有没有简单的方法从旧版 java MongoClient 中提取连接字符串

Question

Is there easy way (or a library) that would extract mongo connection string from legacy com.mongodb.MongoClient object?

I know that I could extract all that information from MongoClient and build the connection URI myself, but it seems to be error prone.

If there's way to create com.mongodb.client.MongoClient instance from com.mongodb.MongoClient then it would good solution for my problem as well.

Answer 1

As D.SM has mentioned in the comment, it's better to create new MongoClient from legacy client instead of creating it from connection string, because not all client options have corresponding URI options. So far I came with:

    private com.mongodb.client.MongoClient fromLegacyClient(MongoClient legacyMongoClient) {
        MongoClientOptions mongoClientOptions = legacyMongoClient.getMongoClientOptions();
        MongoClientSettings.Builder mongoClientSettingsBuilder = MongoClientSettings.builder()
                .readPreference(legacyMongoClient.getReadPreference())
                .writeConcern(legacyMongoClient.getWriteConcern())
                .retryWrites(mongoClientOptions.getRetryWrites())
                .readConcern(legacyMongoClient.getReadConcern())
                .codecRegistry(mongoClientOptions.getCodecRegistry())
                .compressorList(mongoClientOptions.getCompressorList())
                .applicationName(mongoClientOptions.getApplicationName())
                .commandListenerList(mongoClientOptions.getCommandListeners())
                .codecRegistry(mongoClientOptions.getCodecRegistry())
                .applyToClusterSettings(clusterSettings -> {
                    clusterSettings.hosts(legacyMongoClient.getAllAddress());
                    clusterSettings.localThreshold(mongoClientOptions.getLocalThreshold(), MILLISECONDS);
                    clusterSettings.serverSelectionTimeout(mongoClientOptions.getServerSelectionTimeout(), MILLISECONDS);
                    clusterSettings.serverSelector(mongoClientOptions.getServerSelector());
                    clusterSettings.requiredReplicaSetName(mongoClientOptions.getRequiredReplicaSetName());
                    mongoClientOptions.getClusterListeners().forEach(clusterSettings::addClusterListener);
                })
                .applyToConnectionPoolSettings(connectionPoolSettings -> {
                    mongoClientOptions.getConnectionPoolListeners().forEach(connectionPoolSettings::addConnectionPoolListener);
                    connectionPoolSettings.maxConnectionIdleTime(mongoClientOptions.getMaxConnectionIdleTime(), MILLISECONDS);
                    connectionPoolSettings.maxConnectionLifeTime(mongoClientOptions.getMaxConnectionLifeTime(), MILLISECONDS);
                    connectionPoolSettings.maxWaitTime(mongoClientOptions.getMaxWaitTime(), MILLISECONDS);
                })
                .applyToSocketSettings(socketSettings -> {
                    socketSettings.connectTimeout(mongoClientOptions.getConnectTimeout(), MILLISECONDS);
                    socketSettings.readTimeout(mongoClientOptions.getSocketTimeout(), MILLISECONDS);
                })
                .applyToServerSettings(serverSettings -> {
                    mongoClientOptions.getServerListeners().forEach(serverSettings::addServerListener);
                    serverSettings.minHeartbeatFrequency(mongoClientOptions.getMinHeartbeatFrequency(), MILLISECONDS);
                    serverSettings.heartbeatFrequency(mongoClientOptions.getHeartbeatFrequency(), MILLISECONDS);

                })
                .applyToSslSettings(sslSettings -> {
                    sslSettings.enabled(mongoClientOptions.isSslEnabled());
                    sslSettings.invalidHostNameAllowed(mongoClientOptions.isSslInvalidHostNameAllowed());
                    sslSettings.context(mongoClientOptions.getSslContext());
                });
        if (legacyMongoClient.getCredential() != null) {
            mongoClientSettingsBuilder.credential(legacyMongoClient.getCredential());
        }
        return MongoClients.create(mongoClientSettingsBuilder.build());
    }