[OODT-451] Implement Marker File precondition

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.3
• Fix Version/s: 0.4
• Component/s: metadata container
• Assignee: Luca Cinquini
• Reporter: Luca Cinquini
• Created: 27/Apr/12 19:32
• Updated: 08/May/12 11:49
• Resolved: 08/May/12 11:49

Description

Sometimes it is necessary to process a product directory only when the directory has been fully produced, or transferred, which can be indicated by the existence of a special "marker file". It is suggested that we implement a precondition that checks for the existence of a given file within a given product. This precondition would be implemented similarly to org.apache.oodt.cas.metadata.preconditions.ExistanceCheckComparator, but would check for a file at location:
File file = new File(product.getAbsolutePath()+"/"+filePath);