com.scalar.dl.ledger.statemachine

Class StringBasedAssetLedger

java.lang.Object

com.scalar.dl.ledger.statemachine.StringBasedAssetLedger

All Implemented Interfaces:

Ledger<java.lang.String>

@ThreadSafe
public class StringBasedAssetLedger
extends java.lang.Object
implements Ledger<java.lang.String>

Constructor Summary

Constructors

Constructor and Description
StringBasedAssetLedger(TamperEvidentAssetLedger ledger)

Method Summary

Modifier and Type	Method and Description
java.util.Optional<Asset<java.lang.String>>	get(java.lang.String assetId) Retrieves the latest Asset entry (an asset entry with the largest age) from the ledger with the specified asset ID.
void	put(java.lang.String assetId, java.lang.String data) Creates/Appends an Asset entry to the ledger.
java.util.List<Asset<java.lang.String>>	scan(AssetFilter filter) Retrieves a list of Asset entries from the ledger with the specified AssetFilter.

Methods inherited from class java.lang.Object

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

Constructor Detail

StringBasedAssetLedger

public StringBasedAssetLedger(TamperEvidentAssetLedger ledger)

Method Detail

get

public java.util.Optional<Asset<java.lang.String>> get(java.lang.String assetId)

Description copied from interface: Ledger

Retrieves the latest Asset entry (an asset entry with the largest age) from the ledger with the specified asset ID.

Specified by:

get in interface Ledger<java.lang.String>

Parameters:

assetId - an asset ID

Returns:

an Optional with the returned asset

scan

public java.util.List<Asset<java.lang.String>> scan(AssetFilter filter)

Description copied from interface: Ledger

Retrieves a list of Asset entries from the ledger with the specified AssetFilter.

Specified by:

scan in interface Ledger<java.lang.String>

Parameters:

filter - a condition to filter asset

Returns:

a list of asset entries which passed the filtering

put

public void put(java.lang.String assetId,
                java.lang.String data)

Description copied from interface: Ledger

Creates/Appends an Asset entry to the ledger. The initial entry is marked as age 0 and new entry is appended with an incremented age.

Specified by:

put in interface Ledger<java.lang.String>

Parameters:

assetId - an asset ID to create/append

data - asset data