| /* |
| * 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.felix.ipojo.handler.temporal; |
| |
| import org.apache.felix.ipojo.ConfigurationException; |
| import org.apache.felix.ipojo.PrimitiveHandler; |
| import org.apache.felix.ipojo.metadata.Element; |
| import org.apache.felix.ipojo.parser.FieldMetadata; |
| import org.apache.felix.ipojo.parser.MethodMetadata; |
| import org.apache.felix.ipojo.parser.PojoMetadata; |
| import org.apache.felix.ipojo.util.DependencyMetadataHelper; |
| import org.apache.felix.ipojo.util.DependencyModel; |
| import org.apache.felix.ipojo.util.DependencyStateListener; |
| import org.osgi.framework.Filter; |
| import org.osgi.framework.InvalidSyntaxException; |
| |
| import java.util.*; |
| |
| /** |
| * Temporal dependency handler. |
| * A temporal dependency waits (block) for the availability of the service. |
| * If no provider arrives in the specified among of time, a runtime exception is thrown. |
| * |
| * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a> |
| */ |
| public class TemporalHandler extends PrimitiveHandler implements DependencyStateListener { |
| |
| /** |
| * Default timeout if not specified. |
| */ |
| public static final int DEFAULT_TIMEOUT = 3000; |
| /** |
| * No policy. |
| */ |
| public static final int NO_POLICY = 0; |
| /** |
| * Uses a nullable object. |
| */ |
| public static final int NULLABLE = 1; |
| /** |
| * Uses a default-implementation object. |
| */ |
| public static final int DEFAULT_IMPLEMENTATION = 2; |
| /** |
| * Uses an empty array. |
| */ |
| public static final int EMPTY = 3; |
| /** |
| * Uses {@code null}. |
| */ |
| public static final int NULL = 4; |
| /** |
| * The handler namespace. |
| */ |
| public static final String NAMESPACE = "org.apache.felix.ipojo.handler.temporal"; |
| /** |
| * The list of managed dependencies. |
| */ |
| private List/*<deps>*/ m_dependencies = new ArrayList(1); |
| |
| /** |
| * Start method. Starts managed dependencies. |
| * |
| * @see org.apache.felix.ipojo.Handler#start() |
| */ |
| public void start() { |
| for (int i = 0; i < m_dependencies.size(); i++) { |
| ((TemporalDependency) m_dependencies.get(i)).start(); |
| } |
| } |
| |
| /** |
| * Stop method. Stops managed dependencies. |
| * |
| * @see org.apache.felix.ipojo.Handler#stop() |
| */ |
| public void stop() { |
| for (int i = 0; i < m_dependencies.size(); i++) { |
| ((TemporalDependency) m_dependencies.get(i)).stop(); |
| } |
| m_dependencies.clear(); |
| } |
| |
| /** |
| * Configure method. Creates managed dependencies. |
| * |
| * @param meta the component type metadata. |
| * @param dictionary the instance configuration. |
| * @throws ConfigurationException if the dependency is not configured correctly |
| * @see org.apache.felix.ipojo.Handler#configure(org.apache.felix.ipojo.metadata.Element, java.util.Dictionary) |
| */ |
| public void configure(Element meta, Dictionary dictionary) throws ConfigurationException { |
| PojoMetadata manipulation = getFactory().getPojoMetadata(); |
| Element[] deps = meta.getElements("requires", NAMESPACE); |
| |
| // Also check with temporal is no requires. |
| if (deps == null || deps.length == 0) { |
| deps = meta.getElements("temporal", NAMESPACE); |
| } |
| |
| // Get instance filters. |
| Dictionary filtersConfiguration = getRequiresFilters(dictionary.get("temporal.filters")); |
| if (filtersConfiguration == null || filtersConfiguration.isEmpty()) { |
| // Fall back on the Requires handler configuration, if any |
| filtersConfiguration = getRequiresFilters(dictionary.get("requires.filters")); |
| } |
| // Get from filters if any. |
| Dictionary fromConfiguration = getRequiresFilters(dictionary.get("temporal.from")); |
| if (fromConfiguration == null || fromConfiguration.isEmpty()) { |
| // Fall back on the Requires handler configuration, if any |
| fromConfiguration = getRequiresFilters(dictionary.get("requires.from")); |
| } |
| |
| |
| for (int i = 0; i < deps.length; i++) { |
| if (!deps[i].containsAttribute("field") || m_dependencies.contains(deps[i].getAttribute("field"))) { |
| error("One temporal dependency must be attached to a field or the field is already used"); |
| return; |
| } |
| String field = deps[i].getAttribute("field"); |
| |
| String id = field; |
| if (deps[i].containsAttribute("id")) { |
| id = deps[i].getAttribute("id"); |
| } |
| |
| FieldMetadata fieldmeta = manipulation.getField(field); |
| if (fieldmeta == null) { |
| error("The field " + field + " does not exist in the class " + getInstanceManager().getClassName()); |
| return; |
| } |
| |
| boolean agg = false; |
| boolean collection = false; |
| String spec = fieldmeta.getFieldType(); |
| if (spec.endsWith("[]")) { |
| agg = true; |
| spec = spec.substring(0, spec.length() - 2); |
| } else if (Collection.class.getName().equals(spec)) { |
| agg = true; |
| collection = true; |
| // Collection detected. Check for the specification attribute |
| spec = deps[i].getAttribute("specification"); |
| if (spec == null) { |
| error("A dependency injected inside a Collection must contain the 'specification' attribute"); |
| } |
| } |
| |
| // Determine the filter |
| String fil = deps[i].getAttribute("filter"); |
| // Override the filter if filter configuration if available in the instance configuration |
| if (filtersConfiguration != null && id != null && filtersConfiguration.get(id) != null) { |
| fil = (String) filtersConfiguration.get(id); |
| } |
| |
| // Check the from attribute |
| String from = deps[i].getAttribute("from"); |
| if (fromConfiguration != null && id != null && fromConfiguration.get(id) != null) { |
| from = (String) fromConfiguration.get(id); |
| } |
| |
| if (from != null) { |
| String fromFilter = "(|(instance.name=" + from + ")(service.pid=" + from + "))"; |
| if (agg) { |
| warn("The 'from' attribute is incompatible with aggregate requirements: only one provider will " + |
| "match : " + fromFilter); |
| } |
| if (fil != null) { |
| fil = "(&" + fromFilter + fil + ")"; // Append the two filters |
| } else { |
| fil = fromFilter; |
| } |
| } |
| |
| Filter filter = null; |
| if (fil != null) { |
| try { |
| filter = getInstanceManager().getContext().createFilter(fil); |
| } catch (InvalidSyntaxException e) { |
| throw new ConfigurationException("A requirement filter is invalid : " + filter, e); |
| } |
| } |
| |
| String prox = deps[i].getAttribute("proxy"); |
| // Use proxy by default except for array: |
| boolean proxy = prox == null || prox.equals("true"); |
| |
| if (prox == null && proxy) { // Proxy set because of the default. |
| if (agg && !collection) { // Aggregate and array |
| proxy = false; |
| } |
| } |
| |
| if (proxy && agg) { |
| if (!collection) { |
| error("Proxied aggregate temporal dependencies cannot be an array. Only collections are supported"); |
| } |
| } |
| |
| long timeout = DEFAULT_TIMEOUT; |
| if (deps[i].containsAttribute("timeout")) { |
| String to = deps[i].getAttribute("timeout"); |
| if (to.equalsIgnoreCase("infinite") || to.equalsIgnoreCase("-1")) { |
| timeout = Long.MAX_VALUE; // Infinite wait time ... |
| } else { |
| timeout = new Long(deps[i].getAttribute("timeout")).longValue(); |
| } |
| } |
| |
| int policy = NO_POLICY; |
| String di = null; |
| String onTimeout = deps[i].getAttribute("onTimeout"); |
| if (onTimeout != null) { |
| if (onTimeout.equalsIgnoreCase("nullable")) { |
| policy = NULLABLE; |
| } else if (onTimeout.equalsIgnoreCase("empty-array") || onTimeout.equalsIgnoreCase("empty")) { |
| policy = EMPTY; |
| if (!agg) { |
| // The empty array policy can only be used on aggregate dependencies |
| error("Cannot use the empty array policy for " + field + " : non aggregate dependency."); |
| } |
| } else if (onTimeout.equalsIgnoreCase("null")) { |
| policy = NULL; |
| } else if (onTimeout.length() > 0) { |
| di = onTimeout; |
| policy = DEFAULT_IMPLEMENTATION; |
| } |
| } |
| |
| Class specification = DependencyMetadataHelper.loadSpecification(spec, getInstanceManager().getContext()); |
| TemporalDependency dep = new TemporalDependency(specification, agg, collection, proxy, filter, getInstanceManager().getContext(), timeout, policy, di, this); |
| m_dependencies.add(dep); |
| |
| if (!proxy) { // Register method interceptor only if are not a proxy |
| MethodMetadata[] methods = manipulation.getMethods(); |
| for (int k = 0; k < methods.length; k++) { |
| getInstanceManager().register(methods[k], dep); |
| } |
| } |
| |
| getInstanceManager().register(fieldmeta, dep); |
| } |
| } |
| |
| /** |
| * Gets the requires filter configuration from the given object. |
| * The given object must come from the instance configuration. |
| * This method was made to fix FELIX-2688. It supports filter configuration using |
| * an array: |
| * <code>{"myFirstDep", "(property1=value1)", "mySecondDep", "(property2=value2)"});</code> |
| * <p/> |
| * Copied from DependencyHandler#getRequiresFilters(Object) |
| * |
| * @param requiresFiltersValue the value contained in the instance |
| * configuration. |
| * @return the dictionary. If the object in already a dictionary, just returns it, |
| * if it's an array, builds the dictionary. |
| * @throws ConfigurationException the dictionary cannot be built |
| */ |
| private Dictionary getRequiresFilters(Object requiresFiltersValue) |
| throws ConfigurationException { |
| if (requiresFiltersValue != null |
| && requiresFiltersValue.getClass().isArray()) { |
| String[] filtersArray = (String[]) requiresFiltersValue; |
| if (filtersArray.length % 2 != 0) { |
| throw new ConfigurationException( |
| "A requirement filter is invalid : " |
| + requiresFiltersValue); |
| } |
| Dictionary requiresFilters = new Hashtable(); |
| for (int i = 0; i < filtersArray.length; i += 2) { |
| requiresFilters.put(filtersArray[i], filtersArray[i + 1]); |
| } |
| return requiresFilters; |
| } |
| |
| return (Dictionary) requiresFiltersValue; |
| } |
| |
| /** |
| * Nothing to do. |
| * A temporal dependency is always valid. |
| * |
| * @param dependencymodel dependency. |
| * @see org.apache.felix.ipojo.util.DependencyStateListener#invalidate(org.apache.felix.ipojo.util.DependencyModel) |
| */ |
| public void invalidate(DependencyModel dependencymodel) { |
| } |
| |
| /** |
| * Nothing to do. |
| * A temporal dependency is always valid. |
| * |
| * @param dependencymodel dependency. |
| * @see org.apache.felix.ipojo.util.DependencyStateListener#validate(org.apache.felix.ipojo.util.DependencyModel) |
| */ |
| public void validate(DependencyModel dependencymodel) { |
| } |
| |
| |
| } |