Move atomix-storage to a top-level directory

[controller.git] / third-party / atomix / storage / src / main / java / io / atomix / storage / journal / SegmentedJournalReader.java

diff --git a/third-party/atomix/storage/src/main/java/io/atomix/storage/journal/SegmentedJournalReader.java b/third-party/atomix/storage/src/main/java/io/atomix/storage/journal/SegmentedJournalReader.java
deleted file mode 100644 (file)
index 799f395..0000000
--- a/third-party/atomix/storage/src/main/java/io/atomix/storage/journal/SegmentedJournalReader.java
+++ /dev/null
@@ -1,188 +0,0 @@
-/*
- * Copyright 2017-present Open Networking Foundation
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package io.atomix.storage.journal;
-
-import java.util.NoSuchElementException;
-
-/**
- * Raft log reader.
- */
-public class SegmentedJournalReader<E> implements JournalReader<E> {
-
-  private final SegmentedJournal<E> journal;
-  private JournalSegment<E> currentSegment;
-  private Indexed<E> previousEntry;
-  private MappableJournalSegmentReader<E> currentReader;
-  private final Mode mode;
-
-  public SegmentedJournalReader(SegmentedJournal<E> journal, long index, Mode mode) {
-    this.journal = journal;
-    this.mode = mode;
-    initialize(index);
-  }
-
-  /**
-   * Initializes the reader to the given index.
-   */
-  private void initialize(long index) {
-    currentSegment = journal.getSegment(index);
-    currentSegment.acquire();
-    currentReader = currentSegment.createReader();
-    long nextIndex = getNextIndex();
-    while (index > nextIndex && hasNext()) {
-      next();
-      nextIndex = getNextIndex();
-    }
-  }
-
-  @Override
-  public long getFirstIndex() {
-    return journal.getFirstSegment().index();
-  }
-
-  @Override
-  public long getCurrentIndex() {
-    long currentIndex = currentReader.getCurrentIndex();
-    if (currentIndex != 0) {
-      return currentIndex;
-    }
-    if (previousEntry != null) {
-      return previousEntry.index();
-    }
-    return 0;
-  }
-
-  @Override
-  public Indexed<E> getCurrentEntry() {
-    Indexed<E> currentEntry = currentReader.getCurrentEntry();
-    if (currentEntry != null) {
-      return currentEntry;
-    }
-    return previousEntry;
-  }
-
-  @Override
-  public long getNextIndex() {
-    return currentReader.getNextIndex();
-  }
-
-  @Override
-  public void reset() {
-    currentReader.close();
-    currentSegment.release();
-    currentSegment = journal.getFirstSegment();
-    currentSegment.acquire();
-    currentReader = currentSegment.createReader();
-    previousEntry = null;
-  }
-
-  @Override
-  public void reset(long index) {
-    // If the current segment is not open, it has been replaced. Reset the segments.
-    if (!currentSegment.isOpen()) {
-      reset();
-    }
-
-    if (index < currentReader.getNextIndex()) {
-      rewind(index);
-    } else if (index > currentReader.getNextIndex()) {
-      forward(index);
-    } else {
-      currentReader.reset(index);
-    }
-  }
-
-  /**
-   * Rewinds the journal to the given index.
-   */
-  private void rewind(long index) {
-    if (currentSegment.index() >= index) {
-      JournalSegment<E> segment = journal.getSegment(index - 1);
-      if (segment != null) {
-        currentReader.close();
-        currentSegment.release();
-        currentSegment = segment;
-        currentSegment.acquire();
-        currentReader = currentSegment.createReader();
-      }
-    }
-
-    currentReader.reset(index);
-    previousEntry = currentReader.getCurrentEntry();
-  }
-
-  /**
-   * Fast forwards the journal to the given index.
-   */
-  private void forward(long index) {
-    while (getNextIndex() < index && hasNext()) {
-      next();
-    }
-  }
-
-  @Override
-  public boolean hasNext() {
-    if (mode == Mode.ALL) {
-      return hasNextEntry();
-    }
-
-    long nextIndex = getNextIndex();
-    long commitIndex = journal.getCommitIndex();
-    return nextIndex <= commitIndex && hasNextEntry();
-  }
-
-  private boolean hasNextEntry() {
-    if (!currentReader.hasNext()) {
-      JournalSegment<E> nextSegment = journal.getNextSegment(currentSegment.index());
-      if (nextSegment != null && nextSegment.index() == getNextIndex()) {
-        previousEntry = currentReader.getCurrentEntry();
-        currentSegment.release();
-        currentSegment = nextSegment;
-        currentSegment.acquire();
-        currentReader = currentSegment.createReader();
-        return currentReader.hasNext();
-      }
-      return false;
-    }
-    return true;
-  }
-
-  @Override
-  public Indexed<E> next() {
-    if (!currentReader.hasNext()) {
-      JournalSegment<E> nextSegment = journal.getNextSegment(currentSegment.index());
-      if (nextSegment != null && nextSegment.index() == getNextIndex()) {
-        previousEntry = currentReader.getCurrentEntry();
-        currentSegment.release();
-        currentSegment = nextSegment;
-        currentSegment.acquire();
-        currentReader = currentSegment.createReader();
-        return currentReader.next();
-      } else {
-        throw new NoSuchElementException();
-      }
-    } else {
-      previousEntry = currentReader.getCurrentEntry();
-      return currentReader.next();
-    }
-  }
-
-  @Override
-  public void close() {
-    currentReader.close();
-    journal.closeReader(this);
-  }
-}