--- /dev/null
+package org.argeo.slc.core.execution.generator;
+
+import java.util.HashMap;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.argeo.slc.SlcException;
+import org.springframework.aop.scope.ScopedProxyUtils;
+import org.springframework.beans.BeansException;
+import org.springframework.beans.MutablePropertyValues;
+import org.springframework.beans.factory.config.BeanDefinitionHolder;
+import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
+import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
+import org.springframework.beans.factory.config.RuntimeBeanReference;
+import org.springframework.beans.factory.support.BeanDefinitionRegistry;
+import org.springframework.beans.factory.support.GenericBeanDefinition;
+import org.springframework.core.Ordered;
+
+/**
+ * Generates <code>ExecutionFlows</code> and <code>Runnables</code> as
+ * beans in the Spring Application Context.
+ * Called by the Application Context as a <code>BeanFactoryPostProcessor</code>.
+ * Two kinds of beans are generated:
+ * <code>RunnableCallFlow</code>, calling a list of <code>Runnables</code> from the
+ * Application Context after configuring the <code>ExecutionContext</code>,
+ * and outputs of a <code>RunnableFactory</code>.
+ */
+public class ExecutionFlowGenerator implements BeanFactoryPostProcessor,
+ Ordered {
+
+ private final Log log = LogFactory.getLog(getClass());
+
+ /**
+ * Source providing a list of <code>RunnableCallFlowDescriptor</code>
+ * used to create <code>RunnableCallFlow</code> and a list of
+ * <code>RunnableDataNode</code> used to create any kind of flow via a factory
+ */
+ protected ExecutionFlowGeneratorSource source;
+
+ /**
+ * Factory used to create Runnables in the Application context from
+ * the <code>RunnableDataNode</code> provided from the source.
+ */
+ protected RunnableFactory runnableFactory;
+
+ /**
+ * Bean name of the <code>ExecutionContext</code>.
+ * Used to provide the created <code>RunnableCallFlow</code> beans
+ * with a <code>RuntimeBeanReference</code> to
+ * the <code>ExecutionContext</code>
+ */
+ private String executionContextBeanName = "executionContext";
+
+ /**
+ * Bean name of the context values Map.
+ * A bean of class HashMap is created with this name, and a
+ * <code>RuntimeBeanReference</code> is provided to the created
+ * <code>RunnableCallFlow</code> beans.
+ */
+ private String contextValuesBeanName = "executionFlowGenerator.contextValues";
+
+ /**
+ * Prefix added to the bean names defined in each
+ * <code>RunnableCallFlowDescriptor</code>
+ */
+ private String flowBeanNamesPrefix = "";
+
+ private int order = Ordered.HIGHEST_PRECEDENCE;
+
+ public void postProcessBeanFactory(
+ ConfigurableListableBeanFactory beanFactory) throws BeansException {
+
+ // assert that the beanFactory is a BeanDefinitionRegistry
+ if (!(beanFactory instanceof BeanDefinitionRegistry)) {
+ throw new SlcException("Can only work on "
+ + BeanDefinitionRegistry.class);
+ }
+
+ // add bean for the Context Values Map
+ createAndRegisterContextValuesBean((BeanDefinitionRegistry) beanFactory);
+
+ // add beans for each RunnableDataNode
+ for(RunnableDataNode node : source.getRunnableDataNodes()) {
+ runnableFactory.createAndRegisterRunnable(node, (BeanDefinitionRegistry) beanFactory);
+ }
+
+ // add beans for each RunnableCallFlowDescriptor of the source to the application context
+ for (RunnableCallFlowDescriptor descriptor : source
+ .getRunnableCallFlowDescriptors()) {
+ createAndRegisterFlowFor(descriptor, (BeanDefinitionRegistry) beanFactory);
+ }
+ }
+
+ /**
+ * Creates a <code>RunnableCallFlow</code> bean
+ * for a <code>RunnableCallFlowDescriptor</code> and registers
+ * it in the <code>BeanDefinitionRegistry</code>
+ * @param flowDescriptor
+ * @param registry
+ */
+ private void createAndRegisterFlowFor(RunnableCallFlowDescriptor flowDescriptor, BeanDefinitionRegistry registry) {
+ // create the flow bean
+ GenericBeanDefinition flowBean = new GenericBeanDefinition();
+ flowBean.setBeanClass(RunnableCallFlow.class);
+
+ String beanName = flowBeanNamesPrefix + flowDescriptor.getBeanName();
+
+ MutablePropertyValues mpv = new MutablePropertyValues();
+ mpv.addPropertyValue("runnableCalls", flowDescriptor.getRunnableCalls());
+ mpv.addPropertyValue("sharedContextValuesMap", new RuntimeBeanReference(contextValuesBeanName));
+
+ mpv.addPropertyValue("name", beanName);
+ mpv.addPropertyValue("path", flowDescriptor.getPath());
+
+ mpv.addPropertyValue("executionContext", new RuntimeBeanReference(executionContextBeanName));
+
+ flowBean.setPropertyValues(mpv);
+
+ // register it
+ if(log.isDebugEnabled()) {
+ log.debug("Registering bean definition for RunnableCallFlow " + beanName);
+ }
+ registry.registerBeanDefinition(beanName, flowBean);
+ }
+
+ /**
+ * Creates the Context Values bean and register it in the
+ * <code>BeanDefinitionRegistry</code>
+ * @param registry
+ */
+ private void createAndRegisterContextValuesBean(BeanDefinitionRegistry registry) {
+ GenericBeanDefinition contextValuesBean = new GenericBeanDefinition();
+ contextValuesBean.setBeanClass(HashMap.class);
+
+ BeanDefinitionHolder bdh = ScopedProxyUtils.createScopedProxy(new BeanDefinitionHolder(contextValuesBean, contextValuesBeanName), registry, true);
+ registry.registerBeanDefinition(contextValuesBeanName, bdh.getBeanDefinition());
+ }
+
+ public int getOrder() {
+ return order;
+ }
+
+ public void setOrder(int order) {
+ this.order = order;
+ }
+
+ public void setSource(ExecutionFlowGeneratorSource source) {
+ this.source = source;
+ }
+
+ public void setRunnableFactory(RunnableFactory runnableFactory) {
+ this.runnableFactory = runnableFactory;
+ }
+
+ public void setExecutionContextBeanName(String executionContextBeanName) {
+ this.executionContextBeanName = executionContextBeanName;
+ }
+
+ public void setContextValuesBeanName(String contextValuesBeanName) {
+ this.contextValuesBeanName = contextValuesBeanName;
+ }
+
+ public void setFlowBeanNamesPrefix(String flowBeanNamesPrefix) {
+ this.flowBeanNamesPrefix = flowBeanNamesPrefix;
+ }
+}
projects / gpl / argeo-slc.git / blobdiff