Java Rows.isEmpty方法代码示例

import com.netflix.astyanax.model.Rows; //导入方法依赖的package包/类
boolean isRequireIsDone() throws ConnectionException {
	if (required_keys == null) {
		return true;
	}
	if (required_keys.isEmpty()) {
		return true;
	}
	
	Rows<String, String> rows = keyspace.prepareQuery(CF_QUEUE).getKeySlice(required_keys).withColumnSlice("status").execute().getResult();
	if (rows == null) {
		return false;
	}
	if (rows.isEmpty()) {
		return false;
	}
	for (Row<String, String> row : rows) {
		if (row.getColumns().getStringValue("status", JobStatus.WAITING.name()).equals(JobStatus.DONE.name()) == false) {
			return false;
		}
	}
	return true;
}
 

import com.netflix.astyanax.model.Rows; //导入方法依赖的package包/类
/**
 * @return never null if keys is not empty
 */
public static LinkedHashMap<String, JobStatus> getJobsStatusByKeys(Collection<String> keys) throws ConnectionException {
	if (keys == null) {
		return null;
	}
	if (keys.size() == 0) {
		return null;
	}
	LinkedHashMap<String, JobStatus> status = new LinkedHashMap<String, JobStatus>(keys.size());
	Rows<String, String> rows = keyspace.prepareQuery(CF_QUEUE).getKeySlice(keys).withColumnSlice("status").execute().getResult();
	if (rows.isEmpty()) {
		return status;
	}
	for (Row<String, String> row : rows) {
		if (row.getColumns().isEmpty()) {
			continue;
		}
		status.put(row.getKey(), JobStatus.valueOf(row.getColumns().getStringValue("status", JobStatus.POSTPONED.name())));
	}
	return status;
}
 

import com.netflix.astyanax.model.Rows; //导入方法依赖的package包/类
/**
 * {@inheritDoc}
 */
@Override
public synchronized T findOne(ID id) {
    try {
        String cql = cqlGen.buildFindOneStatement();
        PreparedCqlQuery<String, String> preparedStatement = doPreparedCqlRead(cql);
        Map<String, ByteBuffer> serializedKeyValues = spec.getSerializedKeyValues(id);
        for (String column : spec.getKeyColumns()) {
            preparedStatement = preparedStatement.withValue(serializedKeyValues.get(column));
        }
        OperationResult<CqlResult<String, String>> opResult = preparedStatement.execute();
        LOGGER.debug("attempts: {}, latency: {}ms", opResult.getAttemptsCount(),
            opResult.getLatency(TimeUnit.MILLISECONDS));
        CqlResult<String, String> resultSet = opResult.getResult();
        Rows<String, String> resultSetRows = resultSet.getRows();
        if (resultSetRows.isEmpty()) {
            return null;
        } else if (resultSetRows.size() > 1) {
            throw new DataRetrievalFailureException("Got several rows for single key");
        } else {
            Row<String, String> row = resultSetRows.getRowByIndex(0);
            ColumnList<String> columns = row.getColumns();
            return spec.map(columns);
        }
    } catch (ConnectionException e) {
        throw new DataRetrievalFailureException("Error while executing CQL3 query", e);
    }
}
 

import com.netflix.astyanax.model.Rows; //导入方法依赖的package包/类
@Override
public QueryResult listRows(String cursor, Integer rowLimit, Integer columnLimit) throws PaasException {
    try {
        invariant();
        
        // Execute the query
        Partitioner partitioner = keyspace.getPartitioner();
        Rows<ByteBuffer, ByteBuffer> result = keyspace
            .prepareQuery(columnFamily)
            .getKeyRange(null,  null, cursor != null ? cursor : partitioner.getMinToken(),  partitioner.getMaxToken(),  rowLimit)
            .execute()
            .getResult();
        
        // Convert raw data into a simple sparse tree
        SchemalessRows.Builder builder = SchemalessRows.builder();
        for (Row<ByteBuffer, ByteBuffer> row : result) { 
            Map<String, String> columns = Maps.newHashMap();
            for (Column<ByteBuffer> column : row.getColumns()) {
                columns.put(serializers.columnAsString(column.getRawName()), serializers.valueAsString(column.getRawName(), column.getByteBufferValue()));
            }
            builder.addRow(serializers.keyAsString(row.getKey()), columns);
        }
        
        QueryResult dr = new QueryResult();
        dr.setSrows(builder.build());
        
        if (!result.isEmpty()) {
            dr.setCursor(partitioner.getTokenForKey(Iterables.getLast(result).getKey()));
        }
        return dr;
    } catch (ConnectionException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return null;
}
 

import com.netflix.astyanax.model.Rows; //导入方法依赖的package包/类
private boolean isRequireHasProblemThisSwitchStatus() throws ConnectionException {
	if (required_keys == null) {
		return false;
	}
	if (required_keys.isEmpty()) {
		return false;
	}
	
	Rows<String, String> rows = keyspace.prepareQuery(CF_QUEUE).getKeySlice(required_keys).withColumnSlice("status").execute().getResult();
	if (rows == null) {
		return true;
	}
	if (rows.isEmpty()) {
		return true;
	}
	for (Row<String, String> row : rows) {
		String status = row.getColumns().getStringValue("status", JobStatus.WAITING.name());
		
		if (status.equals(JobStatus.WAITING.name())) {
			continue;
		} else if (status.equals(JobStatus.DONE.name())) {
			continue;
		} else if (status.equals(JobStatus.PROCESSING.name())) {
			continue;
		} else if (status.equals(JobStatus.ERROR.name())) {
			this.status = JobStatus.ERROR;
			return true;
		} else if (status.equals(JobStatus.CANCELED.name())) {
			if (this.status != JobStatus.ERROR) {
				this.status = JobStatus.CANCELED;
			}
			return true;
		} else if (status.equals(JobStatus.STOPPED.name())) {
			if (this.status != JobStatus.ERROR) {
				this.status = JobStatus.CANCELED;
			}
			return true;
		} else if (status.equals(JobStatus.TOO_LONG_DURATION.name())) {
			if (this.status != JobStatus.ERROR) {
				this.status = JobStatus.CANCELED;
			}
			return true;
		} else if (status.equals(JobStatus.TOO_OLD.name())) {
			if (this.status != JobStatus.ERROR) {
				this.status = JobStatus.CANCELED;
			}
			return true;
		}
	}
	return false;
}