Package org.eclipse.aether

Interface RepositorySystem

All Superinterfaces:

AutoCloseable, Closeable

public interface RepositorySystem
extends Closeable

The main entry point to the repository system and its functionality. Note that obtaining a concrete implementation of this interface (e.g. via dependency injection, service locator, etc.) is dependent on the application and its specific needs, please consult the online documentation for examples and directions on booting the system.

When the repository system or the application integrating it is about to exit, invoke the shutdown() to let resolver system perform possible resource cleanups.

Restriction:

This interface is not intended to be extended by clients.

Restriction:

This interface is not intended to be implemented by clients.

Method Summary

Modifier and Type	Method	Description
void	addOnSystemEndedHandler(Runnable handler)	Registers an "on repository system end" handler, executed after repository system is shut down.
default void	close()	Closes this instance, invokes shutdown().
CollectResult	collectDependencies(RepositorySystemSession session, CollectRequest request)	Collects the transitive dependencies of an artifact and builds a dependency graph.
RepositorySystemSession.SessionBuilder	createSessionBuilder()	Creates a brand-new session builder instance that produces "top level" (root) session.
DeployResult	deploy(RepositorySystemSession session, DeployRequest request)	Uploads a collection of artifacts and their accompanying metadata to a remote repository.
List<DependencyNode>	flattenDependencyNodes(RepositorySystemSession session, DependencyNode root)	Flattens the provided graph as DependencyNode into a List<DependencyNode> according to session configuration.
InstallResult	install(RepositorySystemSession session, InstallRequest request)	Installs a collection of artifacts and their accompanying metadata to the local repository.
RemoteRepository	newDeploymentRepository(RepositorySystemSession session, RemoteRepository repository)	Forms a remote repository suitable for artifact deployment by applying the session's authentication selector and similar network configuration to the given repository prototype.
LocalRepositoryManager	newLocalRepositoryManager(RepositorySystemSession session, LocalRepository localRepository)	Creates a new manager for the specified local repository.
List<RemoteRepository>	newResolutionRepositories(RepositorySystemSession session, List<RemoteRepository> repositories)	Forms remote repositories suitable for artifact resolution by applying the session's authentication selector and similar network configuration to the given repository prototypes.
SyncContext	newSyncContext(RepositorySystemSession session, boolean shared)	Creates a new synchronization context.
ArtifactDescriptorResult	readArtifactDescriptor(RepositorySystemSession session, ArtifactDescriptorRequest request)	Gets information about an artifact like its direct dependencies and potential relocations.
ArtifactResult	resolveArtifact(RepositorySystemSession session, ArtifactRequest request)	Resolves the path for an artifact.
List<ArtifactResult>	resolveArtifacts(RepositorySystemSession session, Collection<? extends ArtifactRequest> requests)	Resolves the paths for a collection of artifacts.
DependencyResult	resolveDependencies(RepositorySystemSession session, DependencyRequest request)	Collects and resolves the transitive dependencies of an artifact.
List<MetadataResult>	resolveMetadata(RepositorySystemSession session, Collection<? extends MetadataRequest> requests)	Resolves the paths for a collection of metadata.
VersionResult	resolveVersion(RepositorySystemSession session, VersionRequest request)	Resolves an artifact's meta version (if any) to a concrete version.
VersionRangeResult	resolveVersionRange(RepositorySystemSession session, VersionRangeRequest request)	Expands a version range to a list of matching versions, in ascending order.
void	shutdown()	Signals to repository system to shut down.

Method Details

resolveVersionRange

VersionRangeResult resolveVersionRange(RepositorySystemSession session,
 VersionRangeRequest request)
                                throws VersionRangeResolutionException

Expands a version range to a list of matching versions, in ascending order. For example, resolves "[3.8,4.0)" to "3.8", "3.8.1", "3.8.2". Note that the returned list of versions is only dependent on the configured repositories and their contents, the list is not processed by the session's version filter.

The supplied request may also refer to a single concrete version rather than a version range. In this case though, the result contains simply the (parsed) input version, regardless of the repositories and their contents.

Parameters:

session - The repository session, must not be null.

request - The version range request, must not be null.

Returns:

The version range result, never null.

Throws:

VersionRangeResolutionException - If the requested range could not be parsed. Note that an empty range does not raise an exception.

See Also:

• newResolutionRepositories(RepositorySystemSession, List)

resolveVersion

VersionResult resolveVersion(RepositorySystemSession session,
 VersionRequest request)
                      throws VersionResolutionException

Resolves an artifact's meta version (if any) to a concrete version. For example, resolves "1.0-SNAPSHOT" to "1.0-20090208.132618-23".

Parameters:

session - The repository session, must not be null.

request - The version request, must not be null.

Returns:

The version result, never null.

Throws:

VersionResolutionException - If the metaversion could not be resolved.

See Also:

• newResolutionRepositories(RepositorySystemSession, List)

readArtifactDescriptor

ArtifactDescriptorResult readArtifactDescriptor(RepositorySystemSession session,
 ArtifactDescriptorRequest request)
                                         throws ArtifactDescriptorException

Gets information about an artifact like its direct dependencies and potential relocations.

Parameters:

session - The repository session, must not be null.

request - The descriptor request, must not be null.

Returns:

The descriptor result, never null.

Throws:

ArtifactDescriptorException - If the artifact descriptor could not be read.

See Also:

• RepositorySystemSession.getArtifactDescriptorPolicy()
• newResolutionRepositories(RepositorySystemSession, List)

collectDependencies

CollectResult collectDependencies(RepositorySystemSession session,
 CollectRequest request)
                           throws DependencyCollectionException

Collects the transitive dependencies of an artifact and builds a dependency graph. Note that this operation is only concerned about determining the coordinates of the transitive dependencies. To also resolve the actual artifact files, use resolveDependencies(RepositorySystemSession, DependencyRequest).

Parameters:

session - The repository session, must not be null.

request - The collection request, must not be null.

Returns:

The collection result, never null.

Throws:

DependencyCollectionException - If the dependency tree could not be built.

See Also:

• RepositorySystemSession.getDependencyTraverser()
• RepositorySystemSession.getDependencyManager()
• RepositorySystemSession.getDependencySelector()
• RepositorySystemSession.getVersionFilter()
• RepositorySystemSession.getDependencyGraphTransformer()
• newResolutionRepositories(RepositorySystemSession, List)

resolveDependencies

DependencyResult resolveDependencies(RepositorySystemSession session,
 DependencyRequest request)
                              throws DependencyResolutionException

Collects and resolves the transitive dependencies of an artifact. This operation is essentially a combination of collectDependencies(RepositorySystemSession, CollectRequest) and resolveArtifacts(RepositorySystemSession, Collection).

Parameters:

session - The repository session, must not be null.

request - The dependency request, must not be null.

Returns:

The dependency result, never null.

Throws:

DependencyResolutionException - If the dependency tree could not be built or any dependency artifact could not be resolved.

See Also:

• newResolutionRepositories(RepositorySystemSession, List)

flattenDependencyNodes

List<DependencyNode> flattenDependencyNodes(RepositorySystemSession session,
 DependencyNode root)

Flattens the provided graph as DependencyNode into a List<DependencyNode> according to session configuration.

Parameters:

session - The repository session, must not be null.

root - The dependency node root of the graph, must not be null.

Returns:

The flattened list of dependency nodes, never null.

Since:

2.0.0

resolveArtifact

ArtifactResult resolveArtifact(RepositorySystemSession session,
 ArtifactRequest request)
                        throws ArtifactResolutionException

Resolves the path for an artifact. The artifact will be downloaded to the local repository if necessary. An artifact that is already resolved will be skipped and is not re-resolved. In general, callers must not assume any relationship between an artifact's resolved filename and its coordinates. Note that this method assumes that any relocations have already been processed.

Parameters:

session - The repository session, must not be null.

request - The resolution request, must not be null.

Returns:

The resolution result, never null.

Throws:

ArtifactResolutionException - If the artifact could not be resolved.

See Also:

• Artifact.getFile()
• newResolutionRepositories(RepositorySystemSession, List)

resolveArtifacts

List<ArtifactResult> resolveArtifacts(RepositorySystemSession session,
 Collection<? extends ArtifactRequest> requests)
                               throws ArtifactResolutionException

Resolves the paths for a collection of artifacts. Artifacts will be downloaded to the local repository if necessary. Artifacts that are already resolved will be skipped and are not re-resolved. In general, callers must not assume any relationship between an artifact's filename and its coordinates. Note that this method assumes that any relocations have already been processed.

Parameters:

session - The repository session, must not be null.

requests - The resolution requests, must not be null.

Returns:

The resolution results (in request order), never null.

Throws:

ArtifactResolutionException - If any artifact could not be resolved.

See Also:

• Artifact.getFile()
• newResolutionRepositories(RepositorySystemSession, List)

resolveMetadata

List<MetadataResult> resolveMetadata(RepositorySystemSession session,
 Collection<? extends MetadataRequest> requests)

Resolves the paths for a collection of metadata. Metadata will be downloaded to the local repository if necessary, e.g. because it hasn't been cached yet or the cache is deemed outdated.

Parameters:

session - The repository session, must not be null.

requests - The resolution requests, must not be null.

Returns:

The resolution results (in request order), never null.

See Also:

• Metadata.getFile()
• newResolutionRepositories(RepositorySystemSession, List)

install

InstallResult install(RepositorySystemSession session,
 InstallRequest request)
               throws InstallationException

Installs a collection of artifacts and their accompanying metadata to the local repository.

Parameters:

session - The repository session, must not be null.

request - The installation request, must not be null.

Returns:

The installation result, never null.

Throws:

InstallationException - If any artifact/metadata from the request could not be installed.

deploy

DeployResult deploy(RepositorySystemSession session,
 DeployRequest request)
             throws DeploymentException

Uploads a collection of artifacts and their accompanying metadata to a remote repository.

Parameters:

session - The repository session, must not be null.

request - The deployment request, must not be null.

Returns:

The deployment result, never null.

Throws:

DeploymentException - If any artifact/metadata from the request could not be deployed.

See Also:

• newDeploymentRepository(RepositorySystemSession, RemoteRepository)

newLocalRepositoryManager

LocalRepositoryManager newLocalRepositoryManager(RepositorySystemSession session,
 LocalRepository localRepository)

Creates a new manager for the specified local repository. If the specified local repository has no type, the default local repository type of the system will be used. Note: It is expected that this method invocation is one of the last steps of setting up a new session, in particular any configuration properties should have been set already.

Parameters:

session - The repository system session from which to configure the manager, must not be null.

localRepository - The local repository to create a manager for, must not be null.

Returns:

The local repository manager, never null.

Throws:

IllegalArgumentException - If the specified repository type is not recognized or no base directory is given.

newSyncContext

SyncContext newSyncContext(RepositorySystemSession session,
 boolean shared)

Creates a new synchronization context.

Parameters:

session - The repository session during which the context will be used, must not be null.

shared - A flag indicating whether access to the artifacts/metadata associated with the new context can be shared among concurrent readers or whether access needs to be exclusive to the calling thread.

Returns:

The synchronization context, never null.

newResolutionRepositories

List<RemoteRepository> newResolutionRepositories(RepositorySystemSession session,
 List<RemoteRepository> repositories)

Forms remote repositories suitable for artifact resolution by applying the session's authentication selector and similar network configuration to the given repository prototypes. As noted for RepositorySystemSession.getAuthenticationSelector() etc. the remote repositories passed to e.g. resolveArtifact() are used as is and expected to already carry any required authentication or proxy configuration. This method can be used to apply the authentication/proxy configuration from a session to a bare repository definition to obtain the complete repository definition for use in the resolution request.

Parameters:

session - The repository system session from which to configure the repositories, must not be null.

repositories - The repository prototypes from which to derive the resolution repositories, must not be null or contain null elements.

Returns:

The resolution repositories, never null. Note that there is generally no 1:1 relationship of the obtained repositories to the original inputs due to mirror selection potentially aggregating multiple repositories.

See Also:

• newDeploymentRepository(RepositorySystemSession, RemoteRepository)

newDeploymentRepository

RemoteRepository newDeploymentRepository(RepositorySystemSession session,
 RemoteRepository repository)

Forms a remote repository suitable for artifact deployment by applying the session's authentication selector and similar network configuration to the given repository prototype. As noted for RepositorySystemSession.getAuthenticationSelector() etc. the remote repository passed to deploy() is used as is and expected to already carry any required authentication or proxy configuration. This method can be used to apply the authentication/proxy configuration from a session to a bare repository definition to obtain the complete repository definition for use in the deployment request.

Parameters:

session - The repository system session from which to configure the repository, must not be null.

repository - The repository prototype from which to derive the deployment repository, must not be null.

Returns:

The deployment repository, never null.

See Also:

• newResolutionRepositories(RepositorySystemSession, List)

addOnSystemEndedHandler

void addOnSystemEndedHandler(Runnable handler)

Registers an "on repository system end" handler, executed after repository system is shut down.

Parameters:

handler - The handler, must not be null.

Since:

1.9.0

createSessionBuilder

RepositorySystemSession.SessionBuilder createSessionBuilder()

Creates a brand-new session builder instance that produces "top level" (root) session. Top level sessions are associated with its creator RepositorySystem instance, and may be used only with that given instance and only within the lifespan of it, and after use should be closed.

Since:

2.0.0

shutdown

void shutdown()

Signals to repository system to shut down. Shut down instance is not usable anymore.

Repository system may perform some resource cleanup, if applicable. Not using this method may cause leaks or unclean shutdown of some subsystem.

When shutdown happens, all the registered on-close handlers will be invoked (even if some throws), and at end of operation a MultiRuntimeException may be thrown, signaling that some handler(s) failed. This exception may be ignored, is at the discretion of caller.

Since:

1.9.0

close

default void close()

Closes this instance, invokes shutdown().

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Since:

2.0.0