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20 package org.apache.hadoop.hbase.rest;
21
22 import java.io.IOException;
23 import java.net.URI;
24 import java.util.Collections;
25 import java.util.HashMap;
26 import java.util.Map;
27
28 import javax.ws.rs.Consumes;
29 import javax.ws.rs.POST;
30 import javax.ws.rs.PUT;
31 import javax.ws.rs.Path;
32 import javax.ws.rs.PathParam;
33 import javax.ws.rs.core.Context;
34 import javax.ws.rs.core.Response;
35 import javax.ws.rs.core.UriBuilder;
36 import javax.ws.rs.core.UriInfo;
37
38 import org.apache.commons.logging.Log;
39 import org.apache.commons.logging.LogFactory;
40
41 import org.apache.hadoop.classification.InterfaceAudience;
42 import org.apache.hadoop.hbase.TableNotFoundException;
43 import org.apache.hadoop.hbase.filter.Filter;
44 import org.apache.hadoop.hbase.rest.model.ScannerModel;
45
46 @InterfaceAudience.Private
47 public class ScannerResource extends ResourceBase {
48
49 private static final Log LOG = LogFactory.getLog(ScannerResource.class);
50
51 static final Map<String,ScannerInstanceResource> scanners =
52 Collections.synchronizedMap(new HashMap<String,ScannerInstanceResource>());
53
54 TableResource tableResource;
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60
61 public ScannerResource(TableResource tableResource)throws IOException {
62 super();
63 this.tableResource = tableResource;
64 }
65
66 static boolean delete(final String id) {
67 ScannerInstanceResource instance = scanners.remove(id);
68 if (instance != null) {
69 instance.generator.close();
70 return true;
71 } else {
72 return false;
73 }
74 }
75
76 Response update(final ScannerModel model, final boolean replace,
77 final UriInfo uriInfo) {
78 servlet.getMetrics().incrementRequests(1);
79 if (servlet.isReadOnly()) {
80 return Response.status(Response.Status.FORBIDDEN)
81 .type(MIMETYPE_TEXT).entity("Forbidden" + CRLF)
82 .build();
83 }
84 byte[] endRow = model.hasEndRow() ? model.getEndRow() : null;
85 RowSpec spec = new RowSpec(model.getStartRow(), endRow,
86 model.getColumns(), model.getStartTime(), model.getEndTime(),
87 model.getMaxVersions());
88 try {
89 Filter filter = ScannerResultGenerator.buildFilterFromModel(model);
90 String tableName = tableResource.getName();
91 ScannerResultGenerator gen =
92 new ScannerResultGenerator(tableName, spec, filter, model.getCaching());
93 String id = gen.getID();
94 ScannerInstanceResource instance =
95 new ScannerInstanceResource(tableName, id, gen, model.getBatch());
96 scanners.put(id, instance);
97 if (LOG.isDebugEnabled()) {
98 LOG.debug("new scanner: " + id);
99 }
100 UriBuilder builder = uriInfo.getAbsolutePathBuilder();
101 URI uri = builder.path(id).build();
102 servlet.getMetrics().incrementSucessfulPutRequests(1);
103 return Response.created(uri).build();
104 } catch (Exception e) {
105 servlet.getMetrics().incrementFailedPutRequests(1);
106 if (e instanceof TableNotFoundException) {
107 return Response.status(Response.Status.NOT_FOUND)
108 .type(MIMETYPE_TEXT).entity("Not found" + CRLF)
109 .build();
110 } else if (e instanceof RuntimeException) {
111 return Response.status(Response.Status.BAD_REQUEST)
112 .type(MIMETYPE_TEXT).entity("Bad request" + CRLF)
113 .build();
114 }
115 return Response.status(Response.Status.SERVICE_UNAVAILABLE)
116 .type(MIMETYPE_TEXT).entity("Unavailable" + CRLF)
117 .build();
118 }
119 }
120
121 @PUT
122 @Consumes({MIMETYPE_XML, MIMETYPE_JSON, MIMETYPE_PROTOBUF,
123 MIMETYPE_PROTOBUF_IETF})
124 public Response put(final ScannerModel model,
125 final @Context UriInfo uriInfo) {
126 if (LOG.isDebugEnabled()) {
127 LOG.debug("PUT " + uriInfo.getAbsolutePath());
128 }
129 return update(model, true, uriInfo);
130 }
131
132 @POST
133 @Consumes({MIMETYPE_XML, MIMETYPE_JSON, MIMETYPE_PROTOBUF,
134 MIMETYPE_PROTOBUF_IETF})
135 public Response post(final ScannerModel model,
136 final @Context UriInfo uriInfo) {
137 if (LOG.isDebugEnabled()) {
138 LOG.debug("POST " + uriInfo.getAbsolutePath());
139 }
140 return update(model, false, uriInfo);
141 }
142
143 @Path("{scanner: .+}")
144 public ScannerInstanceResource getScannerInstanceResource(
145 final @PathParam("scanner") String id) throws IOException {
146 ScannerInstanceResource instance = scanners.get(id);
147 if (instance == null) {
148 servlet.getMetrics().incrementFailedGetRequests(1);
149 return new ScannerInstanceResource();
150 } else {
151 servlet.getMetrics().incrementSucessfulGetRequests(1);
152 }
153 return instance;
154 }
155 }