Package com.launchdarkly.sdk.server.migrations

Class Migration<TReadResult,TWriteResult,TReadInput,TWriteInput>

java.lang.Object

com.launchdarkly.sdk.server.migrations.Migration<TReadResult,TWriteResult,TReadInput,TWriteInput>

Type Parameters:

TReadResult - The result type for reads.

TWriteResult - The result type for writes.

TReadInput - The input parameter type for reads.

TWriteInput - The input type for writes.

public final class Migration<TReadResult,TWriteResult,TReadInput,TWriteInput>
extends java.lang.Object

Class for performing a technology migration.

This class is not intended to be instanced directly, but instead should be constructed using the MigrationBuilder.

The thread safety model for a migration depends on the usage of thread-safe elements. Specifically the tracker, the client, and the thread pool should be thread-safe. Other elements of the migration instance itself are immutable for their thread-safety.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	Migration.Method<UInput,UOutput>
static class	Migration.MigrationResult<TResult>	This class represents the result of a migration operation.
static class	Migration.MigrationWriteResult<TWriteResult>	The result of a migration write.
static interface	Migration.ReadConsistencyChecker<TReadResult>	This interface defines a method for checking the consistency of two reads.
static interface	Migration.Reader<TReadInput,TReadResult>	This interface defines a read method.
static interface	Migration.Writer<TWriteInput,TWriteResult>	This interfaces defines a write method.

Method Summary

Modifier and Type	Method	Description
Migration.MigrationResult<TReadResult>	read(java.lang.String key, LDContext context, MigrationStage defaultStage)	Execute a migration based read.
Migration.MigrationResult<TReadResult>	read(java.lang.String key, LDContext context, MigrationStage defaultStage, TReadInput payload)	Execute a migration based read with a payload.
Migration.MigrationWriteResult<TWriteResult>	write(java.lang.String key, LDContext context, MigrationStage defaultStage)	Execute a migration based write.
Migration.MigrationWriteResult<TWriteResult>	write(java.lang.String key, LDContext context, MigrationStage defaultStage, TWriteInput payload)	Execute a migration based write with a payload.

Methods inherited from class java.lang.Object

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

Method Detail

read

@NotNull
public Migration.MigrationResult<TReadResult> read(@NotNull
                                                   java.lang.String key,
                                                   @NotNull
                                                   LDContext context,
                                                   @NotNull
                                                   MigrationStage defaultStage,
                                                   @Nullable
                                                   TReadInput payload)

Execute a migration based read with a payload.

To execute a read without a payload use read(String, LDContext, MigrationStage).

Parameters:

key - the flag key of migration flag

context - the context for the migration

defaultStage - the default migration stage

payload - an optional payload that will be passed to the new/old read implementations

Returns:

the result of the read

read

@NotNull
public Migration.MigrationResult<TReadResult> read(@NotNull
                                                   java.lang.String key,
                                                   @NotNull
                                                   LDContext context,
                                                   @NotNull
                                                   MigrationStage defaultStage)

Execute a migration based read.

To execute a read with a payload use read(String, LDContext, MigrationStage, Object).

Parameters:

key - the flag key of migration flag

context - the context for the migration

defaultStage - the default migration stage

Returns:

the result of the read

write

@NotNull
public Migration.MigrationWriteResult<TWriteResult> write(@NotNull
                                                          java.lang.String key,
                                                          @NotNull
                                                          LDContext context,
                                                          @NotNull
                                                          MigrationStage defaultStage,
                                                          @Nullable
                                                          TWriteInput payload)

Execute a migration based write with a payload.

To execute a write without a payload use write(String, LDContext, MigrationStage).

Parameters:

key - the flag key of migration flag

context - the context for the migration

defaultStage - the default migration stage

payload - an optional payload that will be passed to the new/old write implementations

Returns:

the result of the write

write

@NotNull
public Migration.MigrationWriteResult<TWriteResult> write(@NotNull
                                                          java.lang.String key,
                                                          @NotNull
                                                          LDContext context,
                                                          @NotNull
                                                          MigrationStage defaultStage)

Execute a migration based write.

To execute a read with a payload use write(String, LDContext, MigrationStage, Object).

Parameters:

key - the flag key of migration flag

context - the context for the migration

defaultStage - the default migration stage

Returns:

the result of the write