com.pushtechnology.diffusion.examples.CreateRemoteTopicView Maven / Gradle / Ivy
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* Copyright (C) 2022, 2023 DiffusionData Ltd.
*
* 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,
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* See the License for the specific language governing permissions and
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*******************************************************************************/
package com.pushtechnology.diffusion.examples;
import static java.util.concurrent.TimeUnit.SECONDS;
import java.util.Arrays;
import com.pushtechnology.diffusion.client.Diffusion;
import com.pushtechnology.diffusion.client.features.TopicUpdate;
import com.pushtechnology.diffusion.client.features.control.RemoteServers;
import com.pushtechnology.diffusion.client.features.control.RemoteServers.SecondaryInitiator.SecondaryInitiatorBuilder;
import com.pushtechnology.diffusion.client.features.control.topics.views.TopicViews;
import com.pushtechnology.diffusion.client.session.Session;
import com.pushtechnology.diffusion.client.topics.details.TopicType;
import com.pushtechnology.diffusion.datatype.json.JSON;
import com.pushtechnology.diffusion.datatype.json.JSONDataType;
/**
* An example of creating a remote topic view.
*
* Two sessions are established and a remote topic view is created to map part
* of the topic tree from the primary server to the secondary server
*
* @author DiffusionData Limited
* @since 6.5
*/
public final class CreateRemoteTopicView {
private static final String ROOT_TOPIC = "Accounts";
private final String primaryServerUrl;
private final String secondaryServerUrl;
/**
* Constructor.
*
* @param primaryServerUrl url for primary server
* @param secondaryServerUrl url for secondary server
*/
public CreateRemoteTopicView(
String primaryServerUrl,
String secondaryServerUrl) {
this.primaryServerUrl = primaryServerUrl;
this.secondaryServerUrl = secondaryServerUrl;
}
/**
* Creates a topic tree on primary server.
*
* Populates topic tree with JSON data
*/
private void addTopics(Session session)
throws Exception {
final JSONDataType jsonDataType = Diffusion.dataTypes().json();
final JSON value = jsonDataType.fromJsonString("{\"foo\" : \"bar\" }");
for (String type : Arrays.asList("Free", "Premium")) {
for (int i = 0; i < 10; i++) {
session.feature(TopicUpdate.class).addAndSet(
String.format(
"%s/%s/%s-Account-%d",
ROOT_TOPIC,
type,
type,
i),
Diffusion.newTopicSpecification(TopicType.JSON),
JSON.class,
value).get(5, SECONDS);
}
}
}
/**
* Establish remote server.
*
* @param name name of the remote server
*/
private void createRemoteServer(Session session, String name)
throws Exception {
session.feature(RemoteServers.class).createRemoteServer(
Diffusion.newRemoteServerBuilder(SecondaryInitiatorBuilder.class)
.principal("admin")
.credentials(Diffusion.credentials().password("password"))
.build(name, primaryServerUrl))
.get(5, SECONDS);
}
/**
* Create the remote topic view.
*
* @param serverName name of the remote server
* @param viewName name of the remote view
*/
private void createRemoteTopicView(
Session session,
String serverName,
String viewName)
throws Exception {
final String specification =
String.format(
"map ?%s/%s// from %s to %s/",
ROOT_TOPIC,
"Premium",
serverName,
viewName);
session.feature(TopicViews.class).createTopicView(
viewName,
specification).get(5, SECONDS);
}
/**
* Run the example.
*/
public void run() throws Exception {
final Session primarySession =
Diffusion.sessions().principal("admin").password("password")
.open(primaryServerUrl);
final Session secondarySession =
Diffusion.sessions().principal("admin").password("password")
.open(secondaryServerUrl);
addTopics(primarySession);
createRemoteServer(secondarySession, "foo");
createRemoteTopicView(secondarySession, "foo", "bar");
primarySession.close();
secondarySession.close();
}
}