClass();
+ final String className = clazz.getName();
+
+ if(isTabu(clazz, event)) {
+ log.debug("veto type: " + className);
+ event.veto();
+ } else {
+ log.debug("allowing type: " + className);
+ }
+ }
+
+ void afterBeanDiscovery(@Observes AfterBeanDiscovery event) {
+ log.info("finished the scanning process");
+ }
+
+ // -- HELPER
+
+ private boolean isTabu(Class<?> clazz, ProcessAnnotatedType<?> event) {
+
if(event.getAnnotatedType().isAnnotationPresent(DomainService.class))
+ return true;
+ for(Predicate<Class<?>> isTabu : tabu) {
+ if(isTabu.test(clazz))
+ return true;
+ }
+ return false;
+ }
+
+}
diff --git
a/core/runtime/src/main/resources/META-INF/services/javax.enterprise.inject.spi.Extension
b/core/runtime/src/main/resources/META-INF/services/javax.enterprise.inject.spi.Extension
new file mode 100644
index 0000000..1be69b2
--- /dev/null
+++
b/core/runtime/src/main/resources/META-INF/services/javax.enterprise.inject.spi.Extension
@@ -0,0 +1 @@
+org.apache.isis.core.webapp.jee.IsisCDIBeanScanInterceptor
\ No newline at end of file
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