Package org.postgresql.replication
Class LogSequenceNumber
- java.lang.Object
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- org.postgresql.replication.LogSequenceNumber
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- All Implemented Interfaces:
java.lang.Comparable<LogSequenceNumber>
public final class LogSequenceNumber extends java.lang.Object implements java.lang.Comparable<LogSequenceNumber>
LSN (Log Sequence Number) data which is a pointer to a location in the XLOG.
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Field Summary
Fields Modifier and Type Field Description static LogSequenceNumber
INVALID_LSN
Zero is used indicate an invalid pointer.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description long
asLong()
java.lang.String
asString()
int
compareTo(LogSequenceNumber o)
boolean
equals(java.lang.Object o)
int
hashCode()
java.lang.String
toString()
static LogSequenceNumber
valueOf(long value)
static LogSequenceNumber
valueOf(java.lang.String strValue)
Create LSN instance by string represent LSN.
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Field Detail
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INVALID_LSN
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.
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Method Detail
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valueOf
public static LogSequenceNumber valueOf(long value)
- Parameters:
value
- numeric represent position in the write-ahead log stream- Returns:
- not null LSN instance
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valueOf
public static LogSequenceNumber valueOf(java.lang.String strValue)
Create LSN instance by string represent LSN.- Parameters:
strValue
- not null string as two hexadecimal numbers of up to 8 digits each, separated by a slash. For example16/3002D50
,0/15D68C50
- Returns:
- not null LSN instance where if specified string represent have not valid form
INVALID_LSN
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asLong
public long asLong()
- Returns:
- Long represent position in the write-ahead log stream
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asString
public java.lang.String asString()
- 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
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equals
public boolean equals(java.lang.Object o)
- Overrides:
equals
in classjava.lang.Object
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hashCode
public int hashCode()
- Overrides:
hashCode
in classjava.lang.Object
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toString
public java.lang.String toString()
- Overrides:
toString
in classjava.lang.Object
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compareTo
public int compareTo(LogSequenceNumber o)
- Specified by:
compareTo
in interfacejava.lang.Comparable<LogSequenceNumber>
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