Configuration

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Configuration
This is the manual for older MicroStream versions (Version < 5.0).
The new documentation (Version >= 5.0) is located at:
​https://docs.microstream.one/​
The EmbeddedStorageManager is mostly created with factory methods of EmbeddedStorage, where the most common settings, like database directory or the root instance, can be configured.
EmbeddedStorageManager storageManager = EmbeddedStorage.start(
    myRoot,                 // root object of entity graph
    Paths.get("data-dir")    // storage data directory
);
Foundations
To achieve a more detailed customization, you can utilize the EmbeddedStorageFoundation factory type. It holds and creates on demand all the parts that form an EmbeddedStorageManager.
NioFileSystem          fileSystem     = NioFileSystem.New();
EmbeddedStorageManager storageManager = EmbeddedStorageFoundation.New()
    .setConfiguration(
        StorageConfiguration.Builder()
          .setStorageFileProvider(
        		    Storage.FileProviderBuilder(fileSystem)
        			    .setDirectory(fileSystem.ensureDirectoryPath("storageDir"))
        			    .createFileProvider()
        	)
          .setChannelCountProvider(StorageChannelCountProvider.New(4))
          .setBackupSetup(StorageBackupSetup.New(
              fileSystem.ensureDirectoryPath("backupDir")
          ))
          .createConfiguration()
    )
    .createEmbeddedStorageManager();
External Configuration
The artifact storage.embedded.configuration provides a convenience layer for configuration purposes, as well as facilities to read external configuration. 
pom.xml
<repositories>
    <repository>
        <id>microstream-releases</id>
        <url>https://repo.microstream.one/repository/maven-public/</url>
    </repository>
</repositories>
<dependencies>
    <dependency>
        <groupId>one.microstream</groupId>
        <artifactId>storage.embedded.configuration</artifactId>
        <version>04.01.00-MS-GA</version>
    </dependency>
</dependencies>
The Configuration type consolidates the most widely used parameters from the storage foundations in one place. It's output is an EmbeddedStorageFoundation from which a EmbeddedStorageManager can be created.
EmbeddedStorageManager storageManager = Configuration.Default()
    .setBaseDirectoryInUserHome("data-dir")
    .setBackupDirectory("backup-dir")
    .setChannelCount(4)
    .createEmbeddedStorageFoundation()
    .createEmbeddedStorageManager();
To read an external configuration use ConfigurationLoader and ConfigurationParser or the Load*() methods of Configuration. Currently XML and INI files are supported.
java (xml)
xml
java (ini)
ini
Configuration configuration = Configuration.LoadXml(
    HelloWorld.class.getResource("/META-INF/microstream/storage.xml")
);
<?xml version="1.0" encoding="UTF-8"?>
<properties>
    <property name="baseDirectory" value ="data" />
    <property name="channelCount" value ="4" />
</properties>
Configuration configuration = Configuration.LoadIni(
    HelloWorld.class.getResource("/META-INF/microstream/storage.ini")
);
baseDirectory = data
channelCount = 4
If you just use Configuration.Load() the default configuration file is used, which is either a file in the classpath root named microstream-storage.properties, or the path configured via the system property microstream.storage.configuration.path.
The full example can be found on GitHub.
If you use a different format, e.g. Json, just implement the ConfigurationParser in the likes of XmlConfigurationParser or IniConfigurationParser.
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Root Instances
Properties
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