| /* |
| * Copyright 2010 The Apache Software Foundation |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.hadoop.hbase.rest; |
| |
| import java.io.IOException; |
| |
| import javax.ws.rs.DELETE; |
| import javax.ws.rs.GET; |
| import javax.ws.rs.Produces; |
| import javax.ws.rs.QueryParam; |
| import javax.ws.rs.WebApplicationException; |
| import javax.ws.rs.core.CacheControl; |
| import javax.ws.rs.core.Context; |
| import javax.ws.rs.core.Response; |
| import javax.ws.rs.core.Response.ResponseBuilder; |
| import javax.ws.rs.core.UriInfo; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| import org.apache.hadoop.hbase.KeyValue; |
| import org.apache.hadoop.hbase.rest.model.CellModel; |
| import org.apache.hadoop.hbase.rest.model.CellSetModel; |
| import org.apache.hadoop.hbase.rest.model.RowModel; |
| import org.apache.hadoop.hbase.util.Base64; |
| import org.apache.hadoop.hbase.util.Bytes; |
| |
| public class ScannerInstanceResource extends ResourceBase { |
| private static final Log LOG = |
| LogFactory.getLog(ScannerInstanceResource.class); |
| |
| static CacheControl cacheControl; |
| static { |
| cacheControl = new CacheControl(); |
| cacheControl.setNoCache(true); |
| cacheControl.setNoTransform(false); |
| } |
| |
| ResultGenerator generator; |
| String id; |
| int batch = 1; |
| |
| public ScannerInstanceResource(String table, String id, |
| ResultGenerator generator, int batch) throws IOException { |
| this.id = id; |
| this.generator = generator; |
| this.batch = batch; |
| } |
| |
| @GET |
| @Produces({MIMETYPE_XML, MIMETYPE_JSON, MIMETYPE_PROTOBUF}) |
| public Response get(final @Context UriInfo uriInfo, |
| @QueryParam("n") int maxRows, final @QueryParam("c") int maxValues) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("GET " + uriInfo.getAbsolutePath()); |
| } |
| servlet.getMetrics().incrementRequests(1); |
| CellSetModel model = new CellSetModel(); |
| RowModel rowModel = null; |
| byte[] rowKey = null; |
| int limit = batch; |
| if (maxValues > 0) { |
| limit = maxValues; |
| } |
| int count = limit; |
| do { |
| KeyValue value = null; |
| try { |
| value = generator.next(); |
| } catch (IllegalStateException e) { |
| ScannerResource.delete(id); |
| throw new WebApplicationException(Response.Status.GONE); |
| } |
| if (value == null) { |
| LOG.info("generator exhausted"); |
| // respond with 204 (No Content) if an empty cell set would be |
| // returned |
| if (count == limit) { |
| return Response.noContent().build(); |
| } |
| break; |
| } |
| if (rowKey == null) { |
| rowKey = value.getRow(); |
| rowModel = new RowModel(rowKey); |
| } |
| if (!Bytes.equals(value.getRow(), rowKey)) { |
| // if maxRows was given as a query param, stop if we would exceed the |
| // specified number of rows |
| if (maxRows > 0) { |
| if (--maxRows == 0) { |
| generator.putBack(value); |
| break; |
| } |
| } |
| model.addRow(rowModel); |
| rowKey = value.getRow(); |
| rowModel = new RowModel(rowKey); |
| } |
| rowModel.addCell( |
| new CellModel(value.getFamily(), value.getQualifier(), |
| value.getTimestamp(), value.getValue())); |
| } while (--count > 0); |
| model.addRow(rowModel); |
| ResponseBuilder response = Response.ok(model); |
| response.cacheControl(cacheControl); |
| return response.build(); |
| } |
| |
| @GET |
| @Produces(MIMETYPE_BINARY) |
| public Response getBinary(final @Context UriInfo uriInfo) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("GET " + uriInfo.getAbsolutePath() + " as " + |
| MIMETYPE_BINARY); |
| } |
| servlet.getMetrics().incrementRequests(1); |
| try { |
| KeyValue value = generator.next(); |
| if (value == null) { |
| LOG.info("generator exhausted"); |
| return Response.noContent().build(); |
| } |
| ResponseBuilder response = Response.ok(value.getValue()); |
| response.cacheControl(cacheControl); |
| response.header("X-Row", Base64.encodeBytes(value.getRow())); |
| response.header("X-Column", |
| Base64.encodeBytes( |
| KeyValue.makeColumn(value.getFamily(), value.getQualifier()))); |
| response.header("X-Timestamp", value.getTimestamp()); |
| return response.build(); |
| } catch (IllegalStateException e) { |
| ScannerResource.delete(id); |
| throw new WebApplicationException(Response.Status.GONE); |
| } |
| } |
| |
| @DELETE |
| public Response delete(final @Context UriInfo uriInfo) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("DELETE " + uriInfo.getAbsolutePath()); |
| } |
| servlet.getMetrics().incrementRequests(1); |
| if (servlet.isReadOnly()) { |
| throw new WebApplicationException(Response.Status.FORBIDDEN); |
| } |
| ScannerResource.delete(id); |
| return Response.ok().build(); |
| } |
| } |