[[sub:maven_central]]
=== Maven Central repository

Maven Central is a popular repository hosting open source libraries for consumption by Java projects.

To declare the link:https://repo.maven.apache.org/maven2/[Maven Central repository] for your build add this to your script:

.Adding central Maven repository
====

    </mirror>
  </mirrors>

  <!-- repositories
   | Specifies the list of default remote repositories that maven will search artifacts for.
  -->
  <repositories>
    <repository>
      <id>central</id>
      <name>Central Repository</name>
      <url>https://repo.maven.apache.org/maven2</url>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
    </repository>
  </repositories>

package multixds

// multixds knows how to target either central Istiod or all the Istiod pods on a cluster.

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"net"
	"net/url"
	"os"
	"strings"

	discovery "github.com/envoyproxy/go-control-plane/envoy/service/discovery/v3"
	xdsstatus "github.com/envoyproxy/go-control-plane/envoy/service/status/v3"
	"google.golang.org/grpc"

│   ├── build.gradle.kts
│   └── src
└── ⋮                       // <8>
----
<1> Project-specific cache directory generated by Gradle.
<2> The version catalog which defines a set of versions for dependencies in a central location.
<3> Contains the JAR file and configuration of the <<gradle_wrapper.adoc#gradle_wrapper_reference,Gradle Wrapper>>.

[.multi-language-sample]
=====
[source, kotlin]
----
repositories {
    mavenCentral()  // get dependencies from the Maven central repository
}
----
=====
[.multi-language-sample]
=====
[source, groovy]
----
repositories {
    mavenCentral()  // get dependencies from the Maven central repository
}
----
=====

Dependencies are requirements for building your application or library:

        builder.repositories().maven("Use another repo as well", "https://somewhere")
        builder.repositories().maven(null, "https://somewhere/2")
        builder.repositories().mavenCentral("Use Maven Central")

        when:
        builder.create(target).generate()

        then:
        assertOutputFile("""/*
 * This file was generated by the Gradle 'init' task.
 */

repositories {

Use Maven Central

Alternatively:
- Could use Google's Maven repository
- Or a local mirror

""")

        when:
        builder.create(target).generate()

        then:
        //mind the trailing whitespace at the empty commented line
        assertOutputFile("""$COMMON_START
 */

repositories {
    // Use Maven Central
    // ${""}
    // Alternatively:

			// an unswept set, then the mcentral will pop it off the
			// set, check its sweepgen, and ignore it.
			if nalloc == 0 {
				// Free totally free span directly back to the heap.
				mheap_.freeSpan(s)
				return true
			}
			// Return span back to the right mcentral list.
			if nalloc == s.nelems {
				mheap_.central[spc].mcentral.fullSwept(sweepgen).push(s)
			} else {

3389228,1,2014-03-28 13:52:56,2014-03-28 14:29:01,N,1,-73.950569152832031,40.792312622070313,-73.868507385253906,40.688491821289063,2,16.10,46,0,0.5,0,5.33,,,51.83,2,,75,63,green,0.04,0.0,0.0,62,37,5.37,1267,16...

Usually, a rule is specifically written to enrich metadata of one specific module and hence the `withModule` API should be preferred.

[[sec:rules_in_settings]]
=== Declaring rules in a central place

NOTE: Declaring component metadata rules in settings is an incubating feature