COBOL READY

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*> READY statement for synchronization and state management
IDENTIFICATION DIVISION.
PROGRAM-ID. READY-DEMONSTRATION.
 
ENVIRONMENT DIVISION.
INPUT-OUTPUT SECTION.
FILE-CONTROL.
    SELECT MASTER-FILE
           ASSIGN TO "master.dat"
           ORGANIZATION IS INDEXED
           ACCESS MODE IS DYNAMIC
           RECORD KEY IS MASTER-KEY
           FILE STATUS IS WS-MASTER-STATUS.
    
    SELECT TRANSACTION-FILE
           ASSIGN TO "transactions.dat"
           ORGANIZATION IS SEQUENTIAL
           ACCESS MODE IS SEQUENTIAL
           FILE STATUS IS WS-TRANS-STATUS.
    
    SELECT LOG-FILE
           ASSIGN TO "process.log"
           ORGANIZATION IS SEQUENTIAL
           ACCESS MODE IS SEQUENTIAL
           FILE STATUS IS WS-LOG-STATUS.
 
DATA DIVISION.
FILE SECTION.
FD  MASTER-FILE.
01  MASTER-RECORD.
    05 MASTER-KEY           PIC X(10).
    05 MASTER-DATA          PIC X(100).
    05 MASTER-STATUS        PIC X.
    05 MASTER-TIMESTAMP     PIC X(14).
 
FD  TRANSACTION-FILE.
01  TRANSACTION-RECORD.
    05 TRANS-TYPE           PIC X(2).
    05 TRANS-KEY            PIC X(10).
    05 TRANS-DATA           PIC X(50).
    05 TRANS-AMOUNT         PIC S9(7)V99 COMP-3.
 
FD  LOG-FILE.
01  LOG-RECORD             PIC X(150).
 
WORKING-STORAGE SECTION.
01  WS-FILE-STATUS.
    05 WS-MASTER-STATUS     PIC XX.
    05 WS-TRANS-STATUS      PIC XX.
    05 WS-LOG-STATUS        PIC XX.
 
01  WS-PROCESSING-CONTROL.
    05 WS-READY-STATE       PIC X VALUE 'N'.
    05 WS-PROCESSING-PHASE  PIC X(15).
    05 WS-SYNC-POINT        PIC 9(3) VALUE 0.
    05 WS-BATCH-NUMBER      PIC 9(5) VALUE 0.
 
01  WS-COORDINATION-FLAGS.
    05 WS-FILES-SYNCHRONIZED PIC X VALUE 'N'.
    05 WS-CHECKPOINT-READY  PIC X VALUE 'N'.
    05 WS-COMMIT-READY      PIC X VALUE 'N'.
    05 WS-ROLLBACK-NEEDED   PIC X VALUE 'N'.
 
PROCEDURE DIVISION.
MAIN-READY-PROCESSING.
    DISPLAY "=== COBOL READY DEMONSTRATION ==="
    
    PERFORM INITIALIZE-PROCESSING
    PERFORM ESTABLISH-READY-STATE
    PERFORM DEMONSTRATE-SYNCHRONIZED-PROCESSING
    PERFORM DEMONSTRATE-CHECKPOINT-COORDINATION
    PERFORM FINALIZE-PROCESSING
    
    DISPLAY "=== READY PROCESSING COMPLETE ==="
    STOP RUN.
 
INITIALIZE-PROCESSING.
    DISPLAY " "
    DISPLAY "🚀 INITIALIZING PROCESSING"
    DISPLAY "=========================="
    
    OPEN I-O MASTER-FILE
    OPEN INPUT TRANSACTION-FILE
    OPEN OUTPUT LOG-FILE
    
    MOVE "INITIALIZATION" TO WS-PROCESSING-PHASE
    MOVE 1 TO WS-SYNC-POINT
    
    DISPLAY "✅ Files opened for processing"
    DISPLAY "✅ Processing initialized".
 
ESTABLISH-READY-STATE.
    DISPLAY " "
    DISPLAY "🎯 ESTABLISHING READY STATE"
    DISPLAY "==========================="
    
    *> Prepare system for coordinated processing
    MOVE "PREPARING" TO WS-PROCESSING-PHASE
    
    *> Verify file accessibility
    PERFORM VERIFY-FILE-READY-STATE
    
    *> Establish synchronization
    PERFORM ESTABLISH-SYNCHRONIZATION
    
    *> Confirm ready state
    MOVE 'Y' TO WS-READY-STATE
    MOVE "READY" TO WS-PROCESSING-PHASE
    
    DISPLAY "✅ System ready for processing"
    PERFORM LOG-READY-STATE.
 
VERIFY-FILE-READY-STATE.
    DISPLAY "🔍 Verifying file ready states..."
    
    *> Check master file status
    IF WS-MASTER-STATUS = "00"
        DISPLAY "  ✅ Master file ready"
    ELSE
        DISPLAY "  ❌ Master file not ready: " WS-MASTER-STATUS
        MOVE 'Y' TO WS-ROLLBACK-NEEDED
    END-IF
    
    *> Check transaction file status
    IF WS-TRANS-STATUS = "00"
        DISPLAY "  ✅ Transaction file ready"
    ELSE
        DISPLAY "  ❌ Transaction file not ready: " WS-TRANS-STATUS
        MOVE 'Y' TO WS-ROLLBACK-NEEDED
    END-IF
    
    *> Check log file status
    IF WS-LOG-STATUS = "00"
        DISPLAY "  ✅ Log file ready"
    ELSE
        DISPLAY "  ❌ Log file not ready: " WS-LOG-STATUS
        MOVE 'Y' TO WS-ROLLBACK-NEEDED
    END-IF.
 
ESTABLISH-SYNCHRONIZATION.
    DISPLAY "🔗 Establishing synchronization points..."
    
    *> Set synchronization checkpoint
    ADD 1 TO WS-SYNC-POINT
    MOVE 'Y' TO WS-FILES-SYNCHRONIZED
    
    *> Log synchronization establishment
    STRING "SYNC POINT " WS-SYNC-POINT " ESTABLISHED AT "
           FUNCTION CURRENT-DATE(9:14)
           DELIMITED BY SIZE INTO LOG-RECORD
    WRITE LOG-RECORD
    
    DISPLAY "  ✅ Synchronization point " WS-SYNC-POINT " established".
 
DEMONSTRATE-SYNCHRONIZED-PROCESSING.
    DISPLAY " "
    DISPLAY "⚙️ SYNCHRONIZED PROCESSING"
    DISPLAY "=========================="
    
    IF WS-READY-STATE = 'Y'
        MOVE "PROCESSING" TO WS-PROCESSING-PHASE
        PERFORM COORDINATED-BATCH-PROCESSING
    ELSE
        DISPLAY "❌ System not ready - skipping processing"
        PERFORM HANDLE-NOT-READY-STATE
    END-IF.
 
COORDINATED-BATCH-PROCESSING.
    DISPLAY "📦 Starting coordinated batch processing..."
    
    *> Process transactions in coordinated manner
    PERFORM PROCESS-TRANSACTION-BATCH
    
    *> Establish processing checkpoint
    PERFORM ESTABLISH-PROCESSING-CHECKPOINT
    
    *> Continue with next phase
    PERFORM ADVANCE-TO-NEXT-PHASE.
 
PROCESS-TRANSACTION-BATCH.
    MOVE 1001 TO WS-BATCH-NUMBER
    
    DISPLAY "Processing batch " WS-BATCH-NUMBER "..."
    
    *> Simulate transaction processing
    PERFORM 5 TIMES
        PERFORM PROCESS-SINGLE-TRANSACTION
        
        *> Check if ready for checkpoint
        PERFORM CHECK-CHECKPOINT-READINESS
    END-PERFORM
    
    DISPLAY "✅ Batch " WS-BATCH-NUMBER " completed".
 
PROCESS-SINGLE-TRANSACTION.
    *> Simulate transaction processing with coordination
    DISPLAY "  🔄 Processing transaction..."
    
    *> Update master file (simulated)
    MOVE "TRANS001" TO MASTER-KEY
    MOVE FUNCTION CURRENT-DATE(1:14) TO MASTER-TIMESTAMP
    
    *> Log transaction processing
    STRING "TRANSACTION PROCESSED - BATCH " WS-BATCH-NUMBER
           " AT " FUNCTION CURRENT-DATE(9:14)
           DELIMITED BY SIZE INTO LOG-RECORD
    WRITE LOG-RECORD.
 
CHECK-CHECKPOINT-READINESS.
    *> Determine if system is ready for checkpoint
    IF WS-FILES-SYNCHRONIZED = 'Y' AND
       WS-READY-STATE = 'Y'
        MOVE 'Y' TO WS-CHECKPOINT-READY
    END-IF.
 
ESTABLISH-PROCESSING-CHECKPOINT.
    DISPLAY "📍 Establishing processing checkpoint..."
    
    IF WS-CHECKPOINT-READY = 'Y'
        ADD 1 TO WS-SYNC-POINT
        
        *> Log checkpoint
        STRING "CHECKPOINT " WS-SYNC-POINT " - BATCH " WS-BATCH-NUMBER
               " AT " FUNCTION CURRENT-DATE(9:14)
               DELIMITED BY SIZE INTO LOG-RECORD
        WRITE LOG-RECORD
        
        DISPLAY "  ✅ Checkpoint " WS-SYNC-POINT " established"
        MOVE 'N' TO WS-CHECKPOINT-READY
    ELSE
        DISPLAY "  ⚠️ System not ready for checkpoint"
    END-IF.
 
ADVANCE-TO-NEXT-PHASE.
    DISPLAY "⏭️ Advancing to next processing phase..."
    
    EVALUATE WS-PROCESSING-PHASE
        WHEN "PROCESSING"
            MOVE "VALIDATION" TO WS-PROCESSING-PHASE
        WHEN "VALIDATION"
            MOVE "COMPLETION" TO WS-PROCESSING-PHASE
        WHEN "COMPLETION"
            MOVE "FINALIZATION" TO WS-PROCESSING-PHASE
    END-EVALUATE
    
    DISPLAY "  📊 Phase advanced to: " WS-PROCESSING-PHASE.
 
DEMONSTRATE-CHECKPOINT-COORDINATION.
    DISPLAY " "
    DISPLAY "📍 CHECKPOINT COORDINATION"
    DISPLAY "=========================="
    
    PERFORM COORDINATE-CHECKPOINT-OPERATIONS
    PERFORM VERIFY-CHECKPOINT-INTEGRITY
    PERFORM ESTABLISH-RECOVERY-POINT.
 
COORDINATE-CHECKPOINT-OPERATIONS.
    DISPLAY "🔗 Coordinating checkpoint operations..."
    
    *> Prepare for checkpoint
    MOVE "CHECKPOINT_PREP" TO WS-PROCESSING-PHASE
    
    *> Ensure all files are synchronized
    PERFORM VERIFY-FILE-SYNCHRONIZATION
    
    *> Execute checkpoint
    IF WS-FILES-SYNCHRONIZED = 'Y'
        PERFORM EXECUTE-COORDINATED-CHECKPOINT
    ELSE
        DISPLAY "❌ Files not synchronized - checkpoint deferred"
    END-IF.
 
VERIFY-FILE-SYNCHRONIZATION.
    DISPLAY "  🔍 Verifying file synchronization..."
    
    *> Check if all files are in consistent state
    IF WS-MASTER-STATUS = "00" AND
       WS-TRANS-STATUS = "00" AND
       WS-LOG-STATUS = "00"
        MOVE 'Y' TO WS-FILES-SYNCHRONIZED
        DISPLAY "    ✅ All files synchronized"
    ELSE
        MOVE 'N' TO WS-FILES-SYNCHRONIZED
        DISPLAY "    ❌ File synchronization failed"
    END-IF.
 
EXECUTE-COORDINATED-CHECKPOINT.
    ADD 1 TO WS-SYNC-POINT
    
    DISPLAY "  💾 Executing checkpoint " WS-SYNC-POINT "..."
    
    *> Log checkpoint execution
    STRING "COORDINATED CHECKPOINT " WS-SYNC-POINT 
           " EXECUTED AT " FUNCTION CURRENT-DATE(9:14)
           DELIMITED BY SIZE INTO LOG-RECORD
    WRITE LOG-RECORD
    
    MOVE 'Y' TO WS-COMMIT-READY
    DISPLAY "    ✅ Checkpoint executed successfully".
 
VERIFY-CHECKPOINT-INTEGRITY.
    DISPLAY "  🛡️ Verifying checkpoint integrity..."
    
    IF WS-COMMIT-READY = 'Y' AND
       WS-FILES-SYNCHRONIZED = 'Y'
        DISPLAY "    ✅ Checkpoint integrity verified"
    ELSE
        DISPLAY "    ❌ Checkpoint integrity check failed"
        MOVE 'Y' TO WS-ROLLBACK-NEEDED
    END-IF.
 
ESTABLISH-RECOVERY-POINT.
    DISPLAY "  🔄 Establishing recovery point..."
    
    IF WS-ROLLBACK-NEEDED = 'N'
        *> Commit the checkpoint
        PERFORM COMMIT-CHECKPOINT
    ELSE
        *> Rollback if needed
        PERFORM ROLLBACK-PROCESSING
    END-IF.
 
COMMIT-CHECKPOINT.
    DISPLAY "    💾 Committing checkpoint..."
    
    STRING "CHECKPOINT " WS-SYNC-POINT " COMMITTED AT "
           FUNCTION CURRENT-DATE(9:14)
           DELIMITED BY SIZE INTO LOG-RECORD
    WRITE LOG-RECORD
    
    MOVE 'N' TO WS-COMMIT-READY
    DISPLAY "    ✅ Checkpoint committed successfully".
 
ROLLBACK-PROCESSING.
    DISPLAY "    🔙 Rolling back processing..."
    
    STRING "ROLLBACK INITIATED AT " FUNCTION CURRENT-DATE(9:14)
           " - SYNC POINT " WS-SYNC-POINT
           DELIMITED BY SIZE INTO LOG-RECORD
    WRITE LOG-RECORD
    
    MOVE 'N' TO WS-ROLLBACK-NEEDED
    DISPLAY "    ⚠️ Processing rolled back".
 
HANDLE-NOT-READY-STATE.
    DISPLAY "🚫 Handling not-ready state..."
    
    MOVE "ERROR_RECOVERY" TO WS-PROCESSING-PHASE
    
    STRING "SYSTEM NOT READY - RECOVERY INITIATED AT "
           FUNCTION CURRENT-DATE(9:14)
           DELIMITED BY SIZE INTO LOG-RECORD
    WRITE LOG-RECORD
    
    DISPLAY "  ⚠️ System placed in recovery mode".
 
LOG-READY-STATE.
    STRING "SYSTEM READY STATE ESTABLISHED AT "
           FUNCTION CURRENT-DATE(9:14)
           " - SYNC POINT " WS-SYNC-POINT
           DELIMITED BY SIZE INTO LOG-RECORD
    WRITE LOG-RECORD.
 
FINALIZE-PROCESSING.
    DISPLAY " "
    DISPLAY "🏁 FINALIZING PROCESSING"
    DISPLAY "======================="
    
    MOVE "FINALIZATION" TO WS-PROCESSING-PHASE
    
    *> Final checkpoint
    PERFORM ESTABLISH-FINAL-CHECKPOINT
    
    *> Close files
    CLOSE MASTER-FILE
    CLOSE TRANSACTION-FILE
    CLOSE LOG-FILE
    
    DISPLAY "✅ Processing finalized successfully".
 
ESTABLISH-FINAL-CHECKPOINT.
    ADD 1 TO WS-SYNC-POINT
    
    STRING "FINAL CHECKPOINT " WS-SYNC-POINT 
           " - PROCESSING COMPLETE AT "
           FUNCTION CURRENT-DATE(9:14)
           DELIMITED BY SIZE INTO LOG-RECORD
    WRITE LOG-RECORD
    
    DISPLAY "  📍 Final checkpoint " WS-SYNC-POINT " established".