I'm running Dropwizard together with Elasticsearch and MongoDB. Both
Elasticsearch and MongoDB are Managed.
This means I configure them in the constructor, while they are started on
start() and stopped on stop().
public MongoManaged(AbilityConfiguration configuration) {
replicaSet = new ArrayList<>();
credentials = MongoCredential.createCredential(configuration.mongo.user,
configuration.mongo.db, configuration.mongo.password.toCharArray());
configuration.mongo.servers.forEach((AbilityConfiguration.Server server) ->
{
replicaSet.add(new ServerAddress(server.getHost(), server.getPort()));
});
databaseName = configuration.mongo.db;
}
public void start() {
System.out.println("Starting mongo...");
MongoClientOptions mongoClientOptions =
MongoClientOptions.builder().codecRegistry(generatePOJOCodecRegistry()).connectionsPerHost(100).build();
mongoClient = new MongoClient(replicaSet, credentials, mongoClientOptions);
database = mongoClient.getDatabase(databaseName);
}
public MongoDatabase getDatabase() {
return database;
}
public void stop() {
System.out.println("Stopping mongo...");
mongoClient.close();
}
In Dropwizards run() routine I add the managed systems to the environment
as well as the health checks, followed by the REST routines.
MongoManaged mongo = new MongoManaged(configuration);
environment.lifecycle().manage(mongo);
environment.lifecycle().addLifeCycleListener(lifeCycleListener);
environment.healthChecks().register("MongoHealthCheck", new
MongoHealthCheck(mongo.getDatabase()));
environment.jersey().register(new UserResource(mongo.getDatabase()));
...
Now this fails, as when registering e.g. "UserResource" to the environment,
mongo was not started yet and mongo.getDatabase() returns null at this
point.
I try to work around this issue by registering a LifeCycle listener and
registering the "UserResource" when MongoDB started but then I got an error:
"java.lang.IllegalStateException: The resource configuration is not
modifiable in this context."
environment.lifecycle().addLifeCycleListener(new LifeCycle.Listener() {
@Override
public void lifeCycleStarting(LifeCycle lifeCycle) {
}
@Override
public void lifeCycleStarted(LifeCycle lifeCycle) {
environment.jersey().register(new UserResource(mongo.getDatabase()));
}
@Override
public void lifeCycleFailure(LifeCycle lifeCycle, Throwable throwable) {
}
@Override
public void lifeCycleStopping(LifeCycle lifeCycle) {
}
@Override
public void lifeCycleStopped(LifeCycle lifeCycle) {
}
});
So how can I solve this issue? Searching through google just gave mew
examples, where they move all the code from managed start() to the
constructor
as this is executed before and we don't need for start() to finish. But
this doesn't seem to me as a clean solution.
Any suggestions?
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