server/container/guice/guice-common/src/main/java/org/apache/james/GuiceJamesServer.java

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package org.apache.james;

import java.util.Arrays;
import java.util.Optional;

import javax.annotation.PreDestroy;

import org.apache.james.jmap.JMAPServer;
import org.apache.james.modules.CommonServicesModule;
import org.apache.james.modules.MailetProcessingModule;
import org.apache.james.modules.ProtocolsModule;
import org.apache.james.utils.ConfigurationsPerformer;
import org.apache.james.utils.ExtendedServerProbe;
import org.apache.james.utils.GuiceServerProbe;
import org.apache.james.webadmin.Port;
import org.apache.james.webadmin.WebAdminServer;
import org.apache.onami.lifecycle.core.Stager;

import com.google.common.collect.Iterables;
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Key;
import com.google.inject.Module;
import com.google.inject.TypeLiteral;
import com.google.inject.util.Modules;

public class GuiceJamesServer {

    private final Module module;
    private Stager<PreDestroy> preDestroy;
    private GuiceServerProbe serverProbe;
    private int jmapPort;
    private Optional<Port> webadminPort;

    public GuiceJamesServer() {
        this(Modules.combine(
                        new CommonServicesModule(),
                        new ProtocolsModule(),
                        new MailetProcessingModule()));
    }

    private GuiceJamesServer(Module module) {
        this.module = module;
    }
    
    public GuiceJamesServer combineWith(Module... modules) {
        return new GuiceJamesServer(Modules.combine(Iterables.concat(Arrays.asList(module), Arrays.asList(modules))));
    }
    
    public GuiceJamesServer overrideWith(Module... overrides) {
        return new GuiceJamesServer(Modules.override(module).with(overrides));
    }
    
    public void start() throws Exception {
        Injector injector = Guice.createInjector(module);
        preDestroy = injector.getInstance(Key.get(new TypeLiteral<Stager<PreDestroy>>() {}));
        injector.getInstance(ConfigurationsPerformer.class).initModules();
        serverProbe = injector.getInstance(GuiceServerProbe.class);
        jmapPort = injector.getInstance(JMAPServer.class).getPort();
        webadminPort =locateWebAdminPort(injector);
    }

    private Optional<Port> locateWebAdminPort(Injector injector) {
        try {
            return Optional.of(injector.getInstance(WebAdminServer.class).getPort());
        } catch(Exception e) {
            return Optional.empty();
        }
    }

    public void stop() {
        if (preDestroy != null) {
            preDestroy.stage();
        }
    }

    public ExtendedServerProbe serverProbe() {
        return serverProbe;
    }

    public int getJmapPort() {
        return jmapPort;
    }

    public Optional<Port> getWebadminPort() {
        return webadminPort;
    }
}