| --- |
| title: Filtering Entries During Import or Export |
| --- |
| |
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| |
| You can customize your snapshot by filtering entries during the import or export of a region or a cache. |
| |
| For example, use filters to limit the export of data to a certain date range. If you set up a filter on the import or export of a cache, the filter is applied to every single region in the cache. |
| |
| The following example filters snapshot data by even numbered keys. |
| |
| ``` pre |
| File mySnapshot = ... |
| Region<Integer, MyObject> region = ... |
| |
| SnapshotFilter<Integer, MyObject> even = new SnapshotFilter<Integer, MyObject>() { |
| @Override |
| public boolean accept(Entry<Integer, MyObject> entry) { |
| return entry.getKey() % 2 == 0; |
| } |
| }; |
| |
| RegionSnapshotService<Integer, MyObject> snapsrv = region.getSnapshotService(); |
| SnapshotOptions<Integer, MyObject> options = snapsrv.createOptions().setFilter(even); |
| |
| // only save cache entries with an even key |
| snapsrv.save(mySnapshot, SnapshotFormat.GEMFIRE, options); |
| ``` |
| |
| |