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Merge pull request #2086 from chanikag/autoMode
Introduce sequence observers
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40 changes: 40 additions & 0 deletions
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modules/core/src/main/java/org/apache/synapse/SequenceFlowObserver.java
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| /** | ||
| * Copyright (c) 2023, WSO2 LLC. (http://www.wso2.org) All Rights Reserved. | ||
| * | ||
| * WSO2 LLC. 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. | ||
| */ | ||
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| package org.apache.synapse; | ||
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| public interface SequenceFlowObserver { | ||
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| /** | ||
| * Set the observer name | ||
| * | ||
| * @param name handler name | ||
| */ | ||
| void setName(String name); | ||
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| /** | ||
| * This method should implement the logic to run at the start of the flow | ||
| */ | ||
| void start(MessageContext synCtx, String seqName); | ||
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| /** | ||
| * This method should implement the logic to run at the end of the flow | ||
| */ | ||
| void complete(MessageContext synCtx, String seqName); | ||
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| } |
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modules/core/src/main/java/org/apache/synapse/config/SequenceFlowObserversLoader.java
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| /** | ||
| * Copyright (c) 2023, WSO2 LLC. (http://www.wso2.org) All Rights Reserved. | ||
| * | ||
| * WSO2 LLC. 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. | ||
| */ | ||
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| package org.apache.synapse.config; | ||
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| import org.apache.axiom.om.OMElement; | ||
| import org.apache.commons.lang.StringUtils; | ||
| import org.apache.commons.logging.Log; | ||
| import org.apache.commons.logging.LogFactory; | ||
| import org.apache.synapse.SequenceFlowObserver; | ||
| import org.apache.synapse.SynapseConstants; | ||
| import org.apache.synapse.SynapseException; | ||
| import org.apache.synapse.commons.util.MiscellaneousUtil; | ||
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| import javax.xml.namespace.QName; | ||
| import java.util.ArrayList; | ||
| import java.util.Iterator; | ||
| import java.util.List; | ||
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| public class SequenceFlowObserversLoader { | ||
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| private static final QName ROOT_Q = new QName("observers"); | ||
| private static final QName OBSERVER_Q = new QName("observer"); | ||
| private static final QName CLASS_Q = new QName("class"); | ||
| private static final QName NAME_ATT = new QName("name"); | ||
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| private static Log log = LogFactory.getLog(SequenceFlowObserversLoader.class); | ||
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| public static List<SequenceFlowObserver> loadObservers() { | ||
| List<SequenceFlowObserver> observers = new ArrayList<>(); | ||
| OMElement observersConfig = | ||
| MiscellaneousUtil.loadXMLConfig(SynapseConstants.SEQUENCE_OBSERVERS_FILE); | ||
| if (observersConfig != null) { | ||
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| if (!ROOT_Q.equals(observersConfig.getQName())) { | ||
| handleException("Invalid sequence observer configuration file"); | ||
| } | ||
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| Iterator iterator = observersConfig.getChildrenWithName(OBSERVER_Q); | ||
| while (iterator.hasNext()) { | ||
| OMElement observerElem = (OMElement) iterator.next(); | ||
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| String name = null; | ||
| if (observerElem.getAttribute(NAME_ATT) != null) { | ||
| name = observerElem.getAttributeValue(NAME_ATT); | ||
| } else { | ||
| handleException("Name not defined in one or more sequence observer"); | ||
| } | ||
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| if (observerElem.getAttribute(CLASS_Q) != null) { | ||
| String className = observerElem.getAttributeValue(CLASS_Q); | ||
| if (StringUtils.isNotBlank(className)) { | ||
| SequenceFlowObserver observer = createObserver(className); | ||
| if (observer != null) { | ||
| observers.add(observer); | ||
| observer.setName(name); | ||
| } | ||
| } else { | ||
| handleException("Class name is null for sequence observer name : " + name); | ||
| } | ||
| } else { | ||
| handleException("Class name not defined for sequence observer named : " + name); | ||
| } | ||
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| } | ||
| } | ||
| return observers; | ||
| } | ||
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| private static SequenceFlowObserver createObserver(String classFQName) { | ||
| Object obj = null; | ||
| try { | ||
| obj = Class.forName(classFQName).newInstance(); | ||
| } catch (ClassNotFoundException | InstantiationException | IllegalAccessException e) { | ||
| handleException("Error creating Sequence observer for class name : " + classFQName, e); | ||
| } | ||
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| if (obj instanceof SequenceFlowObserver) { | ||
| return (SequenceFlowObserver) obj; | ||
| } else { | ||
| handleException("Error creating Sequence observer. The Sequence observer should be of type " + | ||
| "org.apache.synapse.SequenceFlowObserver"); | ||
| } | ||
| return null; | ||
| } | ||
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| private static void handleException(String msg) { | ||
| log.error(msg); | ||
| throw new SynapseException(msg); | ||
| } | ||
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| private static void handleException(String msg, Exception ex) { | ||
| log.error(msg, ex); | ||
| throw new SynapseException(msg, ex); | ||
| } | ||
| } |
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