Rehost Chunked{ByteArray,InputStream,OutputStream}

[controller.git] / opendaylight / md-sal / sal-clustering-commons / src / main / java / org / opendaylight / controller / cluster / io / ChunkedByteArray.java

diff --git a/opendaylight/md-sal/sal-clustering-commons/src/main/java/org/opendaylight/controller/cluster/io/ChunkedByteArray.java b/opendaylight/md-sal/sal-clustering-commons/src/main/java/org/opendaylight/controller/cluster/io/ChunkedByteArray.java
new file mode 100644 (file)
index 0000000..87f8a18
--- /dev/null
+++ b/opendaylight/md-sal/sal-clustering-commons/src/main/java/org/opendaylight/controller/cluster/io/ChunkedByteArray.java
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2019 PANTHEON.tech, s.r.o. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.cluster.io;
+
+import static java.util.Objects.requireNonNull;
+
+import com.google.common.annotations.Beta;
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.MoreObjects;
+import com.google.common.collect.ImmutableList;
+import com.google.common.io.ByteSink;
+import java.io.DataOutput;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.ObjectInput;
+import java.util.ArrayList;
+import java.util.List;
+import org.eclipse.jdt.annotation.NonNullByDefault;
+import org.opendaylight.yangtools.concepts.Immutable;
+
+@Beta
+@NonNullByDefault
+public final class ChunkedByteArray implements Immutable {
+    private final ImmutableList<byte[]> chunks;
+    private final int size;
+
+    ChunkedByteArray(final int size, final ImmutableList<byte[]> chunks) {
+        this.size = size;
+        this.chunks = requireNonNull(chunks);
+    }
+
+    public static ChunkedByteArray readFrom(final ObjectInput in, final int size, final int chunkSize)
+            throws IOException {
+        final List<byte[]> chunks = new ArrayList<>(requiredChunks(size, chunkSize));
+        int remaining = size;
+        do {
+            final byte[] buffer = new byte[Math.min(remaining, chunkSize)];
+            in.readFully(buffer);
+            chunks.add(buffer);
+            remaining -= buffer.length;
+        } while (remaining != 0);
+
+        return new ChunkedByteArray(size, ImmutableList.copyOf(chunks));
+    }
+
+    public int size() {
+        return size;
+    }
+
+    public InputStream openStream() {
+        return new ChunkedInputStream(size, chunks.iterator());
+    }
+
+    public void copyTo(final DataOutput output) throws IOException {
+        for (byte[] chunk : chunks) {
+            output.write(chunk, 0, chunk.length);
+        }
+    }
+
+    public void copyTo(final ByteSink output) throws IOException {
+        for (byte[] chunk : chunks) {
+            output.write(chunk);
+        }
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(this).add("size", size).add("chunkCount", chunks.size()).toString();
+    }
+
+    @VisibleForTesting
+    ImmutableList<byte[]> getChunks() {
+        return chunks;
+    }
+
+    private static int requiredChunks(final int size, final int chunkSize) {
+        final int div = size / chunkSize;
+        return size % chunkSize == 0 ? div : div + 1;
+    }
+}