-
Notifications
You must be signed in to change notification settings - Fork 3
Expand file tree
/
Copy pathQuickStart.java
More file actions
132 lines (108 loc) · 4.87 KB
/
Copy pathQuickStart.java
File metadata and controls
132 lines (108 loc) · 4.87 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
/*
* Copyright 2015 MongoDB, Inc.
*
* Licensed 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 quickstart;
import com.mongodb.Block;
import com.mongodb.MongoClient;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.FindOneAndUpdateOptions;
import com.mongodb.client.model.ReturnDocument;
import org.bson.Document;
import org.bson.conversions.Bson;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import static com.mongodb.client.model.Filters.eq;
import static java.lang.String.format;
public final class QuickStart {
private static final Bson QUERY = eq("_id", 1);
private static final Map<Integer, String> entry = Collections.synchronizedMap(new LinkedHashMap<Integer, String>());
private static final Map<Integer, String> read = Collections.synchronizedMap(new LinkedHashMap<Integer, String>());
/**
* Run this main method to see the output of this quick example.
*
* ./gradlew quickStart
* ./gradlew quickStart -DfindAndModify=true
*
* @param args takes an optional single argument for the findAndModify
*/
public static void main(final String[] args) {
boolean findAndModify = args.length == 1 && Boolean.parseBoolean(args[0]);
MongoClient mongoClient = new MongoClient();
MongoDatabase mongoDatabase = mongoClient.getDatabase("test");
MongoCollection<Document> mongoCollection = mongoDatabase.getCollection("coll");
System.out.println("== Initialising the collection ==");
mongoCollection.drop();
Document original = Document.parse("{_id: 1, a: 'A_00', b: '00'}");
mongoCollection.insertOne(original);
System.out.println(format("Original document: %s",original.toJson()));
System.out.println(format("Using FindAndModify: %s", findAndModify));
ExecutorService executor = Executors.newFixedThreadPool(100);
for (int i = 0; i < 20; i++) {
Runnable worker = new WorkerThread(i, mongoCollection, findAndModify);
executor.execute(worker);
}
executor.shutdown();
while (!executor.isTerminated()) {
// Busy loop
}
System.out.println("\nThreads incoming order:\n--------------------------");
for (Map.Entry<Integer, String> m : entry.entrySet()) {
System.out.println(format("workerId: %02d | %s", m.getKey(), m.getValue()));
}
System.out.println("\nAfter DB Update- Records status:\n-------------------------------------");
for (Map.Entry<Integer, String> m : read.entrySet()) {
System.out.println(format("workerId: %02d | %s", m.getKey(), m.getValue()));
}
System.out.println("\nFinished");
}
static class WorkerThread implements Runnable {
private final int workerId;
private final MongoCollection<Document> mongoCollection;
private final boolean findAndModify;
WorkerThread(final int id, final MongoCollection<Document> mongoCollection, final boolean findAndModify){
this.workerId = id;
this.mongoCollection = mongoCollection;
this.findAndModify = findAndModify;
}
public void run() {
// search document where _id=1 and update it with new values
Document newDocument = new Document();
int k = workerId % 2;
if(k == 0) {
newDocument.append("a", format("A_%02d", workerId));
} else {
newDocument.append("b", format("%02d", workerId));
}
Document updateObj = new Document("$set", newDocument);
entry.put(workerId, format("%s", format("Updating: %s", updateObj.toJson())));
if (findAndModify) {
Document updated = mongoCollection.findOneAndUpdate(QUERY, updateObj,
new FindOneAndUpdateOptions().returnDocument(ReturnDocument.AFTER));
read.put(workerId, updated.toJson());
} else {
mongoCollection.updateOne(QUERY, updateObj);
mongoCollection.find(QUERY).forEach((Block<Document>) document -> {
read.put(workerId, document.toJson());
});
}
}
}
private QuickStart() {
}
}