pyEuropePMC

Progress Callbacks Implementation Summary

Overview

Successfully implemented real-time progress tracking for large batch downloads and longer processes in PyEuropePMC FullTextClient. This professional enhancement provides users with comprehensive progress information during batch operations.

Implementation Status: COMPLETE

All requested features have been successfully implemented and tested:

Core Features Implemented

  1. ProgressInfo Class: Comprehensive progress tracking with detailed metrics
  2. Real-time Callbacks: Configurable progress callback system with customizable intervals
  3. Batch Enhancement: Enhanced download_fulltext_batch method with progress support
  4. Helper Methods: Modular design with extracted helper methods for maintainability
  5. Public API: ProgressInfo exported in main package for easy access

ProgressInfo Class Features

class ProgressInfo:
    """Comprehensive progress tracking for batch operations."""

    # Core Properties
    total_items: int              # Total number of items to process
    current_item: int = 0         # Current item being processed
    current_pmcid: Optional[str]  # Current PMC ID being processed
    format_type: str              # Download format (pdf, xml, html)
    status: str = "pending"       # Current status message

    # Statistics
    successful_downloads: int = 0  # Number of successful downloads
    failed_downloads: int = 0      # Number of failed downloads
    cache_hits: int = 0           # Number of cache hits
    current_file_size: int = 0    # Size of current file in bytes
    total_downloaded_bytes: int = 0 # Total bytes downloaded

    # Timing
    start_time: float             # Start timestamp

    # Computed Properties
    @property
    def progress_percent(self) -> float
    @property
    def elapsed_time(self) -> Optional[float]
    @property
    def estimated_remaining_time(self) -> Optional[float]
    @property
    def completion_rate(self) -> float

    # Utility Methods
    def to_dict(self) -> Dict[str, Any]

Enhanced Download Method

def download_fulltext_batch(
    self,
    pmcids: List[str],
    format_type: str = "pdf",
    output_dir: Optional[Union[str, Path]] = None,
    skip_errors: bool = True,
    progress_callback: Optional[Callable[[ProgressInfo], None]] = None,  # NEW
    progress_update_interval: float = 1.0,                               # NEW
) -> Dict[str, Optional[Path]]:

New Parameters:

Usage Examples

Basic Progress Tracking

from pyeuropepmc import FullTextClient, ProgressInfo

def simple_callback(progress: ProgressInfo):
    print(f"Progress: {progress.progress_percent:.1f}% - {progress.status}")

client = FullTextClient(enable_cache=True)
results = client.download_fulltext_batch(
    pmcids=["PMC1911200", "PMC3312970"],
    progress_callback=simple_callback,
    progress_update_interval=1.0
)

Detailed Progress Information

def detailed_callback(progress: ProgressInfo):
    print(f"đź“Š Progress: {progress.progress_percent:.1f}%")
    print(f"   Items: {progress.current_item}/{progress.total_items}")
    print(f"   Success: {progress.successful_downloads}")
    print(f"   Failed: {progress.failed_downloads}")
    print(f"   Cache hits: {progress.cache_hits}")
    if progress.estimated_remaining_time:
        print(f"   ETA: {progress.estimated_remaining_time:.1f}s")

Enhanced Visual Progress Bar

from tqdm import tqdm

class ProgressTracker:
    def __init__(self):
        self.pbar = tqdm(total=100, desc="Download", unit="%")

    def update(self, progress: ProgressInfo):
        self.pbar.n = progress.progress_percent
        self.pbar.set_postfix({
            'success': progress.successful_downloads,
            'failed': progress.failed_downloads,
            'cache': progress.cache_hits
        })
        self.pbar.refresh()

tracker = ProgressTracker()
results = client.download_fulltext_batch(
    pmcids=pmcids,
    progress_callback=tracker.update
)

Architecture & Design

Modular Design

The implementation uses a modular approach with helper methods to maintain code complexity under McCabe limits:

Performance Considerations

Error Handling

Testing & Validation

Test Results

âś… Progress Callback System: Fully functional

Demo Script

Created comprehensive examples/progress_callbacks_demo.py with:

Files Modified

Core Implementation

Documentation & Examples

Benefits Delivered

For Users

  1. Real-time Feedback: See download progress in real-time
  2. Time Estimation: Know how long remaining downloads will take
  3. Error Transparency: Understand success/failure rates during batch operations
  4. Cache Visibility: See cache hit rates and performance benefits
  5. Flexible Integration: Easy integration with existing UI frameworks

For Developers

  1. Professional API: Clean, well-documented progress callback interface
  2. Modular Design: Maintainable code with helper methods
  3. Comprehensive Testing: Robust error handling and edge case coverage
  4. Performance Optimized: Configurable callback intervals to prevent overhead
  5. Future-Ready: Extensible design for additional progress metrics

Integration with Existing Features

The progress callback system seamlessly integrates with all existing FullTextClient features:

Next Steps

The progress callback system is production-ready and provides:

  1. Complete Implementation: All requested features implemented and tested
  2. Professional Quality: Clean API, comprehensive documentation, robust error handling
  3. User-Friendly: Multiple usage patterns from simple to advanced
  4. Performance Optimized: Minimal overhead with configurable update intervals
  5. Extensible: Ready for future enhancements and additional progress metrics

Status: âś… FEATURE COMPLETE - Ready for production use

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