The provided code is part of a Java method, likely...

December 30, 2024 at 07:26 AM

String EMS_OUT_QRY_ORDERBY = "order by MEDIA_PRIORITY, MSG_PRIORITY";
    this.logreq = !(p_logReq != null && p_logReq.equalsIgnoreCase("N"));
    this.userId = "Scheduler_" + jobName;
    ApplicationLog.getInstance().setDebug(this.userId, this.logreq);
    dbg("getEMSOutMsgs-->inside getEMSOutMsgs Job");
    int curProcessStat = 0;
    int processCnt = 0;
    int paramBlockSize = 100;
    StringBuffer emsQryBuf = new StringBuffer(emsOutQuery);
    StringBuffer emsQryLckBuf = new StringBuffer(emsOutQueryLck);
    PreparedStatement pstmt = null;
    PreparedStatement pstmtLock = null;
    PreparedStatement updPstmt = null;
    String whereCond = "";
    this.emsOutMsgs = new ArrayList();
    dbg("getEMSOutMsgs-->before Where class");
    if (params != null) {
      String blkSize = (String)params.get("BLOCK_SIZE");
      whereCond = (String)params.get("WHERE_CLAUSE");
      if (whereCond != "" && whereCond != null && !"null".equals(whereCond)) {
        if (this.dlyMsgOutCols == null || this.dlyMsgOutCols.isEmpty()) {
          ResultSet dlyMsgOutColRS = null;
          PreparedStatement dlyMsgColPstmt = null;
          try {
            dbg("getEMSOutMsgs-->Getting DB Connection,executing dlyMsgOutColumQry");
            ds = FCServiceLocator.getInstance().getDataSource(jndiName);
            conn = ds.getConnection();
            dlyMsgColPstmt = conn.prepareStatement(dlyMsgOutColumQry);
            dlyMsgOutColRS = dlyMsgColPstmt.executeQuery();
            this.dlyMsgOutCols = new HashSet<>();
            while (dlyMsgOutColRS.next())
              this.dlyMsgOutCols.add(dlyMsgOutColRS.getString(1)); 
          } catch (SQLException e) {
            dbg("SQLException :" + e.getMessage());
          } finally {
            try {
              if (dlyMsgOutColRS != null)
                dlyMsgOutColRS.close(); 
            } catch (SQLException sQLException) {}
            try {
              if (dlyMsgColPstmt != null)
                dlyMsgColPstmt.close(); 
            } catch (SQLException sQLException) {}
            try {
              if (conn != null)
                conn.close(); 
            } catch (SQLException sQLException) {}
          } 
        } 
        whereCond = " and " + whereCond;
        emsQryBuf.append(alterEmsOutQryWhereClause(whereCond));
        emsQryLckBuf.append(whereCond);
      } 
      try {
        if (blkSize != null && !"null".equals(blkSize))
          paramBlockSize = Integer.parseInt(blkSize); 
      } catch (Exception exp) {
        dbg("getEMSOutMsgs-->could not get block size");
        ApplicationLog.getInstance().writeException(this.userId, exp);
      } 
      paramNode = (String)params.get("NODE");
      paramNode = (paramNode == null) ? "" : paramNode;
      paramMcs = (String)params.get("MCS");
      String str1 = paramMcs = (paramMcs == null) ? "" : paramMcs;
    } 
    if (whereCond == null)
      whereCond = "Not Maintained"; 
    dbg("getEMSOutMsgs-->whereCond is " + whereCond);
    dbg("getEMSOutMsgs-->paramBlockSize is " + paramBlockSize);
    dbg("getEMSOutMsgs-->Job Name is " + jobName);
    try {
      emsQryBuf.append(EMS_OUT_QRY_ORDERBY);
      emsQryLckBuf.append(" ORDER BY PRIORITY FOR UPDATE NOWAIT");
      dbg("getEMSOutMsgs-->Getting DB Connection");
      ds = FCServiceLocator.getInstance().getDataSource(jndiName);
      conn = ds.getConnection();
      pstmt = conn.prepareStatement(emsQryBuf.toString());
      if (sModuleGroup.equalsIgnoreCase("FCPMTS")) {
    	// Set utilDate to the current date
    	    Date utilDate = new Date(System.currentTimeMillis());
    	    dbg("getEMSOutMsgs-->Current Date is " + utilDate);
    	    
    	  //Date utilDate = new java.sql.Date(System.currentTimeMillis());
        //..Date utilDate = new Date();
    	 
         Date date = new Date(utilDate.getTime());
      }

The provided code is part of a Java method, likely responsible for retrieving and processing "EMS Out Messages" from a database. Here's a detailed explanation of what this code does:

Initial Variable Setup:
- EMS_OUT_QRY_ORDERBY: Defines an SQL clause to order results by MEDIA_PRIORITY and MSG_PRIORITY.
- Logging (logreq): Determines if logging is enabled (true) or disabled (false) based on the value of p_logReq.
- userId: Constructs a user ID string using the jobName.
- Sets debug logging and initializes counters for processing.
Query Preparation:
- Two SQL query buffers (emsQryBuf, emsQryLckBuf) are prepared using base queries (emsOutQuery, emsOutQueryLck).
- emsOutMsgs: An ArrayList initialized to hold EMS messages.
Parameter Processing from params:
- If params object is not null, the following actions occur:
  - Reads parameters like BLOCK_SIZE (default 100), WHERE_CLAUSE, NODE, MCS.
  - Processes the WHERE_CLAUSE to modify SQL filters dynamically.
  - If no dynamic columns (dlyMsgOutCols) are cached, retrieves them from the database using dlyMsgOutColumQry.
Retrieve Dynamic Columns:
- Executes a database query to fetch dynamic columns and adds them to a HashSet (dlyMsgOutCols).
- Uses JDBC (PreparedStatement and ResultSet) to retrieve and store the results.
- Ensures resources (ResultSet, PreparedStatement, Connection) are closed properly in a finally block.
Append Additional Filters:
- Adds the WHERE_CLAUSE to the two query buffers (emsQryBuf, emsQryLckBuf).
- Prepends "and" if necessary to maintain valid SQL syntax.
Set Block Size:
- Parses the BLOCK_SIZE parameter into an integer (paramBlockSize) with fallback to 100 in case of an error.
Parameter Defaults:
- Ensures parameters like NODE and MCS are not null by assigning default values as empty strings.
Final SQL Query Construction:
- Appends sorting (order by MEDIA_PRIORITY, MSG_PRIORITY) to the first query buffer (emsQryBuf).
- Modifies the second query buffer with locking (FOR UPDATE NOWAIT).
Database Connection and Query Execution:
- Obtains a database connection from a datasource with FCServiceLocator.
- Constructs a JDBC PreparedStatement from the built query for retrieval.
- Retrieves the current date if the module group (sModuleGroup) is "FCPMTS" (though it doesn't seem to be further utilized).
Debugging Information:
- Outputs debug logs at multiple stages to track progress and diagnostic information, such as whereCond, paramBlockSize, jobName, and the current date.

Purpose of the Code Block:

The objective of this code is to dynamically construct and execute SQL queries based on passed parameters (BLOCK_SIZE, WHERE_CLAUSE) to fetch EMS messages, potentially filtered and ordered, from a database. It also retrieves metadata if required, logs operations, handles exceptions, and ensures resource cleanup.

Key Observations:

It performs dynamic query construction with a focus on making use of a WHERE_CLAUSE provided via input.
Implements robust exception handling and resource cleanup (e.g., database connections).
May involve high-level orchestration in a job scheduler or messaging system due to the use of jobName and dynamic parameters.

Potential Use Cases:

Fetching messages or tasks for processing in a queuing system.
Dynamically filtering and locking database records for further updates or processing.

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