Algolia Search API Client for Java v2
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README.md

Algolia Search API Client for Java

Algolia Search is a hosted full-text, numerical, and faceted search engine capable of delivering realtime results from the first keystroke.

The Algolia Search API Client for Java lets you easily use the Algolia Search REST API from your Java code.

WARNING: The JVM has an infinite cache on successful DNS resolution. As our hostnames points to multiple IPs, the load could be not evenly spread among our machines, and you might also target a dead machine.

You should change this TTL by setting the property networkaddress.cache.ttl. For example to set the cache to 60 seconds:

java.security.Security.setProperty("networkaddress.cache.ttl", "60");

For debug purposes you can enable debug logging on the API client. It's using slf4j so it should be compatible with most java logger. The logger is named algoliasearch.

API Documentation

You can find the full reference on Algolia's website.

  1. Supported platforms

  2. Install

  3. Quick Start

  4. Push data

  5. Configure

  6. Search

  7. Search UI

  8. List of available methods

Getting Started

Supported platforms

This API client only supports Java 1.8 & Java 1.9 If you need support for an older version, please use this package.

Install

With Maven, add the following dependency to your pom.xml file:

<dependency>
  <groupId>com.algolia</groupId>
  <artifactId>algoliasearch</artifactId>
  <version>[2,]</version>
</dependency>

Then, for the asynchronous version, use:

<dependency>
  <groupId>com.algolia</groupId>
  <artifactId>algoliasearch-async</artifactId>
  <version>[2,]</version>
</dependency>

Or on Google AppEngine, use:

<dependency>
  <groupId>com.algolia</groupId>
  <artifactId>algoliasearch-appengine</artifactId>
  <version>[2,]</version>
</dependency>

Builder

The v2 of the api client uses a builder to create the APIClient object:

  • on Google App Engine use the AppEngineAPIClientBuilder
    • if you fancy Future, use the AsyncHttpAPIClientBuilder
  • on Android, use the Android API Client
  • on a regular JVM, use the ApacheAPIClientBuilder

POJO, JSON & Jackson2

The Index (and AsyncIndex) classes are parametrized with a Java class. If you specify one it enables you to have type safe method results. This parametrized Java class is expected to follow the POJO convention:

  • A constructor without parameters
  • Getters & setters for every field you want to (de)serialize

Example:

public class Contact {

  private String name;
  private int age;

  public Contact() {}

  public String getName() {
    return name;
  }

  public Contact setName(String name) {
    this.name = name;
    return this;
  }

  public int getAge() {
    return age;
  }

  public Contact setAge(int age) {
    this.age = age;
    return this;
  }
}

All the serialization/deserialization is done with Jackson2. You can add your custom ObjectMapper with the method setObjectMapper of the builder. Changing it might produce unexpected results. You can find the one used in the interface com.algolia.search.Defaults.DEFAULT_OBJECT_MAPPER.

Async & Future

All methods of the AsyncAPIClient are exactly the same as the APIClient but returns CompletableFuture<?>. All other classes are prefixes with Async. You can also pass an optional ExecutorService to the build of the AsyncHttpAPIClientBuilder.

Quick Start

In 30 seconds, this quick start tutorial will show you how to index and search objects.

Initialize the client

To begin, you will need to initialize the client. In order to do this you will need your Application ID and API Key. You can find both on your Algolia account.

APIClient client =
  new ApacheAPIClientBuilder("YourApplicationID", "YourAPIKey").build();

Index<Contact> index = client.initIndex("your_index_name", Contact.class);

For the asynchronous version:

AsyncAPIClient client =
  new AsyncHttpAPIClientBuilder("YourApplicationID", "YourAPIKey").build();

AsyncIndex<Contact> index = client.initIndex("your_index_name", Contact.class);

For Google AppEngine:

APIClient client =
  new AppEngineAPIClientBuilder("YourApplicationID", "YourAPIKey").build();

Index<Contact> index = client.initIndex("your_index_name", Contact.class);

Push data

Without any prior configuration, you can start indexing contacts in the contacts index using the following code:

class Contact {

	private String firstname;
	private String lastname;
	private int followers;
	private String company;

	//Getters/Setters ommitted
}

Index<Contact> index = client.initIndex("contacts", Contact.class);
index.addObject(new Contact()
      .setFirstname("Jimmie")
      .setLastname("Barninger")
      .setFollowers(93)
      .setCompany("California Paint"));
index.addObject(new JSONObject()
      .setFirstname("Warren")
      .setLastname("Speach")
      .setFollowers(42)
      .setCompany("Norwalk Crmc"));

If you prefer the async version:

AsyncIndex<Contact> index = client.initIndex("contacts", Contact.class);
index.addObject(new Contact()
      .setFirstname("Jimmie")
      .setLastname("Barninger")
      .setFollowers(93)
      .setCompany("California Paint"));
index.addObject(new JSONObject()
      .setFirstname("Warren")
      .setLastname("Speach")
      .setFollowers(42)
      .setCompany("Norwalk Crmc"));

Configure

Settings can be customized to fine tune the search behavior. For example, you can add a custom sort by number of followers to further enhance the built-in relevance:

//Sync & Async version

index.setSettings(new IndexSettings().setCustomRanking(Collections.singletonList("desc(followers)")));

You can also configure the list of attributes you want to index by order of importance (most important first).

Note: The Algolia engine is designed to suggest results as you type, which means you'll generally search by prefix. In this case, the order of attributes is very important to decide which hit is the best:

//Sync & Async version

index.setSettings(new IndexSettings().setSearchableAttributes(
	Arrays.asList("lastname", "firstname", "company")
);

Search

You can now search for contacts using firstname, lastname, company, etc. (even with typos):

//Sync version

// search by firstname
System.out.println(index.search(new Query("jimmie")));
// search a firstname with typo
System.out.println(index.search(new Query("jimie")));
// search for a company
System.out.println(index.search(new Query("california paint")));
// search for a firstname & company
System.out.println(index.search(new Query("jimmie paint")));
//Async version

// search by firstname
System.out.println(index.search(new Query("jimmie")).get());
// search a firstname with typo
System.out.println(index.search(new Query("jimie")).get());
// search for a company
System.out.println(index.search(new Query("california paint")).get());
// search for a firstname & company
System.out.println(index.search(new Query("jimmie paint")).get());

Search UI

Warning: If you are building a web application, you may be more interested in using one of our frontend search UI libraries

The following example shows how to build a front-end search quickly using InstantSearch.js

index.html

<!doctype html>
<head>
  <meta charset="UTF-8">
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/instantsearch.js@2.3/dist/instantsearch.min.css">
  <!-- Always use `2.x` versions in production rather than `2` to mitigate any side effects on your website,
  Find the latest version on InstantSearch.js website: https://community.algolia.com/instantsearch.js/v2/guides/usage.html -->
</head>
<body>
  <header>
    <div>
       <input id="search-input" placeholder="Search for products">
       <!-- We use a specific placeholder in the input to guides users in their search. -->
    
  </header>
  <main>
      
      
  </main>

  <script type="text/html" id="hit-template">
    
      <p class="hit-name">{{{_highlightResult.firstname.value}}} {{{_highlightResult.lastname.value}}}</p>
    
  </script>

  <script src="https://cdn.jsdelivr.net/npm/instantsearch.js@2.3/dist/instantsearch.min.js"></script>
  <script src="app.js"></script>
</body>

app.js

var search = instantsearch({
  // Replace with your own values
  appId: 'YourApplicationID',
  apiKey: 'YourSearchOnlyAPIKey', // search only API key, no ADMIN key
  indexName: 'contacts',
  urlSync: true,
  searchParameters: {
    hitsPerPage: 10
  }
});

search.addWidget(
  instantsearch.widgets.searchBox({
    container: '#search-input'
  })
);

search.addWidget(
  instantsearch.widgets.hits({
    container: '#hits',
    templates: {
      item: document.getElementById('hit-template').innerHTML,
      empty: "We didn't find any results for the search <em>\"{{query}}\"</em>"
    }
  })
);

search.start();

List of available methods

Search

Indexing

Settings

Manage indices

API Keys

Synonyms

Query rules

A/B Test

MultiClusters

Advanced

Getting Help