| package storm.trident.state.map; |
| |
| import java.io.Serializable; |
| import java.util.ArrayList; |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| public class MicroBatchIBackingMap<T> implements IBackingMap<T> { |
| IBackingMap<T> _delegate; |
| Options _options; |
| |
| |
| public static class Options implements Serializable { |
| public int maxMultiGetBatchSize = 0; // 0 means delegate batch size = trident batch size. |
| public int maxMultiPutBatchSize = 0; |
| } |
| |
| public MicroBatchIBackingMap(final Options options, final IBackingMap<T> delegate) { |
| _options = options; |
| _delegate = delegate; |
| assert options.maxMultiPutBatchSize >= 0; |
| assert options.maxMultiGetBatchSize >= 0; |
| } |
| |
| @Override |
| public void multiPut(final List<List<Object>> keys, final List<T> values) { |
| int thisBatchSize; |
| if(_options.maxMultiPutBatchSize == 0) { thisBatchSize = keys.size(); } |
| else { thisBatchSize = _options.maxMultiPutBatchSize; } |
| |
| LinkedList<List<Object>> keysTodo = new LinkedList<List<Object>>(keys); |
| LinkedList<T> valuesTodo = new LinkedList<T>(values); |
| |
| while(!keysTodo.isEmpty()) { |
| List<List<Object>> keysBatch = new ArrayList<List<Object>>(thisBatchSize); |
| List<T> valuesBatch = new ArrayList<T>(thisBatchSize); |
| for(int i=0; i<thisBatchSize && !keysTodo.isEmpty(); i++) { |
| keysBatch.add(keysTodo.removeFirst()); |
| valuesBatch.add(valuesTodo.removeFirst()); |
| } |
| |
| _delegate.multiPut(keysBatch, valuesBatch); |
| } |
| } |
| |
| @Override |
| public List<T> multiGet(final List<List<Object>> keys) { |
| int thisBatchSize; |
| if(_options.maxMultiGetBatchSize == 0) { thisBatchSize = keys.size(); } |
| else { thisBatchSize = _options.maxMultiGetBatchSize; } |
| |
| LinkedList<List<Object>> keysTodo = new LinkedList<List<Object>>(keys); |
| |
| List<T> ret = new ArrayList<T>(keys.size()); |
| |
| while(!keysTodo.isEmpty()) { |
| List<List<Object>> keysBatch = new ArrayList<List<Object>>(thisBatchSize); |
| for(int i=0; i<thisBatchSize && !keysTodo.isEmpty(); i++) { |
| keysBatch.add(keysTodo.removeFirst()); |
| } |
| |
| List<T> retSubset = _delegate.multiGet(keysBatch); |
| ret.addAll(retSubset); |
| } |
| |
| return ret; |
| } |
| } |