Examples with ResumableStreamIterator com.google.cloud.spanner.AbstractResultSet.ResumableStreamIterator used on opensource projects

Example 1 with ResumableStreamIterator

use of com.google.cloud.spanner.AbstractResultSet.ResumableStreamIterator in project java-spanner by googleapis.

the class AbstractReadContext method readInternalWithOptions.

ResultSet readInternalWithOptions(String table, @Nullable String index, KeySet keys, Iterable<String> columns, final Options readOptions, ByteString partitionToken) {
    beforeReadOrQuery();
    final ReadRequest.Builder builder = ReadRequest.newBuilder().setSession(session.getName()).setTable(checkNotNull(table)).addAllColumns(columns);
    if (readOptions.hasLimit()) {
        builder.setLimit(readOptions.limit());
    }
    keys.appendToProto(builder.getKeySetBuilder());
    if (index != null) {
        builder.setIndex(index);
    }
    if (partitionToken != null) {
        builder.setPartitionToken(partitionToken);
    }
    final int prefetchChunks = readOptions.hasPrefetchChunks() ? readOptions.prefetchChunks() : defaultPrefetchChunks;
    ResumableStreamIterator stream = new ResumableStreamIterator(MAX_BUFFERED_CHUNKS, SpannerImpl.READ, span) {

        @Override
        CloseableIterator<PartialResultSet> startStream(@Nullable ByteString resumeToken) {
            GrpcStreamIterator stream = new GrpcStreamIterator(prefetchChunks);
            TransactionSelector selector = null;
            if (resumeToken != null) {
                builder.setResumeToken(resumeToken);
                selector = getTransactionSelector();
            } else if (!builder.hasTransaction()) {
                selector = getTransactionSelector();
            }
            if (selector != null) {
                builder.setTransaction(selector);
            }
            builder.setRequestOptions(buildRequestOptions(readOptions));
            SpannerRpc.StreamingCall call = rpc.read(builder.build(), stream.consumer(), session.getOptions());
            call.request(prefetchChunks);
            stream.setCall(call, /* withBeginTransaction = */
            builder.getTransaction().hasBegin());
            return stream;
        }
    };
    return new GrpcResultSet(stream, this);
}

Example 2 with ResumableStreamIterator

use of com.google.cloud.spanner.AbstractResultSet.ResumableStreamIterator in project java-spanner by googleapis.

the class AbstractReadContext method executeQueryInternalWithOptions.

ResultSet executeQueryInternalWithOptions(final Statement statement, final com.google.spanner.v1.ExecuteSqlRequest.QueryMode queryMode, final Options options, final ByteString partitionToken) {
    beforeReadOrQuery();
    final int prefetchChunks = options.hasPrefetchChunks() ? options.prefetchChunks() : defaultPrefetchChunks;
    final ExecuteSqlRequest.Builder request = getExecuteSqlRequestBuilder(statement, queryMode, options, /* withTransactionSelector = */
    false);
    ResumableStreamIterator stream = new ResumableStreamIterator(MAX_BUFFERED_CHUNKS, SpannerImpl.QUERY, span) {

        @Override
        CloseableIterator<PartialResultSet> startStream(@Nullable ByteString resumeToken) {
            GrpcStreamIterator stream = new GrpcStreamIterator(statement, prefetchChunks);
            if (partitionToken != null) {
                request.setPartitionToken(partitionToken);
            }
            TransactionSelector selector = null;
            if (resumeToken != null) {
                request.setResumeToken(resumeToken);
                selector = getTransactionSelector();
            } else if (!request.hasTransaction()) {
                selector = getTransactionSelector();
            }
            if (selector != null) {
                request.setTransaction(selector);
            }
            SpannerRpc.StreamingCall call = rpc.executeQuery(request.build(), stream.consumer(), session.getOptions());
            call.request(prefetchChunks);
            stream.setCall(call, request.getTransaction().hasBegin());
            return stream;
        }
    };
    return new GrpcResultSet(stream, this);
}