HBASE-17936 Refine sum endpoint example in ref guide
Signed-off-by: Michael Stack <stack@apache.org>
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@ -610,7 +610,7 @@ The effect is that the duplicate coprocessor is effectively ignored.
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+
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[source, java]
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----
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public class SumEndPoint extends SumService implements Coprocessor, CoprocessorService {
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public class SumEndPoint extends Sum.SumService implements Coprocessor, CoprocessorService {
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private RegionCoprocessorEnvironment env;
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@ -630,31 +630,33 @@ public class SumEndPoint extends SumService implements Coprocessor, CoprocessorS
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@Override
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public void stop(CoprocessorEnvironment env) throws IOException {
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// do mothing
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// do nothing
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}
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@Override
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public void getSum(RpcController controller, SumRequest request, RpcCallback done) {
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public void getSum(RpcController controller, Sum.SumRequest request, RpcCallback<Sum.SumResponse> done) {
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Scan scan = new Scan();
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scan.addFamily(Bytes.toBytes(request.getFamily()));
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scan.addColumn(Bytes.toBytes(request.getFamily()), Bytes.toBytes(request.getColumn()));
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SumResponse response = null;
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Sum.SumResponse response = null;
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InternalScanner scanner = null;
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try {
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scanner = env.getRegion().getScanner(scan);
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List results = new ArrayList();
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List<Cell> results = new ArrayList<>();
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boolean hasMore = false;
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long sum = 0L;
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do {
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hasMore = scanner.next(results);
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for (Cell cell : results) {
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sum = sum + Bytes.toLong(CellUtil.cloneValue(cell));
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}
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results.clear();
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} while (hasMore);
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long sum = 0L;
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response = SumResponse.newBuilder().setSum(sum).build();
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do {
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hasMore = scanner.next(results);
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for (Cell cell : results) {
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sum = sum + Bytes.toLong(CellUtil.cloneValue(cell));
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}
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results.clear();
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} while (hasMore);
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response = Sum.SumResponse.newBuilder().setSum(sum).build();
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} catch (IOException ioe) {
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ResponseConverter.setControllerException(controller, ioe);
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} finally {
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@ -664,6 +666,7 @@ public class SumEndPoint extends SumService implements Coprocessor, CoprocessorS
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} catch (IOException ignored) {}
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}
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}
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done.run(response);
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}
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}
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@ -681,24 +684,29 @@ Table table = connection.getTable(tableName);
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//HConnection connection = HConnectionManager.createConnection(conf);
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//HTableInterface table = connection.getTable("users");
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final SumRequest request = SumRequest.newBuilder().setFamily("salaryDet").setColumn("gross")
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.build();
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final Sum.SumRequest request = Sum.SumRequest.newBuilder().setFamily("salaryDet").setColumn("gross").build();
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try {
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Map<byte[], Long> results = table.CoprocessorService (SumService.class, null, null,
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new Batch.Call<SumService, Long>() {
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@Override
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public Long call(SumService aggregate) throws IOException {
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BlockingRpcCallback rpcCallback = new BlockingRpcCallback();
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aggregate.getSum(null, request, rpcCallback);
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SumResponse response = rpcCallback.get();
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return response.hasSum() ? response.getSum() : 0L;
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Map<byte[], Long> results = table.coprocessorService(
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Sum.SumService.class,
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null, /* start key */
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null, /* end key */
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new Batch.Call<Sum.SumService, Long>() {
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@Override
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public Long call(Sum.SumService aggregate) throws IOException {
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BlockingRpcCallback<Sum.SumResponse> rpcCallback = new BlockingRpcCallback<>();
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aggregate.getSum(null, request, rpcCallback);
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Sum.SumResponse response = rpcCallback.get();
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return response.hasSum() ? response.getSum() : 0L;
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}
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}
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});
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);
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for (Long sum : results.values()) {
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System.out.println("Sum = " + sum);
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}
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} catch (ServiceException e) {
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e.printStackTrace();
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e.printStackTrace();
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} catch (Throwable e) {
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e.printStackTrace();
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}
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