Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
BatchedAsyncMongoCollection |
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| 1.0;1 |
1 | /* | |
2 | * #%L | |
3 | * BatchedAsyncMongoCollection.java - mongodb-async-driver - Allanbank Consulting, Inc. | |
4 | * %% | |
5 | * Copyright (C) 2011 - 2014 Allanbank Consulting, Inc. | |
6 | * %% | |
7 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
8 | * you may not use this file except in compliance with the License. | |
9 | * You may obtain a copy of the License at | |
10 | * | |
11 | * http://www.apache.org/licenses/LICENSE-2.0 | |
12 | * | |
13 | * Unless required by applicable law or agreed to in writing, software | |
14 | * distributed under the License is distributed on an "AS IS" BASIS, | |
15 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
16 | * See the License for the specific language governing permissions and | |
17 | * limitations under the License. | |
18 | * #L% | |
19 | */ | |
20 | package com.allanbank.mongodb; | |
21 | ||
22 | import java.io.Closeable; | |
23 | ||
24 | import com.allanbank.mongodb.builder.BatchedWriteMode; | |
25 | ||
26 | /** | |
27 | * BatchedAsyncMongoCollection provides the interface for submitting batched | |
28 | * requests to the MongoDB server. The behavior of the batching is different | |
29 | * based on the lowest version member of the MongoDB cluster. | |
30 | * | |
31 | * <h4>Pre MongoDB 2.6</h4> | |
32 | * <p> | |
33 | * For MongoDB servers prior to 2.6 each command is sent to the server exactly | |
34 | * as it would have been using the non-batched interface except that the | |
35 | * commands are sent using a single logical connection. Queries using different, | |
36 | * non-primary, {@link ReadPreference}s may use different physical connections. | |
37 | * </p> | |
38 | * | |
39 | * <h4>Post MongoDB 2.6</h4> | |
40 | * <p> | |
41 | * With the introduction of commands to batch inserts, updates and deletes we | |
42 | * can now group each sequence of inserts, updates, and deletes within the | |
43 | * batch. The actual logic for what writes can be grouped together is controlled | |
44 | * by the {@link #setMode(BatchedWriteMode) mode}. Users should be sure that | |
45 | * they have read and understand the {@link #setMode(BatchedWriteMode)} JavaDoc. | |
46 | * Similar to the pre-2.6 case all of the operations are sent using a single | |
47 | * logical connection. Queries using different, non-primary, | |
48 | * {@link ReadPreference}s may use different physical connections. | |
49 | * </p> | |
50 | * <p> | |
51 | * <b>Warning</b>: In the case of | |
52 | * {@link BatchedWriteMode#SERIALIZE_AND_CONTINUE} and | |
53 | * {@link BatchedWriteMode#REORDERED} it is impossible to determine the number | |
54 | * of documents each update and/or delete touched. In these cases each update in | |
55 | * the batch will be returned the number of documents touched by the batch as a | |
56 | * whole. For this reason the batching of updates and deletes is disabled. It | |
57 | * can be enabled by setting {@link #setBatchUpdates(boolean)} and | |
58 | * {@link #setBatchDeletes(boolean)} to true. We have written a bug report (<a | |
59 | * href="https://jira.mongodb.org/browse/SERVER-12858">SERVER-12858</a>) to have | |
60 | * the additional information added to the responses so we can remove this | |
61 | * restriction. | |
62 | * </p> | |
63 | * | |
64 | * @api.yes This interface is part of the driver's API. Public and protected | |
65 | * members will be deprecated for at least 1 non-bugfix release | |
66 | * (version numbers are <major>.<minor>.<bugfix>) | |
67 | * before being removed or modified. | |
68 | * @copyright 2014, Allanbank Consulting, Inc., All Rights Reserved | |
69 | * | |
70 | * @see AsyncMongoCollection | |
71 | * @see MongoCollection | |
72 | */ | |
73 | public interface BatchedAsyncMongoCollection extends AsyncMongoCollection, | |
74 | Closeable { | |
75 | /** | |
76 | * Cancels the pending batch of operations without sending them to the | |
77 | * server. | |
78 | * <p> | |
79 | * After canceling the current batch you may continue to accumulate | |
80 | * additional operations to be sent in a different batch. | |
81 | * </p> | |
82 | * | |
83 | * @throws MongoDbException | |
84 | * If there is an error submitting the batched requests. | |
85 | */ | |
86 | public void cancel() throws MongoDbException; | |
87 | ||
88 | /** | |
89 | * Flushes the pending batch and submits all of the pending requests to the | |
90 | * server. | |
91 | * <p> | |
92 | * This method is equivalent to {@link #flush()} and is only provided to | |
93 | * implement the {@link Closeable} interface to support try-with-resource. | |
94 | * </p> | |
95 | * | |
96 | * @throws MongoDbException | |
97 | * If there is an error submitting the batched requests. | |
98 | */ | |
99 | @Override | |
100 | public void close() throws MongoDbException; | |
101 | ||
102 | /** | |
103 | * Flushes the pending batch and submits all of the pending requests to the | |
104 | * server. | |
105 | * <p> | |
106 | * After flushing the current batch you may continue to accumulate | |
107 | * additional operations to be sent in a different batch. | |
108 | * </p> | |
109 | * | |
110 | * @throws MongoDbException | |
111 | * If there is an error submitting the batched requests. | |
112 | */ | |
113 | public void flush() throws MongoDbException; | |
114 | ||
115 | /** | |
116 | * Sets if deletes should be batched. Set to true to batch deletes. | |
117 | * <p> | |
118 | * Defaults to false since there is no way to determine how many documents | |
119 | * each deletes removed when they are batched. | |
120 | * </p> | |
121 | * <p> | |
122 | * This setting takes effect for a batch when it is {@link #close() closed} | |
123 | * or {@link #flush() flushed}. Intermediate changes between flushes have no | |
124 | * effect. | |
125 | * </p> | |
126 | * | |
127 | * @param batchDeletes | |
128 | * Set to true to batch deletes. | |
129 | * @see <a | |
130 | * href="https://jira.mongodb.org/browse/SERVER-12858">SERVER-12858</a> | |
131 | */ | |
132 | public void setBatchDeletes(boolean batchDeletes); | |
133 | ||
134 | /** | |
135 | * Sets if updates should be batched. Set to true to batch updates. | |
136 | * <p> | |
137 | * Defaults to false since there is no way to determine how many documents | |
138 | * each update touched when they are batched. | |
139 | * </p> | |
140 | * <p> | |
141 | * This setting takes effect for a batch when it is {@link #close() closed} | |
142 | * or {@link #flush() flushed}. Intermediate changes between flushes have no | |
143 | * effect. | |
144 | * </p> | |
145 | * | |
146 | * @param batchUpdates | |
147 | * Set to true to batch updates. | |
148 | * @see <a | |
149 | * href="https://jira.mongodb.org/browse/SERVER-12858">SERVER-12858</a> | |
150 | */ | |
151 | public void setBatchUpdates(boolean batchUpdates); | |
152 | ||
153 | /** | |
154 | * Sets the default mode for batching of writes. This is only applicable to | |
155 | * situations where the server supports the MongoDB write command (i.e., | |
156 | * version 2.6 and later). There are two cases where the mode will be | |
157 | * ignored: | |
158 | * <ul> | |
159 | * <li> | |
160 | * All inserts with continueOnError set to true will be executed as distinct | |
161 | * batches.</li> | |
162 | * <li> | |
163 | * Any change in the durability within the sequence of writes will case the | |
164 | * writes to be broken across batches sent to the server. This does not | |
165 | * apply to {@link Durability#ACK} and {@link Durability#NONE} writes and | |
166 | * they may be grouped with other writes. Users should be aware that this | |
167 | * may cause unexpected write concern failures in those cases.</li> | |
168 | * </ul> | |
169 | * <p> | |
170 | * The default mode is {@link BatchedWriteMode#SERIALIZE_AND_CONTINUE}. This | |
171 | * provides reasonable performance while maintaining the expected semantics. | |
172 | * Note that this mode has the effect of coalescing sequences of inserts | |
173 | * (where continueOnError is true), updates and deletes into single | |
174 | * operations. | |
175 | * </p> | |
176 | * <p> | |
177 | * The {@link BatchedWriteMode#SERIALIZE_AND_STOP} will cause each insert, | |
178 | * update, and delete to be sent as independent commands. | |
179 | * </p> | |
180 | * <p> | |
181 | * The {@link BatchedWriteMode#REORDERED} will cause each sequence of | |
182 | * inserts, updates, and deletes without any other command or query to be | |
183 | * groups together, reordered, and executed together. This includes the | |
184 | * reordering writes within a type (one insert before another to better | |
185 | * packet the messages) as well as reordering the writes across types (a | |
186 | * delete before an insert to build larger batches). | |
187 | * </p> | |
188 | * <p> | |
189 | * The mode setting takes effect for a batch when it is {@link #close() | |
190 | * closed} or {@link #flush() flushed}. Intermediate changes between flushes | |
191 | * have no effect. | |
192 | * </p> | |
193 | * <p> | |
194 | * <b>Warning</b>: In the case of | |
195 | * {@link BatchedWriteMode#SERIALIZE_AND_CONTINUE} and | |
196 | * {@link BatchedWriteMode#REORDERED} it is impossible to determine the | |
197 | * number of documents each update and/or delete touched. In these cases | |
198 | * each update in the batch will be returned the number of documents touched | |
199 | * by the batch as a whole. For this reason the batching of updates and | |
200 | * deletes is disabled. It can be enabled by setting | |
201 | * {@link #setBatchUpdates(boolean)} and {@link #setBatchDeletes(boolean)} | |
202 | * to true. We have written a bug report (<a | |
203 | * href="https://jira.mongodb.org/browse/SERVER-12858">SERVER-12858</a>) to | |
204 | * have the additional information added to the responses so we can remove | |
205 | * this restriction. | |
206 | * </p> | |
207 | * | |
208 | * @param mode | |
209 | * The default mode for | |
210 | * @see <a | |
211 | * href="https://jira.mongodb.org/browse/SERVER-12858">SERVER-12858</a> | |
212 | */ | |
213 | public void setMode(BatchedWriteMode mode); | |
214 | } |