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OpenTok Java SDK

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The OpenTok Java SDK lets you generate sessions and tokens for OpenTok applications that run on the JVM. The SDK also includes support for working with OpenTok archives.

Installation

The Maven Central repository helps manage dependencies for JVM based projects. It can be used via several build tools, including Maven and Gradle.

Maven

When you use Maven as your build tool, you can manage dependencies in the pom.xml file:

<dependency>
    <groupId>com.tokbox</groupId>
    <artifactId>opentok-server-sdk</artifactId>
    <version>2.3.2</version>
</dependency>

Gradle

When you use Gradle as your build tool, you can manage dependencies in the build.gradle file:

dependencies {
  compile group: 'com.tokbox', name: 'opentok-server-sdk', version: '2.3.2'
}

Manually:

Download the jar file for the latest release from the Releases page. Include it in the classpath for your own project by using the JDK directly or in your IDE of choice.

Usage

Initializing

Import the required classes in any class where it will be used. Then initialize a com.opentok.OpenTok object with your own API Key and API Secret.

import com.opentok.OpenTok;

// inside a class or method...
int apiKey = 000000; // YOUR API KEY
String apiSecret = "YOUR API SECRET";
OpenTok opentok = new OpenTok(apiKey, apiSecret)

Creating Sessions

To create an OpenTok Session, use the OpenTok instance's createSession(SessionProperties properties) method. The properties parameter is optional and it is used to specify two things:

An instance can be initialized using the com.opentok.SessionProperties.Builder class. The sessionId property of the returned com.opentok.Session instance, which you can read using the getSessionId() method, is useful to get an identifier that can be saved to a persistent store (such as a database).

import com.opentok.MediaMode;
import com.opentok.ArchiveMode;
import com.opentok.Session;
import com.opentok.SessionProperties;

// A session that attempts to stream media directly between clients:
Session session = opentok.createSession();

// A session that uses the OpenTok Media Router (which is required for archiving):
Session session = opentok.createSession(new SessionProperties.Builder()
  .mediaMode(MediaMode.ROUTED)
  .build());

// A Session with a location hint:
Session session = opentok.createSession(new SessionProperties.Builder()
  .location("12.34.56.78")
  .build());

// A session that is automatically archived (it must used the routed media mode)
Session session = opentok.createSession(new SessionProperties.Builder()
  .mediaMode(MediaMode.ROUTED)
  .archiveMode(ArchiveMode.ALWAYS)
  .build());

// Store this sessionId in the database for later use:
String sessionId = session.getSessionId();

Generating Tokens

Once a Session is created, you can start generating Tokens for clients to use when connecting to it. You can generate a token either by calling an com.opentok.OpenTok instance's generateToken(String sessionId, TokenOptions options) method, or by calling a com.opentok.Session instance's generateToken(TokenOptions options) method after creating it. The options parameter is optional and it is used to set the role, expire time, and connection data of the token. An instance can be initialized using the TokenOptions.Builder class.

import com.opentok.TokenOptions;
import com.opentok.Role;

// Generate a token from just a sessionId (fetched from a database)
String token = opentok.generateToken(sessionId);
// Generate a token by calling the method on the Session (returned from createSession)
String token = session.generateToken();

// Set some options in a token
String token = session.generateToken(new TokenOptions.Builder()
  .role(Role.MODERATOR)
  .expireTime((System.currentTimeMillis() / 1000L) + (7 * 24 * 60 * 60)) // in one week
  .data("name=Johnny")
  .build());

Working with Archives

You can only archive sessions that use the OpenTok Media Router (sessions with the media mode set to routed).

You can start the recording of an OpenTok Session using a com.opentok.OpenTok instance's startArchive(String sessionId, String name) method. This will return a com.opentok.Archive instance. The parameter name is optional and used to assign a name for the Archive. Note that you can only start an Archive on a Session that has clients connected.

import com.opentok.Archive;

// A simple Archive (without a name)
Archive archive = opentok.startArchive(sessionId, null);

// Store this archiveId in the database for later use
String archiveId = archive.getId();

You can also disable audio or video recording by calling the hasAudio(false) or hasVideo(false) methods of an ArchiveProperties builder, and passing the built object into the OpenTok.startArchive(String sessionId, ArchiveProperties properties) method:

import com.opentok.Archive;
import com.opentok.ArchiveProperties;

// Start an audio-only archive
Archive archive = opentok.startArchive(sessionId, new ArchiveProperties.Builder()
  .hasVideo(false)
  .build()););

// Store this archiveId in the database for later use
String archiveId = archive.getId();

Setting the output mode to Archive.OutputMode.INDIVIDUAL setting causes each stream in the archive to be recorded to its own individual file:

import com.opentok.Archive;
import com.opentok.ArchiveProperties;

Archive archive = opentok.startArchive(sessionId, new ArchiveProperties.Builder()
  .archiveMode(Archive.OutputMode.INDIVIDUAL)
  .build()););

// Store this archiveId in the database for later use
String archiveId = archive.getId();

The Archive.OutputMode.COMPOSED setting (the default) causes all streams in the archive to be recorded to a single (composed) file.

You can stop the recording of a started Archive using a com.opentok.Archive instance's stopArchive(String archiveId) method.

// Stop an Archive from an archiveId (fetched from database)
Archive archive = opentok.stopArchive(archiveId);

To get an com.opentok.Archive instance (and all the information about it) from an archiveId, use a com.opentok.OpenTok instance's getArchive(String archiveId) method.

Archive archive = opentok.getArchive(String archiveId);

To delete an Archive, you can call a com.opentok.OpenTok instance's deleteArchive(String archiveId) method.

// Delete an Archive from an archiveId (fetched from database)
opentok.deleteArchive(archiveId);

You can also get a list of all the Archives you've created (up to 1000) with your API Key. This is done using a com.opentok.OpenTok instance's listArchives(int offset, int count) method. You may optionally paginate the Archives you receive using the offset and count parameters. This will return a List<Archive> type.

// Get a list with the first 1000 archives created by the API Key
List<Archive> archives = opentok.listArchives();

// Get a list of the first 50 archives created by the API Key
List<Archive> archives = opentok.listArchives(0, 50);

// Get a list of the next 50 archives
List<Archive> archives = opentok.listArchives(50, 50);

Note that you can also create an automatically archived session, by passing ArchiveMode.ALWAYS into the archiveMode() method of the SessionProperties.Builder object you use to build the sessionProperties parameter passed into the OpenTok.createSession() method (see "Creating Sessions," above).

For more information on archiving, see the OpenTok archiving programming guide.

Requirements

You need an OpenTok API key and API secret, which you can obtain by logging into your TokBox account.

The OpenTok Java SDK requires JDK 6 or greater to compile. Runtime requires Java SE 6 or greater. This project is tested on both OpenJDK and Oracle implementations.

Release Notes

See the Releases page for details about each release.

Important changes since v2.2.0

Changes in v2.2.1:

The default setting for the createSession() method is to create a session with the media mode set to relayed. In previous versions of the SDK, the default setting was to use the OpenTok Media Router (with the media mode set to routed in v2.2.0, or with p2p.preference="disabled" in previous versions). In a relayed session, clients will attempt to send streams directly between each other (peer to peer); and if clients cannot connect due to firewall restrictions, the session uses the OpenTok TURN server to relay audio-video streams.

Changes in v2.2.0:

This version of the SDK includes support for working with OpenTok archives.

This version of the SDK includes a number of improvements in the API design. These include a number of API changes. See the OpenTok 2.2 SDK Reference for details on the new API.

The API_Config class has been removed. Store your OpenTok API key and API secret in code outside of the SDK files.

The create_session() method has been renamed createSession(). Also, the method has changed to take one parameter: a SessionProperties object. You now generate a SessionProperties object using a Builder pattern.

The generate_token() method has been renamed generateToken(). Also, the method has changed to take two parameters: the session ID and a TokenOptions object.