Package org.nuxeo.runtime.migration

Class MigrationServiceImpl

java.lang.Object

org.nuxeo.runtime.model.DefaultComponent

org.nuxeo.runtime.migration.MigrationServiceImpl

All Implemented Interfaces:

MigrationService, Adaptable, Component, Extensible, TimestampedService

public class MigrationServiceImpl
extends DefaultComponent
implements MigrationService

Implementation for the Migration Service.

Data about migration status is stored in the "migration" Key/Value Store in the following format:

 mymigration:lock         write lock, containing debug info about locker; set with a TTL
 mymigration              the state of the migration, if not running
 mymigration:step         the step of the migration, if running
 mymigration:starttime    the migration step start time (milliseconds since epoch)
 mymigration:pingtime     the migration step last ping time (milliseconds since epoch)
 mymigration:message      the migration step current message
 mymigration:num          the migration step current num
 mymigration:total        the migration step current total
 

Since:

9.3

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	MigrationServiceImpl.InvalidatorMigrator	A migrator wrapper to send invalidations to other nodes when calling MigrationServiceImpl.InvalidatorMigrator.notifyStatusChange().
protected static class	MigrationServiceImpl.MigrationContextImpl	Migration context implementation that reports progress in the key/value store and can be shutdown.
static class	MigrationServiceImpl.MigrationInvalidation
class	MigrationServiceImpl.MigrationInvalidator
protected static class	MigrationServiceImpl.MigrationThreadPoolExecutor	Thread pool executor that records Runnables to be able to request shutdown on them.
protected static class	MigrationServiceImpl.MigratorWithContext	Runnable for the migrator, that knows about the migration context.
protected static class	MigrationServiceImpl.ProgressReporter	Progress reporter that reports progress in the key/value store.

Nested classes/interfaces inherited from interface org.nuxeo.runtime.migration.MigrationService

MigrationService.MigrationContext, MigrationService.MigrationStatus, MigrationService.Migrator

Field Summary

Fields

Modifier and Type	Field	Description
static final String	ERROR_CODE
static final String	ERROR_MESSAGE
protected MigrationServiceImpl.MigrationThreadPoolExecutor	executor
protected MigrationServiceImpl.MigrationInvalidator	invalidator
static final String	KEYVALUE_STORE_NAME
static final String	LOCK
static final String	MIGRATION_INVAL_PUBSUB_TOPIC
protected String	nodeId
static final String	PING_TIME
static final String	PROGRESS_MESSAGE
static final String	PROGRESS_NUM
static final String	PROGRESS_TOTAL
protected static final Random	RANDOM
static final String	START_TIME
static final String	STEP
static final long	WRITE_LOCK_TTL
static final String	XP_CONFIG

Fields inherited from class org.nuxeo.runtime.model.DefaultComponent

lastModified, name

Constructor Summary

Constructors

Constructor	Description
MigrationServiceImpl()

Method Summary

Modifier and Type	Method	Description
protected void	atomic(String id, Consumer<KeyValueStore> consumer)	Executes something while setting a lock, retrying a few times if the lock is already set.
int	getApplicationStartedOrder()	The component notification order for Component.start(ComponentContext).
protected static KeyValueStore	getKeyValueStore()
Migration	getMigration(String id)	Gets a migration object.
Collection<MigrationDescriptor>	getMigrationDescriptors()
List<Migration>	getMigrations()	Gets all the migration objects.
MigrationService.Migrator	getMigrator(String id)
MigrationService.MigrationStatus	getStatus(String id)	Gets the current status for a migration.
protected long	parseLong(KeyValueStore kv, String key)
void	probeAndRun(String id)	Probes the migration state and runs a migration.
String	probeAndSetState(String id)	Probes the current state of a migration by analyzing persistent data, and sets it as the new current state.
void	restartExecutor()	Restart the executor thread, only for testing purpose.
void	runStep(String id, String step)	Runs a migration step for a migration.
protected void	runStep(String id, String step, boolean resume)
protected void	setState(String id, String state, MigrationService.Migrator migrator, MigrationServiceImpl.ProgressReporter progressReporter)
protected void	setState(String id, String state, MigrationServiceImpl.ProgressReporter progressReporter, KeyValueStore kv)
void	start(ComponentContext context)	Start the component.
void	stop(ComponentContext context)	Stop the component.

Methods inherited from class org.nuxeo.runtime.model.DefaultComponent

activate, addRuntimeMessage, addRuntimeMessage, deactivate, getAdapter, getDescriptor, getDescriptors, getLastModified, getRegistry, register, registerContribution, registerExtension, setLastModified, setModifiedNow, setName, unregister, unregisterContribution, unregisterExtension

Methods inherited from class java.lang.Object

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

Field Details

KEYVALUE_STORE_NAME

public static final String KEYVALUE_STORE_NAME

See Also:

• Constant Field Values

XP_CONFIG

public static final String XP_CONFIG

See Also:

• Constant Field Values

LOCK

public static final String LOCK

See Also:

• Constant Field Values

STEP

public static final String STEP

See Also:

• Constant Field Values

START_TIME

public static final String START_TIME

See Also:

• Constant Field Values

PING_TIME

public static final String PING_TIME

See Also:

• Constant Field Values

ERROR_MESSAGE

public static final String ERROR_MESSAGE

See Also:

• Constant Field Values

ERROR_CODE

public static final String ERROR_CODE

See Also:

• Constant Field Values

PROGRESS_MESSAGE

public static final String PROGRESS_MESSAGE

See Also:

• Constant Field Values

PROGRESS_NUM

public static final String PROGRESS_NUM

See Also:

• Constant Field Values

PROGRESS_TOTAL

public static final String PROGRESS_TOTAL

See Also:

• Constant Field Values

WRITE_LOCK_TTL

public static final long WRITE_LOCK_TTL

See Also:

• Constant Field Values

MIGRATION_INVAL_PUBSUB_TOPIC

public static final String MIGRATION_INVAL_PUBSUB_TOPIC

See Also:

• Constant Field Values

RANDOM

protected static final Random RANDOM

executor

protected MigrationServiceImpl.MigrationThreadPoolExecutor executor

nodeId

protected String nodeId

invalidator

protected MigrationServiceImpl.MigrationInvalidator invalidator

Constructor Details

MigrationServiceImpl

public MigrationServiceImpl()

Method Details

getKeyValueStore

protected static KeyValueStore getKeyValueStore()

getMigrationDescriptors

public Collection<MigrationDescriptor> getMigrationDescriptors()

getApplicationStartedOrder

public int getApplicationStartedOrder()

Description copied from interface: Component

The component notification order for Component.start(ComponentContext).

Components are notified in increasing order. Order 1000 is the default order for components that don't care. Order 100 is the repository initialization.

Specified by:

getApplicationStartedOrder in interface Component

Returns:

the order, 1000 by default

start

public void start(ComponentContext context)

Description copied from interface: Component

Start the component. This method is called after all the components were resolved and activated

Specified by:

start in interface Component

Overrides:

start in class DefaultComponent

stop

public void stop(ComponentContext context)
          throws InterruptedException

Description copied from interface: Component

Stop the component.

Specified by:

stop in interface Component

Overrides:

stop in class DefaultComponent

Throws:

InterruptedException

getStatus

public MigrationService.MigrationStatus getStatus(String id)

Description copied from interface: MigrationService

Gets the current status for a migration.

Specified by:

getStatus in interface MigrationService

Parameters:

id - the migration id

Returns:

the status, or null if the migration is unknown

parseLong

protected long parseLong(KeyValueStore kv,
 String key)

probeAndSetState

public String probeAndSetState(String id)

Description copied from interface: MigrationService

Probes the current state of a migration by analyzing persistent data, and sets it as the new current state.

THIS METHOD MAY TAKE A WHILE as it needs to get information from persistent storage.

Specified by:

probeAndSetState in interface MigrationService

Parameters:

id - the migration id

Returns:

the new state, or null if it cannot be determined

setState

protected void setState(String id,
 String state,
 MigrationService.Migrator migrator,
 MigrationServiceImpl.ProgressReporter progressReporter)

setState

protected void setState(String id,
 String state,
 MigrationServiceImpl.ProgressReporter progressReporter,
 KeyValueStore kv)

runStep

public void runStep(String id,
 String step)

Description copied from interface: MigrationService

Runs a migration step for a migration.

This launches the migration asynchronously. The status of the migration can be checked with MigrationService.getStatus(java.lang.String).

Specified by:

runStep in interface MigrationService

Parameters:

id - the migration id

step - the step id

runStep

protected void runStep(String id,
 String step,
 boolean resume)

getMigrator

public MigrationService.Migrator getMigrator(String id)

atomic

protected void atomic(String id,
 Consumer<KeyValueStore> consumer)

Executes something while setting a lock, retrying a few times if the lock is already set.

getMigration

public Migration getMigration(String id)

Description copied from interface: MigrationService

Gets a migration object.

Specified by:

getMigration in interface MigrationService

Parameters:

id - the migration id

Returns:

the migration, or null if the migration is unknown

getMigrations

public List<Migration> getMigrations()

Description copied from interface: MigrationService

Gets all the migration objects.

Specified by:

getMigrations in interface MigrationService

Returns:

a list of all migrations

probeAndRun

public void probeAndRun(String id)

Description copied from interface: MigrationService

Probes the migration state and runs a migration.

THIS METHOD MAY TAKE A WHILE as it may call MigrationService.probeAndSetState(String).

Specified by:

probeAndRun in interface MigrationService

Parameters:

id - the migration id

Implementation Note:

Runs a migration if it has exactly one available step to run.

restartExecutor

public void restartExecutor()
                     throws InterruptedException

Restart the executor thread, only for testing purpose.

Throws:

InterruptedException

Since:

2023.5