/*
* Copyright 2010 Proofpoint, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.proofpoint.discovery.client;
import com.google.inject.Binder;
import com.google.inject.Module;
import com.google.inject.Provider;
import com.google.inject.Provides;
import com.google.inject.Scopes;
import com.google.inject.multibindings.Multibinder;
import com.proofpoint.discovery.client.announce.Announcement;
import com.proofpoint.discovery.client.announce.Announcer;
import com.proofpoint.discovery.client.announce.DiscoveryAnnouncementClient;
import com.proofpoint.discovery.client.announce.HttpDiscoveryAnnouncementClient;
import com.proofpoint.discovery.client.announce.ServiceAnnouncement;
import com.proofpoint.discovery.client.balancing.HttpServiceBalancerFactory;
import com.proofpoint.http.client.balancing.HttpServiceBalancer;
import com.proofpoint.http.client.balancing.HttpServiceBalancerImpl;
import com.proofpoint.http.client.balancing.HttpServiceBalancerStats;
import com.proofpoint.reporting.ReportCollectionFactory;
import org.weakref.jmx.ObjectNameBuilder;
import javax.annotation.PreDestroy;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import static com.google.common.base.Preconditions.checkState;
import static com.proofpoint.concurrent.Threads.daemonThreadsNamed;
import static com.proofpoint.configuration.ConfigurationModule.bindConfig;
import static com.proofpoint.discovery.client.DiscoveryBinder.discoveryBinder;
import static com.proofpoint.discovery.client.ServiceTypes.serviceType;
import static com.proofpoint.json.JsonCodecBinder.jsonCodecBinder;
import static org.weakref.jmx.guice.ExportBinder.newExporter;
public class DiscoveryModule
implements Module
{
private HttpServiceBalancerImpl discoveryBalancer = null;
@Override
public void configure(Binder binder)
{
// bind service inventory
binder.bind(ServiceInventory.class).asEagerSingleton();
bindConfig(binder).to(ServiceInventoryConfig.class);
// for legacy configurations
bindConfig(binder).to(DiscoveryClientConfig.class);
// bind discovery client and dependencies
binder.bind(DiscoveryLookupClient.class).to(HttpDiscoveryLookupClient.class).in(Scopes.SINGLETON);
binder.bind(DiscoveryAnnouncementClient.class).to(HttpDiscoveryAnnouncementClient.class).in(Scopes.SINGLETON);
jsonCodecBinder(binder).bindJsonCodec(ServiceDescriptorsRepresentation.class);
jsonCodecBinder(binder).bindJsonCodec(Announcement.class);
// bind the http client
discoveryBinder(binder).bindDiscoveredHttpClientWithBalancer("discovery", serviceType("discovery"), ForDiscoveryClient.class);
// bind announcer
binder.bind(Announcer.class).in(Scopes.SINGLETON);
// Must create a multibinder for service announcements or construction will fail if no
// service announcements are bound, which is legal for processes that don't have public services
Multibinder.newSetBinder(binder, ServiceAnnouncement.class);
binder.bind(ServiceSelectorFactory.class).to(CachingServiceSelectorFactory.class).in(Scopes.SINGLETON);
binder.bind(HttpServiceBalancerFactory.class).in(Scopes.SINGLETON);
binder.bind(ScheduledExecutorService.class)
.annotatedWith(ForDiscoveryClient.class)
.toProvider(DiscoveryExecutorProvider.class)
.in(Scopes.SINGLETON);
newExporter(binder).export(ServiceInventory.class).withGeneratedName();
}
@Provides
@ServiceType("discovery")
public HttpServiceBalancer createHttpServiceBalancer(ReportCollectionFactory reportCollectionFactory)
{
return getHttpServiceBalancerImpl(reportCollectionFactory);
}
@Provides
@ServiceType("discovery")
synchronized public HttpServiceBalancerImpl getHttpServiceBalancerImpl(ReportCollectionFactory reportCollectionFactory)
{
if (discoveryBalancer == null) {
String name = new ObjectNameBuilder(HttpServiceBalancerStats.class.getPackage().getName())
.withProperty("type", "ServiceClient")
.withProperty("serviceType", "discovery")
.build();
discoveryBalancer = new HttpServiceBalancerImpl("discovery", reportCollectionFactory.createReportCollection(HttpServiceBalancerStats.class, name));
}
return discoveryBalancer;
}
private static class DiscoveryExecutorProvider
implements Provider<ScheduledExecutorService>
{
private ScheduledExecutorService executor;
@Override
public ScheduledExecutorService get()
{
checkState(executor == null, "provider already used");
executor = new ScheduledThreadPoolExecutor(5, daemonThreadsNamed("Discovery-%s"));
return executor;
}
@PreDestroy
public void destroy()
{
if (executor != null) {
executor.shutdownNow();
}
}
}
}