PostgreSQL JDBC Driver 42.7.2 · org.postgresql.replication.LogSequenceNumber

Modifier and Type	Field and Description
public static final LogSequenceNumber	INVALID_LSN Zero is used indicate an invalid pointer.
private final long	value

Access	Constructor and Description
private	LogSequenceNumber(long value)

Method Summary

Modifier and Type	Method and Description
public long	Returns: Long represent position in the write-ahead log stream asLong()
public String	Returns: String represent position in the write-ahead log stream as two hexadecimal numbers of up to 8 digits each, separated by a slash. For example `16/3002D50`, `0/15D68C50` asString()
public int	compareTo(LogSequenceNumber the object to be compared. o) Implements java.lang.Comparable.compareTo. Compares this object with the specified object for order.
public boolean	equals(@Nullable Object the reference object with which to compare. o) Overrides java.lang.Object.equals. Indicates whether some other object is "equal to" this one.
public int	hashCode() Overrides java.lang.Object.hashCode. Returns a hash code value for this object.
public String	toString() Overrides java.lang.Object.toString. Returns a string representation of the object.
public static LogSequenceNumber	Returns: not null LSN instance valueOf(long numeric represent position in the write-ahead log stream value)
public static LogSequenceNumber	Returns: not null LSN instance where if specified string represent have not valid form `LogSequenceNumber#INVALID_LSN` valueOf(String not null string as two hexadecimal numbers of up to 8 digits each, separated by a slash. For example `16/3002D50`, `0/15D68C50` strValue) Create LSN instance by string represent LSN.

Inherited from java.lang.Object:: clone finalize getClass notify notifyAll wait wait wait

INVALID_LSN	back to summary
public static final LogSequenceNumber INVALID_LSN Zero is used indicate an invalid pointer. Bootstrap skips the first possible WAL segment, initializing the first WAL page at XLOG_SEG_SIZE, so no XLOG record can begin at zero.

value	back to summary
private final long value

LogSequenceNumber	back to summary
private LogSequenceNumber(long value)

Method Detail

asLong	back to summary
public long asLong() Returns:long Long represent position in the write-ahead log stream

asString	back to summary
public String asString() Returns:String String represent position in the write-ahead log stream as two hexadecimal numbers of up to 8 digits each, separated by a slash. For example `16/3002D50`, `0/15D68C50`

compareTo back to summary

compareTo	back to summary
public int compareTo(LogSequenceNumber o) Implements java.lang.Comparable.compareTo. Doc from java.lang.Comparable.compareTo. Compares this object with the specified object for order. Returns a negative integer, zero, or a positive integer as this object is less than, equal to, or greater than the specified object. The implementor must ensure `signum(x.compareTo(y)) == -signum(y.compareTo(x))` for all `x` and `y`. (This implies that `x.compareTo(y)` must throw an exception if and only if `y.compareTo(x)` throws an exception.) The implementor must also ensure that the relation is transitive: `(x.compareTo(y) > 0 && y.compareTo(z) > 0)` implies `x.compareTo(z) > 0`. Finally, the implementor must ensure that `x.compareTo(y)==0` implies that `signum(x.compareTo(z)) == signum(y.compareTo(z))`, for all `z`. Parameters o:LogSequenceNumber the object to be compared. Returns:int a negative integer, zero, or a positive integer as this object is less than, equal to, or greater than the specified object. Annotations @Override

public int compareTo(LogSequenceNumber o)

Implements java.lang.Comparable.compareTo.

Doc from java.lang.Comparable.compareTo.

Compares this object with the specified object for order. Returns a negative integer, zero, or a positive integer as this object is less than, equal to, or greater than the specified object.

The implementor must ensure signum(x.compareTo(y)) == -signum(y.compareTo(x)) for all x and y. (This implies that x.compareTo(y) must throw an exception if and only if y.compareTo(x) throws an exception.)

The implementor must also ensure that the relation is transitive: (x.compareTo(y) > 0 && y.compareTo(z) > 0) implies x.compareTo(z) > 0.

Finally, the implementor must ensure that x.compareTo(y)==0 implies that signum(x.compareTo(z)) == signum(y.compareTo(z)), for all z.

Parameters

o:LogSequenceNumber: the object to be compared.

Returns:int

a negative integer, zero, or a positive integer as this object is less than, equal to, or greater than the specified object.

Annotations

@Override

equals back to summary

equals	back to summary
public boolean equals(@Nullable Object o) Overrides java.lang.Object.equals. Doc from java.lang.Object.equals. Indicates whether some other object is "equal to" this one. The `equals` method implements an equivalence relation on non-null object references: It is reflexive: for any non-null reference value `x`, `x.equals(x)` should return `true`. It is symmetric: for any non-null reference values `x` and `y`, `x.equals(y)` should return `true` if and only if `y.equals(x)` returns `true`. It is transitive: for any non-null reference values `x`, `y`, and `z`, if `x.equals(y)` returns `true` and `y.equals(z)` returns `true`, then `x.equals(z)` should return `true`. It is consistent: for any non-null reference values `x` and `y`, multiple invocations of `x.equals(y)` consistently return `true` or consistently return `false`, provided no information used in `equals` comparisons on the objects is modified. For any non-null reference value `x`, `x.equals(null)` should return `false`. An equivalence relation partitions the elements it operates on into equivalence classes; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes. Parameters o:@Nullable Object the reference object with which to compare. Returns:boolean `true` if this object is the same as the obj argument; `false` otherwise. Annotations @Override

public boolean equals(@Nullable Object o)

Overrides java.lang.Object.equals.

Doc from java.lang.Object.equals.

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

It is reflexive: for any non-null reference value x, x.equals(x) should return true.
It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
For any non-null reference value x, x.equals(null) should return false.

An equivalence relation partitions the elements it operates on into equivalence classes; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes.

Parameters

o:@Nullable Object: the reference object with which to compare.

Returns:boolean

true if this object is the same as the obj argument; false otherwise.

Annotations

@Override

hashCode back to summary

hashCode	back to summary
public int hashCode() Overrides java.lang.Object.hashCode. Doc from java.lang.Object.hashCode. Returns a hash code value for this object. This method is supported for the benefit of hash tables such as those provided by `java.util.HashMap`. The general contract of `hashCode` is: Whenever it is invoked on the same object more than once during an execution of a Java application, the `hashCode` method must consistently return the same integer, provided no information used in `equals` comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application. If two objects are equal according to the `equals` method, then calling the `hashCode` method on each of the two objects must produce the same integer result. It is not required that if two objects are unequal according to the `equals` method, then calling the `hashCode` method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables. Returns:int a hash code value for this object Annotations @Override

public int hashCode()

Overrides java.lang.Object.hashCode.

Doc from java.lang.Object.hashCode.

Returns a hash code value for this object. This method is supported for the benefit of hash tables such as those provided by java.util.HashMap.

The general contract of hashCode is:

Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
If two objects are equal according to the equals method, then calling the hashCode method on each of the two objects must produce the same integer result.
It is not required that if two objects are unequal according to the equals method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

Returns:int

a hash code value for this object

Annotations

@Override

toString back to summary

toString	back to summary
public String toString() Overrides java.lang.Object.toString. Doc from java.lang.Object.toString. Returns a string representation of the object. Satisfying this method's contract implies a non-`null` result must be returned. Returns:String a string representation of the object Annotations @Override

public String toString()

Overrides java.lang.Object.toString.

Doc from java.lang.Object.toString.

Returns a string representation of the object. Satisfying this method's contract implies a non-null result must be returned.

Returns:String

a string representation of the object

Annotations

@Override

valueOf	back to summary
public static LogSequenceNumber valueOf(long value) Parameters value:long numeric represent position in the write-ahead log stream Returns:LogSequenceNumber not null LSN instance

valueOf back to summary

valueOf	back to summary
public static LogSequenceNumber valueOf(String strValue) Create LSN instance by string represent LSN. Parameters strValue:String not null string as two hexadecimal numbers of up to 8 digits each, separated by a slash. For example `16/3002D50`, `0/15D68C50` Returns:LogSequenceNumber not null LSN instance where if specified string represent have not valid form `LogSequenceNumber#INVALID_LSN`

public static LogSequenceNumber valueOf(String strValue)

Create LSN instance by string represent LSN.

Parameters

strValue:String: not null string as two hexadecimal numbers of up to 8 digits each, separated by a slash. For example 16/3002D50, 0/15D68C50

Returns:LogSequenceNumber

not null LSN instance where if specified string represent have not valid form LogSequenceNumber#INVALID_LSN

public final Class LogSequenceNumber

Field Summary

Constructor Summary

Method Summary

Field Detail

Constructor Detail

Method Detail