TraceId (opencensus-api 0.9.0 API)

java.lang.Object
- io.opencensus.trace.TraceId

All Implemented Interfaces:

Comparable<TraceId>
```
@Immutable
public final class TraceId
extends Object
implements Comparable<TraceId>
```
A class that represents a trace identifier. A valid trace identifier is a 16-byte array with at least one non-zero byte.

Field Summary

Fields
Modifier and Type Field and Description

static TraceId INVALID
The invalid TraceId.

static int SIZE
The size in bytes of the TraceId.

Fields
Modifier and Type	Field and Description
`static TraceId`	`INVALID` The invalid `TraceId`.
`static int`	`SIZE` The size in bytes of the `TraceId`.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`int`	`compareTo(TraceId that)`
`void`	`copyBytesTo(byte[] dest, int destOffset)` Copies the byte array representations of the `TraceId` into the `dest` beginning at the `destOffset` offset.
`boolean`	`equals(Object obj)`
`static TraceId`	`fromBytes(byte[] buffer)` Returns a `TraceId` built from a byte representation.
`static TraceId`	`fromBytes(byte[] src, int srcOffset)` Returns a `TraceId` whose representation is copied from the `src` beginning at the `srcOffset` offset.
`static TraceId`	`generateRandomId(Random random)` Generates a new random `TraceId`.
`byte[]`	`getBytes()` Returns the 16-bytes array representation of the `TraceId`.
`long`	`getLowerLong()` Returns the lower 8 bytes of the trace-id as a long value, assuming little-endian order.
`int`	`hashCode()`
`boolean`	`isValid()` Returns whether the `TraceId` is valid.
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - SIZE
```
public static final int SIZE
```
    The size in bytes of the TraceId.
    
    See Also:
    
    Constant Field Values
  - INVALID
```
public static final TraceId INVALID
```
    The invalid TraceId. All bytes are '\0'.
- Method Detail
  - fromBytes
```
public static TraceId fromBytes(byte[] buffer)
```
    Returns a TraceId built from a byte representation.
    Equivalent with:
```
 TraceId.fromBytes(buffer, 0);
 
```
    Parameters:
    
    buffer - the representation of the TraceId.
    
    Returns:
    
    a TraceId whose representation is given by the buffer parameter.
    
    Throws:
    
    NullPointerException - if buffer is null.
    
    IllegalArgumentException - if buffer.length is not SIZE.
  - fromBytes
```
public static TraceId fromBytes(byte[] src,
                                int srcOffset)
```
    Returns a TraceId whose representation is copied from the src beginning at the srcOffset offset.
    
    Parameters:
    
    src - the buffer where the representation of the TraceId is copied.
    
    srcOffset - the offset in the buffer where the representation of the TraceId begins.
    
    Returns:
    
    a TraceId whose representation is copied from the buffer.
    
    Throws:
    
    NullPointerException - if src is null.
    
    IndexOutOfBoundsException - if srcOffset+TraceId.SIZE is greater than src.length.
  - generateRandomId
```
public static TraceId generateRandomId(Random random)
```
    Generates a new random TraceId.
    
    Parameters:
    
    random - the random number generator.
    
    Returns:
    
    a new valid TraceId.
  - getBytes
```
public byte[] getBytes()
```
    Returns the 16-bytes array representation of the TraceId.
    
    Returns:
    
    the 16-bytes array representation of the TraceId.
  - copyBytesTo
```
public void copyBytesTo(byte[] dest,
                        int destOffset)
```
    Copies the byte array representations of the TraceId into the dest beginning at the destOffset offset.
    Equivalent with (but faster because it avoids any new allocations):
```
 System.arraycopy(getBytes(), 0, dest, destOffset, TraceId.SIZE);
 
```
    Parameters:
    
    dest - the destination buffer.
    
    destOffset - the starting offset in the destination buffer.
    
    Throws:
    
    NullPointerException - if dest is null.
    
    IndexOutOfBoundsException - if destOffset+TraceId.SIZE is greater than dest.length.
  - isValid
```
public boolean isValid()
```
    Returns whether the TraceId is valid. A valid trace identifier is a 16-byte array with at least one non-zero byte.
    
    Returns:
    
    true if the TraceId is valid.
  - getLowerLong
```
@Internal
public long getLowerLong()
```
    Returns the lower 8 bytes of the trace-id as a long value, assuming little-endian order. This is used in ProbabilitySampler.
    This method is marked as internal and subject to change.
    
    Returns:
    
    the lower 8 bytes of the trace-id as a long value, assuming little-endian order.
  - equals
```
public boolean equals(Object obj)
```
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
  - compareTo
```
public int compareTo(TraceId that)
```
    Specified by:
    
    compareTo in interface Comparable<TraceId>

Class TraceId

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

SIZE

INVALID

Method Detail

fromBytes

fromBytes

generateRandomId

getBytes

copyBytesTo

isValid

getLowerLong

equals

hashCode

toString

compareTo