Package convex.core

Class Block

java.lang.Object

convex.core.data.AObject

convex.core.data.ACell

convex.core.data.ACountable<MapEntry<Keyword,ACell>>

convex.core.data.ADataStructure<MapEntry<Keyword,ACell>>

convex.core.data.AMap<Keyword,ACell>

convex.core.data.ARecord

convex.core.Block

All Implemented Interfaces:

IAssociative<Keyword,ACell>, IValidated, IWriteable, Map<Keyword,ACell>

public final class Block
extends ARecord

A Block contains an ordered collection of signed transactions that may be applied collectively as part of a state update. Blocks represent the units of novelty in the consensus system: a future state is 100% deterministic given the previous state and the Block to be applied. "Man, the living creature, the creating individual, is always more important than any established style or system." - Bruce Lee

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Field Summary

Fields inherited from class convex.core.data.ARecord

DEFAULT_VALUE

Fields inherited from class convex.core.data.ADataStructure

count

Fields inherited from class convex.core.data.ACell

cachedRef, memorySize

Fields inherited from class convex.core.data.AObject

encoding

Method Summary

Modifier and Type	Method	Description
static Block	create(long timestamp, AVector<SignedData<ATransaction>> transactions)	Creates a block with the given transactions.
static Block	create(long timestamp, List<SignedData<ATransaction>> transactions)	Creates a block with the given timestamp and transactions
int	encode(byte[] bs, int pos)	Writes this Cell's encoding to a byte array, including a tag byte which will be written first.
int	encodeRaw(byte[] bs, int pos)	Writes this Cell's encoding to a byte array, excluding the tag byte.
boolean	equals(Block a)	Tests if this Block is equal to another
boolean	equals(ACell a)	Checks for equality with another Cell.
int	estimatedEncodingSize()	Estimate the encoded data size for this Cell.
ACell	get(Keyword k)	Gets the record field content for a given key, or null if not found.
RecordFormat	getFormat()	Gets the RecordFormat instance that describes this Record's layout
<R extends ACell> Ref<R>	getRef(int i)	Gets a numbered child Ref from within this Cell.
int	getRefCount()	Gets the number of Refs contained within this Cell.
byte	getTag()	Gets the tag byte for this record type.
long	getTimeStamp()	Gets the timestamp of this block
AVector<SignedData<ATransaction>>	getTransactions()	Get the vector of transactions in this Block
boolean	isCanonical()	Returns true if this Cell is in a canonical representation.
boolean	isCVMValue()	Returns true if this cell is a first class CVM Value allowable in the CVM state Sub-structural cells that are not themselves first class values should return false Records and types that are not permissible on the CVM should return false.
int	length()	Gets the length of this block in number of transactions
static Block	of(long timestamp, SignedData<ATransaction>... transactions)	Creates a block with the given transactions.
static Block	read(Blob b, int pos)	Read a Block from a Blob encoding
Block	updateRefs(IRefFunction func)	Updates all Refs in this object using the given function.
void	validateCell()	Validates the local structure and invariants of this cell.

Methods inherited from class convex.core.data.ARecord

accumulateEntrySet, accumulateKeySet, accumulateValues, assoc, assocEntry, containsKey, containsValue, dissoc, dissoc, empty, entryAt, entrySet, forEach, get, getEntry, getEntryByHash, getKeyRefEntry, getKeys, getType, getValuesArray, keySet, reduceEntries, reduceValues, toCanonical, toHashMap, values

Methods inherited from class convex.core.data.AMap

clear, conj, containsKey, containsKeyRef, containsValue, entryVector, filterValues, get, get, get, getElementRef, merge, print, put, putAll, remove, slice, slice

Methods inherited from class convex.core.data.ADataStructure

checkIndex, conjAll, count, isDataValue, isEmpty, size, toCVMString

Methods inherited from class convex.core.data.ACell

attachMemorySize, attachRef, cachedEncoding, cachedHash, calcMemorySize, createEncoding, createRef, equals, genericEquals, getCanonical, getChildRefs, getEncoding, getEncodingLength, getHash, getMemorySize, getMemorySize, getRef, hashCode, isEmbedded, toString, validate

Methods inherited from class convex.core.data.AObject

attachEncoding, print, print

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, equals, getOrDefault, hashCode, isEmpty, merge, putIfAbsent, remove, replace, replace, replaceAll, size

Method Details

get

public ACell get(Keyword k)

Description copied from class: ARecord

Gets the record field content for a given key, or null if not found.

Specified by:

get in class ARecord

Parameters:

k - Key to look up in this record

Returns:

Field value for the given key

updateRefs

public Block updateRefs(IRefFunction func)

Description copied from class: ACell

Updates all Refs in this object using the given function. The function *must not* change the hash value of Refs, in order to ensure structural integrity of modified data structures. The implementation *should* re-attach any original encoding in order to prevent re-encoding or surplus hashing This is a building block for a very sneaky trick that enables use to do a lot of efficient operations on large trees of smart references. Must return the same object if no Refs are altered.

Overrides:

updateRefs in class ACell

Parameters:

func - Ref update function

Returns:

Cell with updated Refs

getTimeStamp

public long getTimeStamp()

Gets the timestamp of this block

Returns:

Timestamp, as a long value

create

public static Block create(long timestamp,
 List<SignedData<ATransaction>> transactions)

Creates a block with the given timestamp and transactions

Parameters:

timestamp - Timestamp for the newly created Block.

transactions - A java.util.List instance containing the required transactions

Returns:

A new Block containing the specified signed transactions

create

public static Block create(long timestamp,
 AVector<SignedData<ATransaction>> transactions)

Creates a block with the given transactions.

Parameters:

timestamp - Timestamp of block creation, according to Peer

transactions - Vector of transactions to include in Block

Returns:

A new Block containing the specified signed transactions

of

@SafeVarargs
public static Block of(long timestamp,
 SignedData<ATransaction>... transactions)

Creates a block with the given transactions.

Parameters:

timestamp - Timestamp of block creation, according to Peer

transactions - Array of transactions to include in Block

Returns:

New Block

length

public int length()

Gets the length of this block in number of transactions

Returns:

Number of transactions on this block

encode

public int encode(byte[] bs,
 int pos)

Description copied from class: ACell

Writes this Cell's encoding to a byte array, including a tag byte which will be written first. Cell must be canonical, or else an error may occur.

Specified by:

encode in interface IWriteable

Specified by:

encode in class ACell

Parameters:

bs - A byte array to which to write the encoding

pos - The offset into the byte array

Returns:

New position after writing

encodeRaw

public int encodeRaw(byte[] bs,
 int pos)

Description copied from class: ACell

Writes this Cell's encoding to a byte array, excluding the tag byte.

Specified by:

encodeRaw in class ACell

Parameters:

bs - A byte array to which to write the encoding

pos - The offset into the byte array

Returns:

New position after writing

estimatedEncodingSize

public int estimatedEncodingSize()

Description copied from interface: IWriteable

Estimate the encoded data size for this Cell. Used for quickly sizing buffers. Implementations should try to return a size that is highly likely to contain the entire object when encoded, including the tag byte. Should not traverse soft Refs, i.e. must be usable on arbitrary partial data structures

Specified by:

estimatedEncodingSize in interface IWriteable

Overrides:

estimatedEncodingSize in class ARecord

Returns:

The estimated size for the binary representation of this object.

read

public static Block read(Blob b,
 int pos)
                  throws BadFormatException

Read a Block from a Blob encoding

Throws:

BadFormatException - In event of encoding error

getTransactions

public AVector<SignedData<ATransaction>> getTransactions()

Get the vector of transactions in this Block

Returns:

Vector of transactions

isCanonical

public boolean isCanonical()

Description copied from class: ACell

Returns true if this Cell is in a canonical representation. Non-canonical objects may be used on a temporary internal basis, they should be converted to canonical representations for general purpose use.

Overrides:

isCanonical in class ARecord

Returns:

true if the object is in canonical format, false otherwise

getTag

public byte getTag()

Description copied from class: ARecord

Gets the tag byte for this record type. The Tag is the byte used to identify the record in the binary encoding.

Specified by:

getTag in class ARecord

Returns:

Record tag byte

validateCell

public void validateCell()
                  throws InvalidDataException

Description copied from class: ACell

Validates the local structure and invariants of this cell. Called by validate() super implementation. Should validate directly contained data, but should not validate all other structure of this cell. In particular, should not traverse potentially missing child Refs.

Specified by:

validateCell in class ACell

Throws:

InvalidDataException - If the Cell is invalid

equals

public boolean equals(ACell a)

Description copied from class: ACell

Checks for equality with another Cell. In general, Cells are considered equal if they have the same canonical representation, i.e. an identical encoding with the same hash value. Subclasses SHOULD override this if they have a more efficient equals implementation. MUST NOT require reads from Store.

Specified by:

equals in class ACell

Parameters:

a - Cell to compare with. May be null.

Returns:

True if this cell is equal to the other object

equals

public boolean equals(Block a)

Tests if this Block is equal to another

Parameters:

a - PeerStatus to compare with

Returns:

true if equal, false otherwise

isCVMValue

public boolean isCVMValue()

Description copied from class: ACell

Returns true if this cell is a first class CVM Value allowable in the CVM state Sub-structural cells that are not themselves first class values should return false Records and types that are not permissible on the CVM should return false. Pretty much everything else should return true. Note: CVM values might not be in a canonical format, e.g. temporary data structures

Overrides:

isCVMValue in class ARecord

Returns:

true if the object is a CVM Value, false otherwise

getRefCount

public int getRefCount()

Description copied from class: ACell

Gets the number of Refs contained within this Cell. This number is final / immutable for any given instance and is defined by the Cell encoding rules. Contained Refs may be either external or embedded.

Overrides:

getRefCount in class ACell

Returns:

The number of Refs in this Cell

getRef

public <R extends ACell> Ref<R> getRef(int i)

Description copied from class: ACell

Gets a numbered child Ref from within this Cell. WARNING: May need to convert to a canonical instance

Overrides:

getRef in class ACell

Type Parameters:

R - Type of referenced Cell

Parameters:

i - Index of ref to get

Returns:

The Ref at the specified index

getFormat

public RecordFormat getFormat()

Description copied from class: ARecord

Gets the RecordFormat instance that describes this Record's layout

Specified by:

getFormat in class ARecord

Returns:

RecordFormat instance