Merge "Startup arch - feature cleanup"

[controller.git] / opendaylight / md-sal / sal-akka-raft / src / main / java / org / opendaylight / controller / cluster / raft / AbstractReplicatedLogImpl.java

diff --git a/opendaylight/md-sal/sal-akka-raft/src/main/java/org/opendaylight/controller/cluster/raft/AbstractReplicatedLogImpl.java b/opendaylight/md-sal/sal-akka-raft/src/main/java/org/opendaylight/controller/cluster/raft/AbstractReplicatedLogImpl.java
index b5b034afb9cf8edc7635cfca5509c93cbeb457b5..1aecc89eeafa2b746f4e751f9869ed68d1229bee 100644 (file)
--- a/opendaylight/md-sal/sal-akka-raft/src/main/java/org/opendaylight/controller/cluster/raft/AbstractReplicatedLogImpl.java
+++ b/opendaylight/md-sal/sal-akka-raft/src/main/java/org/opendaylight/controller/cluster/raft/AbstractReplicatedLogImpl.java
@@ -7,7 +7,9 @@
  */
 package org.opendaylight.controller.cluster.raft;
 
+import com.google.common.base.Preconditions;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 
 /**
@@ -16,27 +18,31 @@ import java.util.List;
  */
 public abstract class AbstractReplicatedLogImpl implements ReplicatedLog {
 
-    protected final List<ReplicatedLogEntry> journal;
-    protected final Object snapshot;
-    protected long snapshotIndex = -1;
-    protected long snapshotTerm = -1;
+    // We define this as ArrayList so we can use ensureCapacity.
+    protected ArrayList<ReplicatedLogEntry> journal;
 
-    public AbstractReplicatedLogImpl(Object state, long snapshotIndex,
+    private long snapshotIndex = -1;
+    private long snapshotTerm = -1;
+
+    // to be used for rollback during save snapshot failure
+    private ArrayList<ReplicatedLogEntry> snapshottedJournal;
+    private long previousSnapshotIndex = -1;
+    private long previousSnapshotTerm = -1;
+    protected int dataSize = 0;
+
+    public AbstractReplicatedLogImpl(long snapshotIndex,
         long snapshotTerm, List<ReplicatedLogEntry> unAppliedEntries) {
-        this.snapshot = state;
         this.snapshotIndex = snapshotIndex;
         this.snapshotTerm = snapshotTerm;
         this.journal = new ArrayList<>(unAppliedEntries);
     }
 
-
     public AbstractReplicatedLogImpl() {
-        this.snapshot = null;
-        this.journal = new ArrayList<>();
+        this(-1L, -1L, Collections.<ReplicatedLogEntry>emptyList());
     }
 
     protected int adjustedIndex(long logEntryIndex) {
-        if(snapshotIndex < 0){
+        if (snapshotIndex < 0) {
             return (int) logEntryIndex;
         }
         return (int) (logEntryIndex - (snapshotIndex + 1));
@@ -98,6 +104,11 @@ public abstract class AbstractReplicatedLogImpl implements ReplicatedLog {
         journal.add(replicatedLogEntry);
     }
 
+    @Override
+    public void increaseJournalLogCapacity(int amount) {
+        journal.ensureCapacity(journal.size() + amount);
+    }
+
     @Override
     public List<ReplicatedLogEntry> getFrom(long logEntryIndex) {
         return getFrom(logEntryIndex, journal.size());
@@ -107,24 +118,28 @@ public abstract class AbstractReplicatedLogImpl implements ReplicatedLog {
     public List<ReplicatedLogEntry> getFrom(long logEntryIndex, int max) {
         int adjustedIndex = adjustedIndex(logEntryIndex);
         int size = journal.size();
-        List<ReplicatedLogEntry> entries = new ArrayList<>(100);
         if (adjustedIndex >= 0 && adjustedIndex < size) {
             // physical index should be less than list size and >= 0
             int maxIndex = adjustedIndex + max;
             if(maxIndex > size){
                 maxIndex = size;
             }
-            entries.addAll(journal.subList(adjustedIndex, maxIndex));
+            return new ArrayList<>(journal.subList(adjustedIndex, maxIndex));
+        } else {
+            return Collections.emptyList();
         }
-        return entries;
     }
 
-
     @Override
     public long size() {
        return journal.size();
     }
 
+    @Override
+    public int dataSize() {
+        return dataSize;
+    }
+
     @Override
     public boolean isPresent(long logEntryIndex) {
         if (logEntryIndex > lastIndex()) {
@@ -137,12 +152,7 @@ public abstract class AbstractReplicatedLogImpl implements ReplicatedLog {
 
     @Override
     public boolean isInSnapshot(long logEntryIndex) {
-        return logEntryIndex <= snapshotIndex;
-    }
-
-    @Override
-    public Object getSnapshot() {
-        return snapshot;
+        return logEntryIndex <= snapshotIndex && snapshotIndex != -1;
     }
 
     @Override
@@ -160,4 +170,64 @@ public abstract class AbstractReplicatedLogImpl implements ReplicatedLog {
 
     @Override
     public abstract void removeFromAndPersist(long index);
+
+    @Override
+    public void setSnapshotIndex(long snapshotIndex) {
+        this.snapshotIndex = snapshotIndex;
+    }
+
+    @Override
+    public void setSnapshotTerm(long snapshotTerm) {
+        this.snapshotTerm = snapshotTerm;
+    }
+
+    @Override
+    public void clear(int startIndex, int endIndex) {
+        journal.subList(startIndex, endIndex).clear();
+    }
+
+    @Override
+    public void snapshotPreCommit(long snapshotCapturedIndex, long snapshotCapturedTerm) {
+        Preconditions.checkArgument(snapshotCapturedIndex >= snapshotIndex,
+                "snapshotCapturedIndex must be greater than or equal to snapshotIndex");
+
+        snapshottedJournal = new ArrayList<>(journal.size());
+
+        List<ReplicatedLogEntry> snapshotJournalEntries = journal.subList(0, (int) (snapshotCapturedIndex - snapshotIndex));
+
+        snapshottedJournal.addAll(snapshotJournalEntries);
+        clear(0, (int) (snapshotCapturedIndex - snapshotIndex));
+
+        previousSnapshotIndex = snapshotIndex;
+        setSnapshotIndex(snapshotCapturedIndex);
+
+        previousSnapshotTerm = snapshotTerm;
+        setSnapshotTerm(snapshotCapturedTerm);
+    }
+
+    @Override
+    public void snapshotCommit() {
+        snapshottedJournal = null;
+        previousSnapshotIndex = -1;
+        previousSnapshotTerm = -1;
+        dataSize = 0;
+        // need to recalc the datasize based on the entries left after precommit.
+        for(ReplicatedLogEntry logEntry : journal) {
+            dataSize += logEntry.size();
+        }
+
+    }
+
+    @Override
+    public void snapshotRollback() {
+        snapshottedJournal.addAll(journal);
+        journal = snapshottedJournal;
+        snapshottedJournal = null;
+
+        snapshotIndex = previousSnapshotIndex;
+        previousSnapshotIndex = -1;
+
+        snapshotTerm = previousSnapshotTerm;
+        previousSnapshotTerm = -1;
+    }
 }