Package com.google.gerrit.server.update

Class ChainedReceiveCommands

java.lang.Object

com.google.gerrit.server.update.ChainedReceiveCommands

All Implemented Interfaces:

RefCache

public class ChainedReceiveCommands
extends Object
implements RefCache

Collection of ReceiveCommands that supports multiple updates per ref.

The underlying behavior of BatchRefUpdate is undefined (an implementations vary) when more than one command per ref is added. This class works around that limitation by allowing multiple updates per ref, as long as the previous new SHA-1 matches the next old SHA-1.

Constructor Summary

Constructors

Constructor	Description
ChainedReceiveCommands(RepoRefCache refCache)
ChainedReceiveCommands(org.eclipse.jgit.lib.Repository repo)

Method Summary

Modifier and Type	Method	Description
void	add(org.eclipse.jgit.transport.ReceiveCommand cmd)	Add a command.
void	addTo(org.eclipse.jgit.lib.BatchRefUpdate bru)	Add commands from this instance to a native JGit batch update.
void	close()	Closes this cache, releasing the references to any underlying resources.
Optional<org.eclipse.jgit.lib.ObjectId>	get(String refName)	Get the latest value of a ref according to this sequence of commands.
Map<String,org.eclipse.jgit.transport.ReceiveCommand>	getCommands()	Returns an unmodifiable view of commands.
RepoRefCache	getRepoRefCache()
boolean	isEmpty()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ChainedReceiveCommands

public ChainedReceiveCommands(org.eclipse.jgit.lib.Repository repo)

ChainedReceiveCommands

public ChainedReceiveCommands(RepoRefCache refCache)

Method Detail

getRepoRefCache

public RepoRefCache getRepoRefCache()

isEmpty

public boolean isEmpty()

add

public void add(org.eclipse.jgit.transport.ReceiveCommand cmd)

Add a command.

Parameters:

cmd - command to add. If a command has been previously added for the same ref, the new SHA-1 of the most recent previous command must match the old SHA-1 of this command.

get

public Optional<org.eclipse.jgit.lib.ObjectId> get(String refName)
                                            throws IOException

Get the latest value of a ref according to this sequence of commands.

After the value for a ref is read from the repo once, it is cached as in RepoRefCache.

Specified by:

get in interface RefCache

Parameters:

refName - name of the ref.

Returns:

value of the ref; absent if the ref does not exist in the repo. Never null, and never present with a value of ObjectId.zeroId().

Throws:

IOException

See Also:

RefCache.get(String)

addTo

public void addTo(org.eclipse.jgit.lib.BatchRefUpdate bru)

Add commands from this instance to a native JGit batch update.

Exactly one command per ref will be added to the update. The old SHA-1 will be the old SHA-1 of the first command added to this instance for that ref; the new SHA-1 will be the new SHA-1 of the last command.

Parameters:

bru - batch update

getCommands

public Map<String,org.eclipse.jgit.transport.ReceiveCommand> getCommands()

Returns an unmodifiable view of commands.

close

public void close()

Description copied from interface: RefCache

Closes this cache, releasing the references to any underlying resources.

Specified by:

close in interface RefCache