feat(iterator):Auto commit mode for applying log iterator

jraft-core/src/main/java/com/alipay/sofa/jraft/Iterator.java

@@ -28,6 +28,12 @@
  */
 public interface Iterator extends java.util.Iterator<ByteBuffer> {
 
+ /**
+ * When calling #{Iterator#next}, whether to commit the state machine. Don't by default.
+ * @param status enables auto-commit mode or not, true means enable.
+ */
+ void setAutoCommitPerLog(boolean status);
+
  /**
  * Return the data whose content is the same as what was passed to
  * Node#apply(Task) in the leader node.

jraft-core/src/main/java/com/alipay/sofa/jraft/core/IteratorImpl.java

@@ -46,10 +46,11 @@ public class IteratorImpl {
  private final long firstClosureIndex;
  private long currentIndex;
  private final long committedIndex;
- private long fsmCommittedIndex; // fsm commit index
- private LogEntry currEntry = new LogEntry(); // blank entry
+ private long fsmCommittedIndex;  // fsm commit index
+ private LogEntry currEntry  = new LogEntry(); // blank entry
  private final AtomicLong applyingIndex;
  private RaftException error;
+ private boolean autoCommitPerLog = false; // Default enabled
 
  public IteratorImpl(final FSMCallerImpl fsmCaller, final LogManager logManager, final List<Closure> closures,
  final long firstClosureIndex, final long lastAppliedIndex, final long committedIndex,
@@ -90,6 +91,14 @@ public boolean hasError() {
  return this.error != null;
  }
 
+ public void setAutoCommitPerLog(boolean status) {
+ this.autoCommitPerLog = status;
+ }
+
+ public boolean getAutoCommitPerLog() {
+ return this.autoCommitPerLog;
+ }
+
  /**
  * Move to next
  */

jraft-core/src/main/java/com/alipay/sofa/jraft/core/IteratorWrapper.java

@@ -40,13 +40,22 @@ public boolean hasNext() {
 
  @Override
  public ByteBuffer next() {
+ // commit log if auto-commit mode is enabled and no errors occur before accessing the next log
+ if (impl.getAutoCommitPerLog() && !impl.hasError()) {
+ commit();
+ }
  final ByteBuffer data = getData();
  if (hasNext()) {
  this.impl.next();
  }
  return data;
  }
 
+ @Override
+ public void setAutoCommitPerLog(boolean status) {
+ impl.setAutoCommitPerLog(status);
+ }
+
  @Override
  public ByteBuffer getData() {
  final LogEntry entry = this.impl.entry();

jraft-core/src/test/java/com/alipay/sofa/jraft/core/IteratorTest.java

@@ -183,4 +183,31 @@ public void testSetErrorAndRollback() {
  iterImpl.getError().getStatus().getErrorMsg());
  assertEquals(6, iter.getIndex());
  }
+
+ @Test
+ public void testAutoCommitPerLog() {
+ iter.setAutoCommitPerLog(true);
+ int i = 1;
+ while (iter.hasNext()) {
+ assertEquals(i, iter.getIndex());
+ assertNotNull(iter.done());
+ assertEquals(i, iter.getIndex());
+ assertEquals(1, iter.getTerm());
+ assertEquals(i, iter.getData().remaining());
+ iter.next();
+ i++;
+ }
+ assertFalse(iter.commit());
+ assertEquals(i, 11);
+ assertFalse(iterImpl.hasError());
+ this.iter.setErrorAndRollback(10, new Status(-1, "test"));
+ assertTrue(iterImpl.hasError());
+ Assert.assertEquals(EnumOutter.ErrorType.ERROR_TYPE_STATE_MACHINE, iterImpl.getError().getType());
+ Assert.assertEquals(RaftError.ESTATEMACHINE.getNumber(), iterImpl.getError().getStatus().getCode());
+ Assert
+ .assertEquals(
+ "StateMachine meet critical error when applying one or more tasks since index=11, Status[UNKNOWN<-1>: test]",
+ iterImpl.getError().getStatus().getErrorMsg());
+ assertEquals(11, iter.getIndex());
+ }
 }