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1 | // Copyright (c) 2011-present, Facebook, Inc. All rights reserved. |
2 | // This source code is licensed under the BSD-style license found in the | |
3 | // LICENSE file in the root directory of this source tree. An additional grant | |
4 | // of patent rights can be found in the PATENTS file in the same directory. | |
5 | // | |
6 | // This file implements the callback "bridge" between Java and C++ for | |
7 | // rocksdb::Comparator. | |
8 | ||
9 | #include "rocksjni/writebatchhandlerjnicallback.h" | |
10 | #include "rocksjni/portal.h" | |
11 | ||
12 | namespace rocksdb { | |
13 | WriteBatchHandlerJniCallback::WriteBatchHandlerJniCallback( | |
14 | JNIEnv* env, jobject jWriteBatchHandler) | |
15 | : m_env(env) { | |
16 | ||
17 | // Note: we want to access the Java WriteBatchHandler instance | |
18 | // across multiple method calls, so we create a global ref | |
19 | assert(jWriteBatchHandler != nullptr); | |
20 | m_jWriteBatchHandler = env->NewGlobalRef(jWriteBatchHandler); | |
21 | if(m_jWriteBatchHandler == nullptr) { | |
22 | // exception thrown: OutOfMemoryError | |
23 | return; | |
24 | } | |
25 | ||
26 | m_jPutMethodId = WriteBatchHandlerJni::getPutMethodId(env); | |
27 | if(m_jPutMethodId == nullptr) { | |
28 | // exception thrown | |
29 | return; | |
30 | } | |
31 | ||
32 | m_jMergeMethodId = WriteBatchHandlerJni::getMergeMethodId(env); | |
33 | if(m_jMergeMethodId == nullptr) { | |
34 | // exception thrown | |
35 | return; | |
36 | } | |
37 | ||
38 | m_jDeleteMethodId = WriteBatchHandlerJni::getDeleteMethodId(env); | |
39 | if(m_jDeleteMethodId == nullptr) { | |
40 | // exception thrown | |
41 | return; | |
42 | } | |
43 | ||
44 | m_jDeleteRangeMethodId = WriteBatchHandlerJni::getDeleteRangeMethodId(env); | |
45 | if (m_jDeleteRangeMethodId == nullptr) { | |
46 | // exception thrown | |
47 | return; | |
48 | } | |
49 | ||
50 | m_jLogDataMethodId = WriteBatchHandlerJni::getLogDataMethodId(env); | |
51 | if(m_jLogDataMethodId == nullptr) { | |
52 | // exception thrown | |
53 | return; | |
54 | } | |
55 | ||
56 | m_jContinueMethodId = WriteBatchHandlerJni::getContinueMethodId(env); | |
57 | if(m_jContinueMethodId == nullptr) { | |
58 | // exception thrown | |
59 | return; | |
60 | } | |
61 | } | |
62 | ||
63 | void WriteBatchHandlerJniCallback::Put(const Slice& key, const Slice& value) { | |
64 | const jbyteArray j_key = sliceToJArray(key); | |
65 | if(j_key == nullptr) { | |
66 | // exception thrown | |
67 | if(m_env->ExceptionCheck()) { | |
68 | m_env->ExceptionDescribe(); | |
69 | } | |
70 | return; | |
71 | } | |
72 | ||
73 | const jbyteArray j_value = sliceToJArray(value); | |
74 | if(j_value == nullptr) { | |
75 | // exception thrown | |
76 | if(m_env->ExceptionCheck()) { | |
77 | m_env->ExceptionDescribe(); | |
78 | } | |
79 | if(j_key != nullptr) { | |
80 | m_env->DeleteLocalRef(j_key); | |
81 | } | |
82 | return; | |
83 | } | |
84 | ||
85 | m_env->CallVoidMethod( | |
86 | m_jWriteBatchHandler, | |
87 | m_jPutMethodId, | |
88 | j_key, | |
89 | j_value); | |
90 | if(m_env->ExceptionCheck()) { | |
91 | // exception thrown | |
92 | m_env->ExceptionDescribe(); | |
93 | if(j_value != nullptr) { | |
94 | m_env->DeleteLocalRef(j_value); | |
95 | } | |
96 | if(j_key != nullptr) { | |
97 | m_env->DeleteLocalRef(j_key); | |
98 | } | |
99 | return; | |
100 | } | |
101 | ||
102 | if(j_value != nullptr) { | |
103 | m_env->DeleteLocalRef(j_value); | |
104 | } | |
105 | if(j_key != nullptr) { | |
106 | m_env->DeleteLocalRef(j_key); | |
107 | } | |
108 | } | |
109 | ||
110 | void WriteBatchHandlerJniCallback::Merge(const Slice& key, const Slice& value) { | |
111 | const jbyteArray j_key = sliceToJArray(key); | |
112 | if(j_key == nullptr) { | |
113 | // exception thrown | |
114 | if(m_env->ExceptionCheck()) { | |
115 | m_env->ExceptionDescribe(); | |
116 | } | |
117 | return; | |
118 | } | |
119 | ||
120 | const jbyteArray j_value = sliceToJArray(value); | |
121 | if(j_value == nullptr) { | |
122 | // exception thrown | |
123 | if(m_env->ExceptionCheck()) { | |
124 | m_env->ExceptionDescribe(); | |
125 | } | |
126 | if(j_key != nullptr) { | |
127 | m_env->DeleteLocalRef(j_key); | |
128 | } | |
129 | return; | |
130 | } | |
131 | ||
132 | m_env->CallVoidMethod( | |
133 | m_jWriteBatchHandler, | |
134 | m_jMergeMethodId, | |
135 | j_key, | |
136 | j_value); | |
137 | if(m_env->ExceptionCheck()) { | |
138 | // exception thrown | |
139 | m_env->ExceptionDescribe(); | |
140 | if(j_value != nullptr) { | |
141 | m_env->DeleteLocalRef(j_value); | |
142 | } | |
143 | if(j_key != nullptr) { | |
144 | m_env->DeleteLocalRef(j_key); | |
145 | } | |
146 | return; | |
147 | } | |
148 | ||
149 | if(j_value != nullptr) { | |
150 | m_env->DeleteLocalRef(j_value); | |
151 | } | |
152 | if(j_key != nullptr) { | |
153 | m_env->DeleteLocalRef(j_key); | |
154 | } | |
155 | } | |
156 | ||
157 | void WriteBatchHandlerJniCallback::Delete(const Slice& key) { | |
158 | const jbyteArray j_key = sliceToJArray(key); | |
159 | if(j_key == nullptr) { | |
160 | // exception thrown | |
161 | if(m_env->ExceptionCheck()) { | |
162 | m_env->ExceptionDescribe(); | |
163 | } | |
164 | return; | |
165 | } | |
166 | ||
167 | m_env->CallVoidMethod( | |
168 | m_jWriteBatchHandler, | |
169 | m_jDeleteMethodId, | |
170 | j_key); | |
171 | if(m_env->ExceptionCheck()) { | |
172 | // exception thrown | |
173 | m_env->ExceptionDescribe(); | |
174 | if(j_key != nullptr) { | |
175 | m_env->DeleteLocalRef(j_key); | |
176 | } | |
177 | return; | |
178 | } | |
179 | ||
180 | if(j_key != nullptr) { | |
181 | m_env->DeleteLocalRef(j_key); | |
182 | } | |
183 | } | |
184 | ||
185 | void WriteBatchHandlerJniCallback::DeleteRange(const Slice& beginKey, | |
186 | const Slice& endKey) { | |
187 | const jbyteArray j_beginKey = sliceToJArray(beginKey); | |
188 | if (j_beginKey == nullptr) { | |
189 | // exception thrown | |
190 | if (m_env->ExceptionCheck()) { | |
191 | m_env->ExceptionDescribe(); | |
192 | } | |
193 | return; | |
194 | } | |
195 | ||
196 | const jbyteArray j_endKey = sliceToJArray(beginKey); | |
197 | if (j_endKey == nullptr) { | |
198 | // exception thrown | |
199 | if (m_env->ExceptionCheck()) { | |
200 | m_env->ExceptionDescribe(); | |
201 | } | |
202 | return; | |
203 | } | |
204 | ||
205 | m_env->CallVoidMethod(m_jWriteBatchHandler, m_jDeleteRangeMethodId, | |
206 | j_beginKey, j_endKey); | |
207 | if (m_env->ExceptionCheck()) { | |
208 | // exception thrown | |
209 | m_env->ExceptionDescribe(); | |
210 | if (j_beginKey != nullptr) { | |
211 | m_env->DeleteLocalRef(j_beginKey); | |
212 | } | |
213 | if (j_endKey != nullptr) { | |
214 | m_env->DeleteLocalRef(j_endKey); | |
215 | } | |
216 | return; | |
217 | } | |
218 | ||
219 | if (j_beginKey != nullptr) { | |
220 | m_env->DeleteLocalRef(j_beginKey); | |
221 | } | |
222 | ||
223 | if (j_endKey != nullptr) { | |
224 | m_env->DeleteLocalRef(j_endKey); | |
225 | } | |
226 | } | |
227 | ||
228 | void WriteBatchHandlerJniCallback::LogData(const Slice& blob) { | |
229 | const jbyteArray j_blob = sliceToJArray(blob); | |
230 | if(j_blob == nullptr) { | |
231 | // exception thrown | |
232 | if(m_env->ExceptionCheck()) { | |
233 | m_env->ExceptionDescribe(); | |
234 | } | |
235 | return; | |
236 | } | |
237 | ||
238 | m_env->CallVoidMethod( | |
239 | m_jWriteBatchHandler, | |
240 | m_jLogDataMethodId, | |
241 | j_blob); | |
242 | if(m_env->ExceptionCheck()) { | |
243 | // exception thrown | |
244 | m_env->ExceptionDescribe(); | |
245 | if(j_blob != nullptr) { | |
246 | m_env->DeleteLocalRef(j_blob); | |
247 | } | |
248 | return; | |
249 | } | |
250 | ||
251 | if(j_blob != nullptr) { | |
252 | m_env->DeleteLocalRef(j_blob); | |
253 | } | |
254 | } | |
255 | ||
256 | bool WriteBatchHandlerJniCallback::Continue() { | |
257 | jboolean jContinue = m_env->CallBooleanMethod( | |
258 | m_jWriteBatchHandler, | |
259 | m_jContinueMethodId); | |
260 | if(m_env->ExceptionCheck()) { | |
261 | // exception thrown | |
262 | m_env->ExceptionDescribe(); | |
263 | } | |
264 | ||
265 | return static_cast<bool>(jContinue == JNI_TRUE); | |
266 | } | |
267 | ||
268 | /* | |
269 | * Creates a Java Byte Array from the data in a Slice | |
270 | * | |
271 | * When calling this function | |
272 | * you must remember to call env->DeleteLocalRef | |
273 | * on the result after you have finished with it | |
274 | * | |
275 | * @param s A Slice to convery to a Java byte array | |
276 | * | |
277 | * @return A reference to a Java byte array, or a nullptr if an | |
278 | * exception occurs | |
279 | */ | |
280 | jbyteArray WriteBatchHandlerJniCallback::sliceToJArray(const Slice& s) { | |
281 | jbyteArray ja = m_env->NewByteArray(static_cast<jsize>(s.size())); | |
282 | if(ja == nullptr) { | |
283 | // exception thrown: OutOfMemoryError | |
284 | return nullptr; | |
285 | } | |
286 | ||
287 | m_env->SetByteArrayRegion( | |
288 | ja, 0, static_cast<jsize>(s.size()), | |
289 | const_cast<jbyte*>(reinterpret_cast<const jbyte*>(s.data()))); | |
290 | if(m_env->ExceptionCheck()) { | |
291 | if(ja != nullptr) { | |
292 | m_env->DeleteLocalRef(ja); | |
293 | } | |
294 | // exception thrown: ArrayIndexOutOfBoundsException | |
295 | return nullptr; | |
296 | } | |
297 | ||
298 | return ja; | |
299 | } | |
300 | ||
301 | WriteBatchHandlerJniCallback::~WriteBatchHandlerJniCallback() { | |
302 | if(m_jWriteBatchHandler != nullptr) { | |
303 | m_env->DeleteGlobalRef(m_jWriteBatchHandler); | |
304 | } | |
305 | } | |
306 | } // namespace rocksdb |