ReconcilingBinlogReader (Debezium Connector for MySQL 1.4.0.Beta1 API)

java.lang.Object
- io.debezium.connector.mysql.ReconcilingBinlogReader

All Implemented Interfaces:

Reader
```
public class ReconcilingBinlogReader
extends Object
implements Reader
```
A reader that unifies the binlog positions of two binlog readers. To do this, at start time we evaluate the (now completed) states of the two binlog readers we want to unify, and create a new BinlogReader duplicating the lagging reader, but with a halting predicate that will halt it once it has passed the final position of the leading reader.

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`(package private) static class`	`ReconcilingBinlogReader.OffsetLimitPredicate` A Predicate that returns false for any record beyond a given offset.

Nested classes/interfaces inherited from interface io.debezium.connector.mysql.Reader
Reader.State

Field Summary

Fields
Modifier and Type	Field and Description
`private Boolean`	`aReaderLeading`
`private BinlogReader`	`binlogReaderA`
`private BinlogReader`	`binlogReaderB`
`private AtomicBoolean`	`completed`
`private static org.slf4j.Logger`	`LOGGER`
`private BinlogReader`	`reconcilingReader`
`private AtomicBoolean`	`running`
`private long`	`serverId`
`private BinlogReader`	`unifiedReader`
`private AtomicReference<Runnable>`	`uponCompletion`

Constructor Summary

Constructors
Constructor and Description
`ReconcilingBinlogReader(BinlogReader binlogReaderA, BinlogReader binlogReaderB, BinlogReader unifiedReader, long serverId)` Create a reconciling Binlog Reader.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`private void`	`checkLaggingLeadingInfo()`
`private void`	`completeSuccessfully()`
`private void`	`determineLeadingReader()`
`(package private) BinlogReader`	`getLaggingReader()`
`(package private) BinlogReader`	`getLeadingReader()`
`String`	`name()` Get the name of this reader.
`List<org.apache.kafka.connect.source.SourceRecord>`	`poll()` Poll for the next batch of source records.
`private void`	`setupUnifiedReader()`
`void`	`start()` Start the reader and return immediately.
`Reader.State`	`state()` Get the current state of this reader.
`void`	`stop()` Stop the reader from running and transition to the `Reader.State.STOPPING` state until all remaining records are `consumed`, at which point its state transitions to `Reader.State.STOPPED`.
`void`	`uponCompletion(Runnable handler)` Set the function that should be called when this reader transitions from the `Reader.State.STOPPING` to `Reader.State.STOPPED` state, which is after all generated records have been consumed via the `poll` method.

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

Methods inherited from interface io.debezium.connector.mysql.Reader
destroy, initialize

- Field Detail
  - LOGGER
```
private static final org.slf4j.Logger LOGGER
```
  - binlogReaderA
```
private final BinlogReader binlogReaderA
```
  - binlogReaderB
```
private final BinlogReader binlogReaderB
```
  - unifiedReader
```
private final BinlogReader unifiedReader
```
  - reconcilingReader
```
private BinlogReader reconcilingReader
```
  - aReaderLeading
```
private Boolean aReaderLeading
```
  - running
```
private final AtomicBoolean running
```
  - completed
```
private final AtomicBoolean completed
```
  - uponCompletion
```
private final AtomicReference<Runnable> uponCompletion
```
  - serverId
```
private final long serverId
```
- Constructor Detail
  - ReconcilingBinlogReader
```
public ReconcilingBinlogReader(BinlogReader binlogReaderA,
                               BinlogReader binlogReaderB,
                               BinlogReader unifiedReader,
                               long serverId)
```
    Create a reconciling Binlog Reader.
    
    Parameters:
    
    binlogReaderA - the first binlog reader to unify.
    
    binlogReaderB - the second binlog reader to unify.
    
    unifiedReader - the final, unified binlog reader that will run once the reconciliation is complete.
- Method Detail
  - name
```
public String name()
```
    Description copied from interface: Reader
    
    Get the name of this reader.
    
    Specified by:
    
    name in interface Reader
    
    Returns:
    
    the reader's name; never null
  - state
```
public Reader.State state()
```
    Description copied from interface: Reader
    
    Get the current state of this reader.
    
    Specified by:
    
    state in interface Reader
    
    Returns:
    
    the state; never null
  - uponCompletion
```
public void uponCompletion(Runnable handler)
```
    Description copied from interface: Reader
    
    Set the function that should be called when this reader transitions from the Reader.State.STOPPING to Reader.State.STOPPED state, which is after all generated records have been consumed via the poll method.
    This method should only be called while the reader is in the Reader.State.STOPPED state.
    
    Specified by:
    
    uponCompletion in interface Reader
    
    Parameters:
    
    handler - the function; may not be null
  - start
```
public void start()
```
    Description copied from interface: Reader
    
    Start the reader and return immediately. Once started, the SourceRecords generated by the reader can be obtained by periodically calling Reader.poll() until that method returns null.
    This method does nothing if it is already running.
    
    Specified by:
    
    start in interface Reader
  - stop
```
public void stop()
```
    Description copied from interface: Reader
    
    Stop the reader from running and transition to the Reader.State.STOPPING state until all remaining records are consumed, at which point its state transitions to Reader.State.STOPPED.
    
    Specified by:
    
    stop in interface Reader
  - poll
```
public List<org.apache.kafka.connect.source.SourceRecord> poll()
                                                        throws InterruptedException
```
    Description copied from interface: Reader
    
    Poll for the next batch of source records. This method returns null only when all records generated by this reader have been processed, following the natural or explicit stopping of this reader. Note that this method may block if no additional records are available but the reader may produce more, thus callers should call this method continually until this method returns null.
    
    Specified by:
    
    poll in interface Reader
    
    Returns:
    
    the list of source records that may or may not be empty; or null when there will be no more records because the reader has completely Reader.State.STOPPED.
    
    Throws:
    
    InterruptedException - if this thread is interrupted while waiting for more records
  - completeSuccessfully
```
private void completeSuccessfully()
```
  - setupUnifiedReader
```
private void setupUnifiedReader()
```
  - determineLeadingReader
```
private void determineLeadingReader()
```
  - getLeadingReader
```
BinlogReader getLeadingReader()
```
  - getLaggingReader
```
BinlogReader getLaggingReader()
```
  - checkLaggingLeadingInfo
```
private void checkLaggingLeadingInfo()
```

Class ReconcilingBinlogReader

Nested Class Summary

Nested classes/interfaces inherited from interface io.debezium.connector.mysql.Reader

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface io.debezium.connector.mysql.Reader

Field Detail

LOGGER

binlogReaderA

binlogReaderB

unifiedReader

reconcilingReader

aReaderLeading

running

completed

uponCompletion

serverId

Constructor Detail

ReconcilingBinlogReader

Method Detail

name

state

uponCompletion

start

stop

poll

completeSuccessfully

setupUnifiedReader

determineLeadingReader

getLeadingReader

getLaggingReader

checkLaggingLeadingInfo