Tomcat Embedded Server

TomcatEmbeddedServer.java

import org.apache.catalina.Context;
import org.apache.catalina.Engine;
import org.apache.catalina.Host;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.connector.Connector;
import org.apache.catalina.startup.Embedded;

import java.io.File;

/**
 * Adapter to the {@link org.apache.catalina.startup.Embedded}
 *
 * @author <a href="mailto:stanley.shyiko@gmail.com">shyiko</a>
 * @since 07.05.2011
 */
public class TomcatEmbeddedServer {

    private String homeDirectory;
    private Embedded embeddedServer;
    private Host host;

    /**
     * Construct new instance using custom Tomcat home directory
     * @param homeDirectory catalina root directory
     */
    public TomcatEmbeddedServer(String homeDirectory) {
        if (homeDirectory == null) {
            throw new IllegalArgumentException("homeDirectory should not be null");
        }
        this.homeDirectory = homeDirectory.trim();
    }

    /**
     * Start Tomcat embedded server
     */
    public void start() {
        embeddedServer = new Embedded();
        embeddedServer.setCatalinaHome(homeDirectory);

        Engine engine = this.embeddedServer.createEngine();
        engine.setDefaultHost("localhost");
        File webappsDirectory = new File(homeDirectory, "webapps");
        webappsDirectory.mkdirs();
        host = this.embeddedServer.createHost(engine.getDefaultHost(), webappsDirectory.getAbsolutePath());
        engine.addChild(host);
        embeddedServer.addEngine(engine);

        try {
            Connector connector = new Connector();
            connector.setPort(8080);
            embeddedServer.addConnector(connector);
            embeddedServer.start();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Deploy web application
     * @param contextPath context path
     * @param artifactPath artifact location (e.g. war archive)
     */
    public void deploy(String contextPath, String artifactPath) {
        if (embeddedServer == null) {
            throw new IllegalStateException("Server is not being started");
        }
        Context context = embeddedServer.createContext(getContextPath(contextPath), artifactPath);
        context.setReloadable(false);
        host.addChild(context);
    }

    /**
     * Undeploy web application
     * @param contextPath context path
     */
    public void undeploy(String contextPath) {
        if (embeddedServer == null) {
            throw new IllegalStateException("Server is not being started");
        }
        Context context = host.map(getContextPath(contextPath));
        host.removeChild(context);
    }

    private String getContextPath(String contextPath) {
        if (contextPath == null) {
            throw new IllegalArgumentException("contextPath should not be null");
        }
        contextPath = contextPath.trim();
        return contextPath.startsWith("/") ? contextPath : "/" + contextPath;
    }

    /**
     * Stop Tomcat embedded server
     */
    public void stop() {
        try {
            if (embeddedServer != null) {
                embeddedServer.stop();
            }
        } catch (LifecycleException e) {
            throw new RuntimeException(e);
        } finally {
            embeddedServer = null;
        }
    }
}