Java tutorial
/* * Copyright (c) 2006, WSO2 Inc. (http://www.wso2.org) All Rights Reserved. * * Licensed 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.wso2.carbon.mediator.bam; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.wso2.carbon.databridge.commons.Attribute; import org.wso2.carbon.databridge.commons.AttributeType; import org.wso2.carbon.databridge.commons.StreamDefinition; import org.wso2.carbon.databridge.commons.exception.MalformedStreamDefinitionException; import org.wso2.carbon.mediator.bam.config.BamMediatorException; import org.wso2.carbon.mediator.bam.config.stream.Property; import org.wso2.carbon.mediator.bam.config.stream.StreamConfiguration; import org.wso2.carbon.mediator.bam.config.stream.StreamEntry; import org.wso2.carbon.mediator.bam.util.BamMediatorConstants; import java.util.ArrayList; import java.util.List; /** * Builds the Stream Definition at the stream initialization */ public class StreamDefinitionBuilder { private StreamConfiguration streamConfiguration = null; private static Log log = LogFactory.getLog(StreamDefinitionBuilder.class); public StreamDefinition buildStreamDefinition(StreamConfiguration streamConfiguration) throws BamMediatorException { this.streamConfiguration = streamConfiguration; StreamDefinition streamDef; try { if (streamConfiguration != null) { streamDef = new StreamDefinition(this.streamConfiguration.getName(), this.streamConfiguration.getVersion()); streamDef.setNickName(this.streamConfiguration.getNickname()); streamDef.setDescription(this.streamConfiguration.getDescription()); streamDef.setCorrelationData(this.getCorrelationDataList()); streamDef.setMetaData(this.getMetaDataList()); streamDef.setPayloadData(this.getPayloadDataList()); return streamDef; } else { String errorMsg = "Stream Definition is null."; log.error(errorMsg); throw new BamMediatorException(errorMsg, new Exception()); } } catch (MalformedStreamDefinitionException e) { String errorMsg = "Malformed Stream Definition. " + e.getMessage(); log.error(errorMsg, e); throw new BamMediatorException(errorMsg, e); } catch (Exception e) { String errorMsg = "Error occurred while creating the Stream Definition. " + e.getMessage(); log.error(errorMsg, e); throw new BamMediatorException(errorMsg, e); } } private List<Attribute> getCorrelationDataList() throws BamMediatorException { try { List<Attribute> correlationDataAttributeList = new ArrayList<Attribute>(); correlationDataAttributeList .add(new Attribute(BamMediatorConstants.MSG_STR_ACTIVITY_ID, AttributeType.STRING)); return correlationDataAttributeList; } catch (Exception e) { String errorMsg = "Error occurred while getting the Correlation Data list. " + e.getMessage(); log.error(errorMsg, e); throw new BamMediatorException(errorMsg, e); } } private List<Attribute> getMetaDataList() throws BamMediatorException { List<Attribute> metaDataAttributeList = new ArrayList<Attribute>(); try { metaDataAttributeList.add(new Attribute(BamMediatorConstants.TENANT_ID, AttributeType.INT)); metaDataAttributeList.add(new Attribute(BamMediatorConstants.HTTP_METHOD, AttributeType.STRING)); metaDataAttributeList .add(new Attribute(BamMediatorConstants.CHARACTER_SET_ENCODING, AttributeType.STRING)); metaDataAttributeList.add(new Attribute(BamMediatorConstants.REMOTE_ADDRESS, AttributeType.STRING)); metaDataAttributeList.add(new Attribute(BamMediatorConstants.TRANSPORT_IN_URL, AttributeType.STRING)); metaDataAttributeList.add(new Attribute(BamMediatorConstants.MESSAGE_TYPE, AttributeType.STRING)); metaDataAttributeList.add(new Attribute(BamMediatorConstants.REMOTE_HOST, AttributeType.STRING)); metaDataAttributeList.add(new Attribute(BamMediatorConstants.SERVICE_PREFIX, AttributeType.STRING)); metaDataAttributeList.add(new Attribute(BamMediatorConstants.HOST, AttributeType.STRING)); return metaDataAttributeList; } catch (Exception e) { String errorMsg = "Error occurred while getting the Meta Data list. " + e.getMessage(); log.error(errorMsg, e); throw new BamMediatorException(errorMsg, e); } } private List<Attribute> getPayloadDataList() throws BamMediatorException { List<Attribute> payLoadDataAttributeList = new ArrayList<Attribute>(); try { this.addConstantPayloadToPayloadDataList(payLoadDataAttributeList); this.addPropertyPayloadToPayloadDataList(payLoadDataAttributeList); this.addEntityPayloadToPayloadDataList(payLoadDataAttributeList); return payLoadDataAttributeList; } catch (Exception e) { String errorMsg = "Error occurred while getting the Payload Data list. " + e.getMessage(); log.error(errorMsg, e); throw new BamMediatorException(errorMsg, e); } } private void addConstantPayloadToPayloadDataList(List<Attribute> attributes) throws BamMediatorException { try { attributes.add(new Attribute(BamMediatorConstants.MSG_DIRECTION, AttributeType.STRING)); attributes.add(new Attribute(BamMediatorConstants.OPERATION_NAME, AttributeType.STRING)); attributes.add(new Attribute(BamMediatorConstants.MSG_ID, AttributeType.STRING)); attributes.add(new Attribute(BamMediatorConstants.REQUEST_RECEIVED_TIME, AttributeType.LONG)); } catch (Exception e) { String errorMsg = "Error occurred while adding the Constant Fields to Payload Data list. " + e.getMessage(); log.error(errorMsg, e); throw new BamMediatorException(errorMsg, e); } } private void addPropertyPayloadToPayloadDataList(List<Attribute> attributes) throws BamMediatorException { try { List<Property> properties = this.streamConfiguration.getProperties(); if (properties != null) { for (Property property : properties) { if (property.getKey() != null && property.getType() != null) { attributes.add(new Attribute(property.getKey(), this.resolveTypes(property.getType()))); } } } } catch (NullPointerException e) { String errorMsg = "Undefined key or type in Stream Property. " + e.getMessage(); log.error(errorMsg, e); throw new BamMediatorException(errorMsg, e); } catch (Exception e) { String errorMsg = "Error occurred while adding the Property Fields to Payload Data list. " + e.getMessage(); log.error(errorMsg, e); throw new BamMediatorException(errorMsg, e); } } private void addEntityPayloadToPayloadDataList(List<Attribute> attributes) throws BamMediatorException { try { String entryName = ""; List<StreamEntry> streamEntries = this.streamConfiguration.getEntries(); if (streamEntries != null) { for (StreamEntry streamEntry : streamEntries) { if (streamEntry.getName() != null && streamEntry.getType() != null) { if ("SOAPBody".equals(streamEntry.getName())) { entryName = "soap_body"; } else if ("SOAPHeader".equals(streamEntry.getName())) { entryName = "soap_header"; } attributes.add(new Attribute(entryName, this.resolveTypes(streamEntry.getType()))); } } } } catch (NullPointerException e) { String errorMsg = "Undefined key or type in Stream Entry. " + e.getMessage(); log.error(errorMsg, e); throw new BamMediatorException(errorMsg, e); } catch (Exception e) { String errorMsg = "Error occurred while adding the Entity Fields to Payload Data list. " + e.getMessage(); log.error(errorMsg, e); throw new BamMediatorException(errorMsg, e); } } private AttributeType resolveTypes(String propertyType) throws BamMediatorException { try { if ("STRING".equals(propertyType)) { return AttributeType.STRING; } else if ("INTEGER".equals(propertyType)) { return AttributeType.INT; } else if ("FLOAT".equals(propertyType)) { return AttributeType.FLOAT; } else if ("DOUBLE".equals(propertyType)) { return AttributeType.DOUBLE; } else if ("BOOLEAN".equals(propertyType)) { return AttributeType.BOOL; } else if ("LONG".equals(propertyType)) { return AttributeType.LONG; } else { return AttributeType.STRING; } } catch (Exception e) { String errorMsg = "Error occurred while resolving types for Payload Data list. " + e.getMessage(); log.error(errorMsg, e); throw new BamMediatorException(errorMsg, e); } } }