Talend tJMSInput在bundle:restart后会存在两个Consumer的解决方法

问题：在使用tJMSInput监听Topic/Queue，但用OSGI的形式部署到container中后，如果使用bundle:restart命令重启的话，会发现在JMS服务里面有两个Consumer！

解决方法：因本人使用的是TIBCO EMS，需要引入相关jar，故我重新定义了一个组件来简化输入以及解决bundle:restart的问题。

因为造成存在两个Consumer的原因是因为在Bundle:restart时没有关闭之前的连接而已！所以我们需要修改组件中的代码，用try{}catche(){}finally{}的方式，在finally里面关闭相关连接！

下面列出我自定义TIBCO EMS调用并关闭连接的组件代码：

tEsquelEMSInput_begin.javajet：

<%@ jet 
imports="
    org.talend.core.model.process.INode 
    org.talend.core.model.process.ElementParameterParser 
    org.talend.core.model.metadata.IMetadataTable 
    org.talend.core.model.metadata.IMetadataColumn 
    org.talend.core.model.process.IConnection
    org.talend.designer.codegen.config.CodeGeneratorArgument
    org.talend.core.model.process.IConnectionCategory
    java.util.List
    java.util.Map
" 
%>
<%@ include file="@{org.talend.designer.components.localprovider}/components/templates/Log4j/LogUtil.javajet"%>
<%

CodeGeneratorArgument codeGenArgument = (CodeGeneratorArgument) argument;
INode node = (INode)codeGenArgument.getArgument();
String cid = node.getUniqueName();
log = new LogUtil(node);
String contextProvider="com.tibco.tibjms.naming.TibjmsInitialContextFactory";
String connFacName="ConnectionFactory";
String url=ElementParameterParser.getValue(node, "__SERVER_URL__");
String user=ElementParameterParser.getValue(node, "__USER__");

String from=ElementParameterParser.getValue(node, "__FROM__");
String timeout=ElementParameterParser.getValue(node, "__TIMEOUT__");
String messageSelector=ElementParameterParser.getValue(node, "__MSG_SELECTOR__");
String processingMode = ElementParameterParser.getValue(node, "__PROCESSING_MODE__");
String msgType = ElementParameterParser.getValue(node, "__MSGTYPE__");

List<Map<String, String>> advProps = (List<Map<String,String>>)ElementParameterParser.getObjectValue(node, "__ADVANCED_PROPERTIES__");

boolean enableSubscription = "Topic".equals(msgType) && "true".equalsIgnoreCase(ElementParameterParser.getValue(node, "__ENABLE_SUB__"));
String clientID = ElementParameterParser.getValue(node, "__CLIENT_ID__");
String subscriberName = ElementParameterParser.getValue(node, "__SUBSCRIBER_NAME__");

IMetadataTable metadata=null;
List<IMetadataTable> metadatas = node.getMetadataList();
if ((metadatas!=null)&&(metadatas.size()>0)) {
    metadata = metadatas.get(0);
}
%>

    java.util.Hashtable props_<%=cid%> = new java.util.Hashtable();
    props_<%=cid%>.put(javax.naming.Context.INITIAL_CONTEXT_FACTORY, "<%=contextProvider%>");
    props_<%=cid%>.put(javax.naming.Context.PROVIDER_URL, <%=url%>);
    
<%
if(advProps.size() > 0){
    for(Map<String, String> item : advProps){
%>
    props_<%=cid%>.put(<%=item.get("PROPERTY") %>, <%=item.get("VALUE") %>);
<% 
    } 
}
%>
javax.jms.Connection connection_<%=cid%> = null;
javax.jms.Session session_<%=cid%> = null;
javax.jms.MessageConsumer consumer_<%=cid%> = null;
int nbline_<%=cid %> = 0;
try {
    javax.naming.Context context_<%=cid%> = new javax.naming.InitialContext(props_<%=cid%>);
    javax.jms.ConnectionFactory factory_<%=cid%> = (javax.jms.ConnectionFactory) context_<%=cid%>.lookup("<%=connFacName%>");
    
    <%
    String passwordFieldName = "__PASS__";
    %>
        
    <%@ include file="@{org.talend.designer.components.localprovider}/components/templates/password.javajet"%>

    connection_<%=cid%> = factory_<%=cid%>.createConnection(<%=user %>, decryptedPassword_<%=cid%>);
    
    <%
    if(enableSubscription && clientID != null && clientID.length() > 0){
    %>
    connection_<%=cid%>.setClientID(<%=clientID%>);
    <%
    }
    %>
    
    session_<%=cid%> = connection_<%=cid%>.createSession(false, javax.jms.Session.CLIENT_ACKNOWLEDGE);
    javax.jms.Destination dest_<%=cid%> = session_<%=cid%>.create<%=msgType%>(<%=from %>);

    <%
    if(enableSubscription){
    %>
    consumer_<%=cid%> = session_<%=cid%>.createDurableSubscriber((javax.jms.Topic)dest_<%=cid%>,<%=subscriberName%>,<%=messageSelector%>,false);
    <%
    } else {
    %>
    consumer_<%=cid%>    = session_<%=cid%>.createConsumer(dest_<%=cid%>, <%=messageSelector%>);
    <%
    }
    %>
    
    connection_<%=cid%>.start();

    System.out.println("Ready to receive message");
    System.out.println("Waiting...");
    <%log.info(log.str("Ready to receive message."));%>
    <%log.info(log.str("Waiting..."));%>

    javax.jms.Message message_<%=cid%>;    

    while ((message_<%=cid%> = consumer_<%=cid%>.receive(<%="-1".equals(timeout)?0:timeout%>*1000)) != null) {
        <%log.debug(log.str("Retrieving the message "), "(nbline_" + cid + "+1)", log.str("."));%>
<%
    List< ? extends IConnection> conns = node.getOutgoingSortedConnections();
    List<IMetadataColumn> columnLists = metadata.getListColumns();
    for(IConnection conn:conns){
        if (conn.getLineStyle().hasConnectionCategory(IConnectionCategory.DATA)) {
            String firstConnName = conn.getName();
            if("RAW".equals(processingMode)){
%>
        <%=firstConnName%>.message=message_<%=cid %>;    
<%
            }else{
                if("id_Document".equals(metadata.getColumn("messageContent").getTalendType())){
%>
        <%=firstConnName%>.messageContent=ParserUtils.parseTo_Document(((javax.jms.ObjectMessage) message_<%=cid %>).getObject().toString());
<%
                }else{
%>
        <%=firstConnName%>.messageContent=((javax.jms.TextMessage) message_<%=cid %>).getText();
<%
                }
            }
        }
    }
    

%>


        

tEsquelEMSInput_end.javajet：

<%@ jet 
    imports="
        org.talend.core.model.process.INode 
        org.talend.designer.codegen.config.CodeGeneratorArgument
        org.talend.core.model.process.ElementParameterParser
    " 
%>
<%@ include file="@{org.talend.designer.components.localprovider}/components/templates/Log4j/LogUtil.javajet"%>
<%
CodeGeneratorArgument codeGenArgument = (CodeGeneratorArgument) argument;
INode node = (INode)codeGenArgument.getArgument();
String cid = node.getUniqueName();
log = new LogUtil(node);
String timeout=ElementParameterParser.getValue(node, "__TIMEOUT__");
String maxMsg=ElementParameterParser.getValue(node, "__MAX_MSG__");
%>
    nbline_<%=cid %>++;
    message_<%=cid%>.acknowledge();
    if(<%=maxMsg %> > 0 && nbline_<%=cid %> >= <%=maxMsg %>){
        break;
    }
    
}
} catch(Exception error){
   throw error;
} finally {
  if(consumer_<%=cid%> != null){
    consumer_<%=cid%>.close();
  }
  if(session_<%=cid%> != null){
    session_<%=cid%>.close();
  }
  if(connection_<%=cid%> != null){
    connection_<%=cid%>.close();
  }
}
<%log.info(log.str("Retrieved records count: "), log.var("nbline"), log.str("."));%>
globalMap.put("<%=cid %>_NB_LINE", nbline_<%=cid%>);

tEsquelEMSInput_java.xml：

<?xml version="1.0" encoding="UTF-8"?>

<COMPONENT>
    <HEADER PLATEFORM="ALL" SERIAL="" VERSION="0.102" STATUS="ALPHA"
        COMPATIBILITY="ALL" AUTHOR="AngusYang" RELEASE_DATE="20170220A"
        STARTABLE="true" LOG4J_ENABLED="true">
        <SIGNATURE />
    </HEADER>
    <FAMILIES>
        <FAMILY>Esquel</FAMILY>
    </FAMILIES>
    <DOCUMENTATION>
        <URL />
    </DOCUMENTATION>
    <CONNECTORS>
        <CONNECTOR CTYPE="FLOW" MAX_INPUT="0" MAX_OUTPUT="1" />
        <CONNECTOR CTYPE="ITERATE" MAX_OUTPUT="1" MAX_INPUT="1" />
        <CONNECTOR CTYPE="SUBJOB_OK" MAX_INPUT="1" MAX_OUTPUT="1" />
        <CONNECTOR CTYPE="COMPONENT_OK" />
        <CONNECTOR CTYPE="COMPONENT_ERROR" />
        <CONNECTOR CTYPE="RUN_IF" />
    </CONNECTORS>
    <PARAMETERS>
        <PARAMETER NAME="SERVER_URL" FIELD="TEXT" NUM_ROW="1">
            <DEFAULT>"tibjmsnaming://localhost:7222"</DEFAULT>
        </PARAMETER>
        <PARAMETER NAME="USER" FIELD="TEXT" NUM_ROW="5" REQUIRED="true">
            <DEFAULT>"admin"</DEFAULT>
        </PARAMETER>
        <PARAMETER NAME="PASS" FIELD="PASSWORD" NUM_ROW="5" REQUIRED="true">
            <DEFAULT>""</DEFAULT>
        </PARAMETER>

        <!-- Durable subscription start -->
        <PARAMETER NAME="ENABLE_SUB" FIELD="CHECK" SHOW_IF="MSGTYPE == 'TOPIC'"
            NUM_ROW="10">
            <DEFAULT>false</DEFAULT>
        </PARAMETER>

        <PARAMETER NAME="CLIENT_ID" FIELD="TEXT" NUM_ROW="15"
            REQUIRED="false" SHOW_IF="(MSGTYPE == 'TOPIC') AND (ENABLE_SUB == 'true')">
            <DEFAULT>""</DEFAULT>
        </PARAMETER>

        <PARAMETER NAME="SUBSCRIBER_NAME" FIELD="TEXT" NUM_ROW="20"
            REQUIRED="true" SHOW_IF="(MSGTYPE == 'TOPIC') AND (ENABLE_SUB == 'true')">
            <DEFAULT>""</DEFAULT>
        </PARAMETER>
        <!-- Durable subscription end -->

        <PARAMETER NAME="MSGTYPE" FIELD="CLOSED_LIST" NUM_ROW="25">
            <ITEMS DEFAULT="TOPIC">
                <ITEM NAME="TOPIC" VALUE="Topic" />
                <ITEM NAME="QUEUE" VALUE="Queue" />
            </ITEMS>
        </PARAMETER>
        <PARAMETER NAME="FROM" FIELD="TEXT" SHOW="true" NUM_ROW="30">
            <DEFAULT>""</DEFAULT>
        </PARAMETER>
        <PARAMETER NAME="TIMEOUT" FIELD="TEXT" SHOW="true" NUM_ROW="33">
            <DEFAULT>-1</DEFAULT>
        </PARAMETER>
        <PARAMETER NAME="MAX_MSG" FIELD="TEXT" SHOW="true" NUM_ROW="33">
            <DEFAULT>-1</DEFAULT>
        </PARAMETER>
        <PARAMETER NAME="MSG_SELECTOR" FIELD="TEXT" NUM_ROW="35"
            REQUIRED="true">
            <DEFAULT>""</DEFAULT>
        </PARAMETER>
        <PARAMETER NAME="PROCESSING_MODE" FIELD="CLOSED_LIST" SHOW="true"
            NUM_ROW="40">
            <ITEMS DEFAULT="RAW">
                <ITEM NAME="RAW" VALUE="RAW" />
                <ITEM NAME="CONTENT" VALUE="CONTENT" />
            </ITEMS>
        </PARAMETER>
        <PARAMETER NAME="SCHEMA" FIELD="SCHEMA_TYPE" REQUIRED="true"
            NUM_ROW="40">
            <TABLE IF="PROCESSING_MODE == 'RAW'" READONLY="true">
                <COLUMN NAME="message" TYPE="id_Object" />
            </TABLE>
            <TABLE IF="PROCESSING_MODE == 'CONTENT'" READONLY="false">
                <COLUMN NAME="messageContent" TYPE="id_String" CUSTOM="true" />
            </TABLE>
        </PARAMETER>
    </PARAMETERS>

    <ADVANCED_PARAMETERS>
        <PARAMETER NAME="ADVANCED_PROPERTIES" FIELD="TABLE"
            REQUIRED="false" NUM_ROW="10" NB_LINES="3">
            <ITEMS>
                <ITEM NAME="PROPERTY" />
                <ITEM NAME="VALUE" />
            </ITEMS>
        </PARAMETER>
    </ADVANCED_PARAMETERS>
    <CODEGENERATION>
        <IMPORTS>
            <IMPORT MODULE="jms-2.0.jar" NAME="jms-2.0" REQUIRED="true" />
            <IMPORT MODULE="tibcrypt.jar" NAME="tibcrypt" REQUIRED="true" />
            <IMPORT MODULE="tibjms.jar" NAME="tibjms" REQUIRED="true" />
        </IMPORTS>
    </CODEGENERATION>
    <RETURNS>
        <RETURN AVAILABILITY="AFTER" NAME="NB_LINE" TYPE="id_Integer" />
    </RETURNS>
</COMPONENT>

tEsquelEMSInput_messages.properties：

#
#Mon Jun 22 21:50:39 CST 2009
HELP=org.talend.help.tEsquelEMSInput
SERVER_URL.NAME=Server URL
TIMEOUT.NAME=Timeout for Next Message(in sec)
MSGTYPE.NAME=Message Type
FROM.NAME=Message From
NAME=tEsquelEMSInput
MAX_MSG.NAME=Maximum Messages
SERVER.NAME=MQ Server
SERVER.ITEM.TIBCO=Tibco EMS
NB_LINE.NAME=Number of line
SCHEMA.NAME=Schema
LONG_NAME=Esquel TIBCO EMS Receive Message
MSG_SELECTOR.NAME=Message Selector Expression
USER.NAME=User Name
PASS.NAME=Password
PROCESSING_MODE.NAME=Processing Mode
PROCESSING_MODE.ITEM.RAW=Raw Message
PROCESSING_MODE.ITEM.CONTENT=Message Content
MSGTYPE.ITEM.QUEUE=Queue
MSGTYPE.ITEM.TOPIC=Topic
MSGTYPE.NAME=Message Type

ADVANCED_PROPERTIES.NAME=Properties 
ADVANCED_PROPERTIES.ITEM.PROPERTY=Property
ADVANCED_PROPERTIES.ITEM.VALUE=Value

ENABLE_SUB.NAME=Enable Durable Subscription
CLIENT_ID.NAME=ClientID
SUBSCRIBER_NAME.NAME=Subscriber Name