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Initialize an mkdocs-based Jedis doc site #3998

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36 changes: 36 additions & 0 deletions .github/workflows/docs.yml
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name: Publish Docs
on:
push:
branches: ["master"]
permissions:
contents: read
pages: write
id-token: write
concurrency:
group: "pages"
cancel-in-progress: false
jobs:
build-and-deploy:
concurrency: ci-${{ github.ref }}
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v3
- uses: actions/setup-python@v4
with:
python-version: 3.9
- name: Install dependencies
run: |
python -m pip install --upgrade pip
pip install mkdocs mkdocs-material pymdown-extensions mkdocs-macros-plugin
- name: Build docs
run: |
mkdocs build -d docsbuild
- name: Setup Pages
uses: actions/configure-pages@v3
- name: Upload artifact
uses: actions/upload-pages-artifact@v1
with:
path: 'docsbuild'
- name: Deploy to GitHub Pages
id: deployment
uses: actions/deploy-pages@v2
3 changes: 3 additions & 0 deletions docs/Dockerfile
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This file should be ignored from spell check.

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FROM squidfunk/mkdocs-material
RUN pip install mkdocs-macros-plugin
RUN pip install mkdocs-glightbox
15 changes: 15 additions & 0 deletions docs/README.md
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# Jedis Documentation

This documenation uses [MkDocs](https://www.mkdocs.org/) to generate the static site.
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documenation


See [mkdocs.yml](../mkdocs.yml) for the configuration.

To develop the documentation locally, you can use the included [Dockefile](ockerfile) to build a container with all the
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Dockefile
and its link

dependencies, and run it to preview your changes:

```bash
# in docs/
docker build -t squidfunk/mkdocs-material .
# cd ..
docker run --rm -it -p 8000:8000 -v ${PWD}:/docs squidfunk/mkdocs-material
```
135 changes: 135 additions & 0 deletions docs/advanced-usage.md
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# Advanced Usage

## Transactions

To do transactions in Jedis, you have to wrap operations in a transaction block, very similar to pipelining:

```java
jedis.watch (key1, key2, ...);
Transaction t = jedis.multi();
t.set("foo", "bar");
t.exec();
```

Note: when you have any method that returns values, you have to do like this:


```java
Transaction t = jedis.multi();
t.set("fool", "bar");
Response<String> result1 = t.get("fool");

t.zadd("foo", 1, "barowitch"); t.zadd("foo", 0, "barinsky"); t.zadd("foo", 0, "barikoviev");
Response<Set<String>> sose = t.zrange("foo", 0, -1); // get the entire sortedset
t.exec(); // dont forget it

String foolbar = result1.get(); // use Response.get() to retrieve things from a Response
int soseSize = sose.get().size(); // on sose.get() you can directly call Set methods!

// List<Object> allResults = t.exec(); // you could still get all results at once, as before
```
Note that a Response Object does not contain the result before t.exec() is called (it is a kind of a Future). Forgetting exec gives you exceptions. In the last lines, you see how transactions/pipelines were dealt with before version 2. You can still do it that way, but then you need to extract objects from a list, which contains also Redis status messages.

Note 2: Redis does not allow to use intermediate results of a transaction within that same transaction. This does not work:

```java
// this does not work! Intra-transaction dependencies are not supported by Redis!
jedis.watch(...);
Transaction t = jedis.multi();
if(t.get("key1").equals("something"))
t.set("key2", "value2");
else
t.set("key", "value");
```

However, there are some commands like setnx, that include such a conditional execution. Those are of course supported within transactions. You can build your own customized commands using eval/ LUA scripting.


## Pipelining

Sometimes you need to send a bunch of different commands. A very cool way to do that, and have better performance than doing it the naive way, is to use pipelining. This way you send commands without waiting for response, and you actually read the responses at the end, which is faster.

Here is how to do it:

```java
Pipeline p = jedis.pipelined();
p.set("fool", "bar");
p.zadd("foo", 1, "barowitch"); p.zadd("foo", 0, "barinsky"); p.zadd("foo", 0, "barikoviev");
Response<String> pipeString = p.get("fool");
Response<Set<String>> sose = p.zrange("foo", 0, -1);
p.sync();

int soseSize = sose.get().size();
Set<String> setBack = sose.get();
```
For more explanations see code comments in the transaction section.


## Publish/Subscribe

To subscribe to a channel in Redis, create an instance of JedisPubSub and call subscribe on the Jedis instance:

```java
class MyListener extends JedisPubSub {
public void onMessage(String channel, String message) {
}

public void onSubscribe(String channel, int subscribedChannels) {
}

public void onUnsubscribe(String channel, int subscribedChannels) {
}

public void onPSubscribe(String pattern, int subscribedChannels) {
}

public void onPUnsubscribe(String pattern, int subscribedChannels) {
}

public void onPMessage(String pattern, String channel, String message) {
}
}

MyListener l = new MyListener();

jedis.subscribe(l, "foo");
```
Note that subscribe is a blocking operation because it will poll Redis for responses on the thread that calls subscribe. A single JedisPubSub instance can be used to subscribe to multiple channels. You can call subscribe or psubscribe on an existing JedisPubSub instance to change your subscriptions.


### Monitoring

To use the monitor command you can do something like the following:

```java
new Thread(new Runnable() {
public void run() {
Jedis j = new Jedis("localhost");
for (int i = 0; i < 100; i++) {
j.incr("foobared");
try {
Thread.sleep(200);
} catch (InterruptedException e) {
}
}
j.disconnect();
}
}).start();

jedis.monitor(new JedisMonitor() {
public void onCommand(String command) {
System.out.println(command);
}
});
```

## Miscellaneous

### A note about String and Binary - what is native?

Redis/Jedis talks a lot about Strings. And here [[http://redis.io/topics/internals]] it says Strings are the basic building block of Redis. However, this stress on strings may be misleading. Redis' "String" refer to the C char type (8 bit), which is incompatible with Java Strings (16-bit). Redis sees only 8-bit blocks of data of predefined length, so normally it doesn't interpret the data (it's "binary safe"). Therefore in Java, byte[] data is "native", whereas Strings have to be encoded before being sent, and decoded after being retrieved by the SafeEncoder. This has some minor performance impact.
In short: if you have binary data, don't encode it into String, but use the binary versions.

### A note on Redis' master/slave distribution

A Redis network consists of redis servers, which can be either masters or slaves. Slaves are synchronized to the master (master/slave replication). However, master and slaves look identical to a client, and slaves do accept write requests, but they will not be propagated "up-hill" and could eventually be overwritten by the master. It makes sense to route reads to slaves, and write demands to the master. Furthermore, being a slave doesn't prevent from being considered master by another slave.
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4 changes: 4 additions & 0 deletions docs/css/extra.css
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This file should be ignored from spell check.

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/* extra.css */
.md-header {
background-color: #FB2A2C;
}
44 changes: 44 additions & 0 deletions docs/faq.md
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# Frequently Asked Questions

## If you get `java.net.SocketTimeoutException: Read timed out` exception

Try setting own `timeout` value when constructing `JedisPool` using the following constructor:
```java
JedisPool(GenericObjectPoolConfig poolConfig, String host, int port, int timeout)
```
where `timeout` is given as milliseconds.

Default `timeout` value is **2 seconds**.

## JedisPool blocks after getting 8 connections

JedisPool defaults to 8 connections, you can change this in the PoolConfig:

```java
JedisPoolConfig poolConfig = new JedisPoolConfig();
poolConfig.setMaxTotal(maxTotal); // maximum active connections
poolConfig.setMaxIdle(maxIdle); // maximum idle connections
```

Take into account that `JedisPool` inherits commons-pool [BaseObjectPoolConfig](https://commons.apache.org/proper/commons-pool/api-2.3/org/apache/commons/pool2/impl/BaseObjectPoolConfig.html) which has a lot of configuration parameters.
We've set some defined ones which suit most of the cases. In case, you experience [issues](https://github.com/xetorthio/jedis/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+JedisPool) tuning these parameters may help.

## How to configure the buffer size of socket(s)

The buffer size of all Jedis sockets in an application can be configured through system property.

Buffer size of input stream can be configured by setting `jedis.bufferSize.input` or `jedis.bufferSize` system property.
Buffer size of output stream can be configured by setting `jedis.bufferSize.output` or `jedis.bufferSize` system property.
If you want to set the buffer size of both input and output stream to same value, you can just set `jedis.bufferSize`.

Note: This feature is available since Jedis 4.2.0.

## How to avoid cluster initialization error

As of Jedis 4.0.0, a `JedisClusterOperationException` is raised with the message `Could not initialize cluster slots cache.` when the cluster initialization process fails.

Should you would want to avoid this error (for example, creating `JedisConnectionFactory` to an unavailable cluster for a spring-data-redis `Bean`), set the system property `jedis.cluster.initNoError` to any value.
In the console, add the option `-Djedis.cluster.initNoError`.
In an application, `System.setProperty("jedis.cluster.initNoError", "");` can be set before creating any cluster object.

Note: This feature is available since Jedis 4.4.2.
1 change: 1 addition & 0 deletions docs/index.md
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{% include 'README.md' %}
34 changes: 0 additions & 34 deletions docs/jedis-maven.md
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The GitHub home page contains a link to this file. If we remove this file, we should also change the link in README.md in root folder.

This file was deleted.

35 changes: 35 additions & 0 deletions mkdocs.yml
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site_name: Jedis
repo_name: Jedis
site_author: Redis, Inc.
site_description: Jedis is a Redis client for the JVM.
repo_url: https://github.com/redis/jedis
remote_branch: gh-pages

theme:
name: material
logo: assets/images/logo.png
favicon: assets/images/favicon-16x16.png
extra_css:
- css/extra.css

plugins:
- search
- macros:
include_dir: .

nav:
- Home: index.md
- Migrating from older versions:
- 3 to 4:
- Breaking changes: 3to4.md
- Primitives: 3to4-primitives.md
- ZSET: 3to4-zset-list.md
- Using Jedis with ...:
- Search: redisearch.md
- JSON: redisjson.md
- Failover: failover.md
- FAQ: faq.md
- API Reference: https://www.javadoc.io/doc/redis.clients/jedis/latest/index.html
- Jedis Guide: https://redis.io/docs/latest/develop/connect/clients/java/jedis/
- Redis Command Reference: https://redis.io/docs/latest/commands/

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