{info} DB Web Services provide methods for storing and searching chemical structures in a persistent database, currently in MapDB. MapDB works with collections, but in this documentation the terminology table is used instead of collection. There are methods provided for:
- creating / deleting tables
- inserting / deleting / modifying structures and data in the tables
- executing duplicate, substructure, full fragment and similarity searches
This documentation describes installation, administration and usage of DB Web Services.
DB Web Services application is available in two modes:
In microservices system mode the DB Web Service runs together with Config service, Discovery service and Gateway service. These three services are mandatory and optionally other services can also be part of the system. All configuration must be done in the Config module.
The default configuration applies to the microservices system mode.
The web application runs on host <server-host> and listens on port <gateway-server-port>.
In standalone web application mode the DB Web Service runs alone, without the Config service, Discovery service and Gateway service (however the installer installs them, as well).
The default configuration must be changed according to the standalone web application mode; set
eureka.client.enabled=false in application.properties file, and
spring.cloud.config.failFast=false ,
spring.cloud.config.enabled=false and
spring.cloud.config.uri= (so to empty) in bootstrap.properties file.
All configuration must be done in the DB module.
The web application runs on host <server-host> and listens on port <server-port>.
See here.
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See here.
Module is installed into folder: jws/jws-db
See here.
Additionally, the IUPAC naming plugin license is required for the usage of name file format.
Default configuration:
| application.properties | description |
|---|---|
| server.port=8062 | |
| logging.file.name=../logs/jws-db.log | |
| eureka.client.enabled=true | set eureka.client.enabled=false to switch to standalone DB Web Services application mode |
| initOnStart=AUTO | initOnStart can be:INIT: the existing database is deleted, and a new empty one is createdAUTO: existing database is started, in case of non-existing database a new empty one is createdOPEN: existing database is started, in case of non-existing database error is thrownOPEN_OR_INIT_ONLY: if OPEN is unsuccessful, then only an INIT step happens, however the service is not run |
| updateMode=EXIT | updateMode gets in action only if the version number has changed updateMode can be EXIT: exit if version mode has changedDROP: drop old data if version mode has changedREINDEX: keep old data and reindex them in order to work with new version |
| search.wallTimeLimitSeconds=3600 | |
| com.chemaxon.zetor.settings.scheme=${CXN_SCHEME:GCRDB} com.chemaxon.zetor.settings.indexDir=${CXN_STRUCTURE_DATA_DIR:./data/chemical-data/store} com.chemaxon.zetor.settings.gcrdb.isSingleTable=${CXN_DB_LOGIC_SINGLE_TABLE:true} com.chemaxon.zetor.settings.gcrdb.singleTableName=${CXN_DB_TABLE_NAME:engine_data} com.chemaxon.zetor.settings.gcrdb.sqlBuilderProvider=${CXN_DB_DIALECT:H2} com.chemaxon.zetor.settings.gcrdb.jdbcUrl=${CXN_DB_JDBC_URL:jdbc:h2:nio:${com.chemaxon.zetor.settings.indexDir}/db;COMPRESS=true} com.chemaxon.zetor.settings.gcrdb.user=${CXN_DB_JDBC_USER:user} com.chemaxon.zetor.settings.gcrdb.password=${CXN_DB_JDBC_PASSWORD:password} com.chemaxon.zetor.settings.gcrdb.allowBatchUpdates=${CXN_DB_LOGIC_BATCH_UPDATE:true} com.chemaxon.zetor.settings.forcePurge=true |
|
| com.chemaxon.webservices.db.import_export.dir=${CXN_DB_IMPORT_EXPORT_DIR:data/export} com.chemaxon.webservices.db.import_export.importBatchSize=${CXN_DB_IMPORT_EXPORT_BATCH_SIZE:5000} |
|
| com.chemaxon.zetor.types[0].version = 1 com.chemaxon.zetor.types[0].typeName = sample com.chemaxon.zetor.types[0].typeId = 1 com.chemaxon.zetor.types[0].tautomerHandlingMode = OFF com.chemaxon.zetor.types[0].stereoAssumption=ABSOLUTE com.chemaxon.zetor.types[0].standardizerConfig = aromatize com.chemaxon.zetor.types[1].version = 1 com.chemaxon.zetor.types[1].typeName = taumol com.chemaxon.zetor.types[1].typeId = 2 com.chemaxon.zetor.types[1].tautomerHandlingMode = GENERIC com.chemaxon.zetor.types[1].stereoAssumption=ABSOLUTE com.chemaxon.zetor.types[1].standardizerConfig = aromatize |
Here are the molecule types defined. You can delete, modify or add new molecules types. version must be 1typeName must be uniquetypeID must be unique integer tautomerHandlingMode can be OFF or GENERIC or CANONIC_GENERIC_HYBRID (available from version 20.10)stereoAssumption can be ABSOLUTE or RELATIVE (available from version 20.12)standardizerConfig can be made of action strings or the content of a standardizer configuration xml file standardizerConfig=aromatize:b..removeExplicitHImportant: Indexing of the types array must always be sequential 0, 1, 2, ... All changes take effect only if initOnStart is set to INIT, and the application is re-started. Take care, the existing database will be deleted. |
Performance tuning can be executed by doing some cache related settings. Please use our JChem Engines cache and memory calculator page (take into account that superstructure search is not available) to calculate the appropriate settings.
All properties calculated by the calculator must be copied into the application.properties file (not into the file specified on the calculator page) like:
com.chemaxon.zetor.settings.label.cachePolicy=DISABLED
com.chemaxon.zetor.settings.label.cachedObjectCount=0
com.chemaxon.zetor.settings.molecule.cachePolicy=DISABLED
com.chemaxon.zetor.settings.molecule.cachedObjectCount=0
com.chemaxon.zetor.settings.fingerprint.cachedObjectCount=1320000The infix *.runtime* in keys was used in version 19.10 and earlier:
com.chemaxon.zetor.settings.runtime.label.cachePolicy=DISABLED
com.chemaxon.zetor.settings.runtime.label.cachedObjectCount=0
com.chemaxon.zetor.settings.runtime.molecule.cachePolicy=DISABLED
com.chemaxon.zetor.settings.runtime.molecule.cachedObjectCount=0
com.chemaxon.zetor.settings.runtime.fingerprint.cachedObjectCount=1320000| bootstrap.properties |
|---|
| spring.cloud.config.failFast=true spring.cloud.config.uri=${CONFIG_SERVER_URI:http\://localhost\:8888/} spring.cloud.config.retry.initialInterval=3000 spring.cloud.config.retry.multiplier=1.2 spring.cloud.config.retry.maxInterval=60000 spring.cloud.config.retry.maxAttempts=100 |
For more settings possibilities see spring documentation page.
Search logging
Debug level of search logging can be set in the files configuring the JVM options:
jws-db-service.vmoptions run-jws-db.vmoptions
by adding line
-Djchem.debug=true
or setting
logging.level.com.chemaxon.jchem=DEBUGin application.properties file.
HA and load balancing is provided for DB Web Services, for the only stateful web service in JChem Microservices.
Running more instances of the db service ensures HA and load balancing.
In HA mode, Hazelcast is used for distributed caching of the data.
It can be optionally set that all nodes present in the system have their own cache ('Near' cache). By default, near cache is switched on.
Features when near cache is switched on:
quicker structure search
increased memory usage
in the case of data update, the system eventually becomes inconsistent; it can take a few seconds to get back again consistent.
HA mode needs PostgreSQL database installed, user and database created
HA mode must be configure in /jws-config/common-config/application.properties file
Example configuration:
| /jws-config/common-config/application.properties |
|---|
| com.chemaxon.zetor.settings.indexDir=data/chemical-data/store com.chemaxon.zetor.settings.scheme=crdb com.chemaxon.zetor.settings.forcePurge=true com.chemaxon.zetor.settings.crdb.sqlBuilderProvider=POSTGRESQL com.chemaxon.zetor.settings.crdb.jdbcUrl=jdbc:postgresql://localhost:5432/zetor com.chemaxon.zetor.settings.crdb.user=chemaxon com.chemaxon.zetor.settings.crdb.password=chemaxon com.chemaxon.zetor.additional.scheme=crdb com.chemaxon.zetor.additional.indexDir=data/extra-data/ com.chemaxon.zetor.additional.crdb.sqlBuilderProvider=POSTGRESQL com.chemaxon.zetor.additional.crdb.jdbcUrl=jdbc:postgresql://localhost:5432/zetor com.chemaxon.zetor.additional.crdb.user=chemaxon com.chemaxon.zetor.additional.crdb.password=chemaxon |
Here you find a load balanced example application on GitHub.
Prerequisites in case of microservices system mode:
Run the service in command line in folder jws/jws-db/ :
jws-db-service --start (on Windows)
jws-db-service start (on Linux)
or
run-jws-db.exe (on Windows)
run-jws-db (on Linux)
Find and try out the API on the Swagger UI.
| Mode | URL of Swagger UI | default URL of Swagger UI |
|---|---|---|
| microservices system | <serverhost>:<gateway-port>/jwsdb/API/ | localhost:8080/jwsdb/API/ |
| standalone web application mode | <serverhost>:<server-port>/API/ | localhost:8062/API/ |
For detailed description check out the JWS DB demo site:
https://jchem-microservices.chemaxon.com/jwsdb/api/index.html
The guidelines, examples on the Demo site or on the Swagger UI API documentation of your installed module display the methods and syntax implemented for reaching the essential chemical searching functionalities of JChem Base.
DB Web Services provides method for getting the available molecule types.
Every table has a Molecule type: this is a descriptor that is used by the search engine. It contains information about how structures are handled during search. The application has two very simple built in types called: sample (search with aromatization) and taumol (tautomer search). See the type definitions in the application.properties file.
Table operations
Structure Insert/Delete methods
Duplicate search methods
Substructure search methods
Similarity search methods
{primary} Timeout From version 19.25 the default timeout ( hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds ) is taken into account during indexing. If an indexing job is started already and timeout occurs, then in the background the indexing continues. and the user is informed in the message of the error response about it: "this process has started already will finish in the background" . If the process was only waiting for other indexing processes to finish, then "this process was cancelled" message appears in the error message. The default timeout is 25000 milliseconds. We stop the process slightly before the end of the timeout (default: 300 milliseconds, can be set with zetor.indexing.timeoutDifferenceInMilliseconds property) so we have a chance to provide the answer correctly.
The data apparently stored in tables (collections) are stored in the file system under jws-db/data/ folder. The content of that folder must be stored as backup. Furthermore, the application.properties file(s) also should be saved.
It is possible to use S3 buckets to import / export database tables. For this we use Spring AWS support. Our default settings are different than Spring's defaults so users who are not using this feature can run their services without AWS issues. The current constants are the following:
cloud
aws
region
auto: false
static: eu-central-1
stack
auto: falsecloud.aws.region.auto is responsible to decide if region should be discovered automatically, or not. If you are running inside AWS infrastructure you want to set this to true.
cloud.aws.region.static must be set if can not be determined automatically (the previous setting is responsible for that). Spring's default is us-west-1.
cloud.aws.stack.auto is responsible to find AWS stack services automatically by reading standard AWS resources. If you are running your instances on AWS you want to to enable this feature by setting to true.
Please be aware the following settings are not using Spring Relaxed Binding rules, they must be set exactly like this from properties/yaml file:
cloud.aws.credentials.useDefaultAwsCredentialsChain=true if you want to use the default AWS chain to discover your credentials. The default chain is searching the following sources in this exact order (and uses the first hit):If you are using any other method to determine the credentials, this should be switched to false, which is the default value.
cloud.aws.credentials.accessKey and cloud.aws.credentials.secretKey to manually set a static access key and secret key value.cloud.aws.credentials.profilePath to specify your custom profile path URL and use cloud.aws.credentials.profileName to use a different profile from AWS credentials file.You can setup S3 import/export the following settings:
# Specifies whether use FILE based import/export or S3 based import/export. Default is: `FILE`
com.chemaxon.webservices.db.import_export.dbExportStrategy=S3
# Specifies which S3 bucket to use. Default value: s3://export-bucket/ . The URL should follow the S3 URL scheme, like in the default value.
com.chemaxon.webservices.db.import_export.s3BuckeBasetUrl=s3://export-bucket/When running DB Web Services on AWS Fargate, it is recommended to use a persistent data storage (e.g. Amazon RDS) and if upgrading in REINDEX mode, the export/import strategy should be set to S3:
# Specifies whether use FILE based import/export or S3 based import/export. Default is: FILE
com.chemaxon.webservices.db.import_export.dbExportStrategy=S3
# Specifies which S3 bucket to use. Default value: s3://export-bucket/ . The URL should follow the S3 URL scheme, like in the default value.
com.chemaxon.webservices.db.import_export.s3BuckeBasetUrl=s3://export-bucket/Because in REINDEX mode the service reimports the tables at startup, the timeout and startPeriod of the AWS Fargate service should be set accordingly so it would give enough time for the reimport. (AWS API Reference - ECS HealthCheck)
The above import/export settings for S3 should also be set if using /rest-v1/db/additional/{tableName}/importFromFile/{fileName} and /rest-v1/db/additional/{tableName}/exportToFile endpoints on AWS Fargate.
DB Web Services use a backend where index data is stored through a JDBC connection. As default this JDBC connection is a file based H2 connection. On AWS Fargate systems persisting data on the file system of the AWS Fargate container is not advised as after deleting the container data gets lost. Therefore we suggest using a database outside the AWS Fargate container.
An example for setting a PostgreSQL Amazon RDS instance:
com.chemaxon.zetor.settings.gcrdb.sqlBuilderProvider=POSTGRESQL
com.chemaxon.zetor.settings.gcrdb.jdbcUrl=jdbc:postgresql://<URL_OF_DB>:<PORT>/<DB_NAME>
com.chemaxon.zetor.settings.gcrdb.user=<USER>
com.chemaxon.zetor.settings.gcrdb.password=<PASSWORD>