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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing
/*
* Licensed to the Apache Software Foundation (ASF) under one or more contributor license
* agreements. See the NOTICE file distributed with this work for additional information regarding
* copyright ownership. The ASF licenses this file to You 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 org.apache.geode.internal.cache.snapshot;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.List;
import java.util.Map.Entry;
import java.util.UUID;
import org.apache.geode.cache.EntryDestroyedException;
import org.apache.geode.distributed.DistributedMember;
import org.apache.geode.internal.DataSerializableFixedID;
import org.apache.geode.internal.InternalDataSerializer;
import org.apache.geode.internal.Version;
import org.apache.geode.internal.cache.CachedDeserializable;
import org.apache.geode.internal.cache.LocalRegion;
import org.apache.geode.internal.cache.LocalRegion.NonTXEntry;
import org.apache.geode.internal.cache.Token;
import org.apache.geode.internal.offheap.OffHeapHelper;
import org.apache.geode.internal.offheap.StoredObject;
import org.apache.geode.internal.offheap.annotations.Released;
import org.apache.geode.internal.offheap.annotations.Retained;
import org.apache.geode.internal.util.BlobHelper;
/**
* Provides an envelope for transmitting a collection of SnapshotRecords during export.
*
*/
public class SnapshotPacket implements DataSerializableFixedID {
/**
* Captures the key/value data from a cache entry for import or export.
*/
public static class SnapshotRecord implements DataSerializableFixedID {
/** the serialized key */
private byte[] key;
/** the serialized value */
private byte[] value;
/** for deserialization */
public SnapshotRecord() {}
public SnapshotRecord(byte[] key, byte[] value) {
this.key = key;
this.value = value;
}
public SnapshotRecord(K keyObj, V valObj) throws IOException {
key = BlobHelper.serializeToBlob(keyObj);
value = convertToBytes(valObj);
}
public SnapshotRecord(LocalRegion region, Entry entry) throws IOException {
key = BlobHelper.serializeToBlob(entry.getKey());
if (entry instanceof NonTXEntry && region != null) {
@Released
Object v =
((NonTXEntry) entry).getRegionEntry().getValueOffHeapOrDiskWithoutFaultIn(region);
try {
value = convertToBytes(v);
} finally {
OffHeapHelper.release(v);
}
} else {
value = convertToBytes(entry.getValue());
}
}
/**
* Returns the serialized key.
*
* @return the key
*/
public byte[] getKey() {
return key;
}
/**
* Returns the serialized value.
*
* @return the value
*/
public byte[] getValue() {
return value;
}
/**
* Returns the deserialized key object.
*
* @return the key
*
* @throws IOException error deserializing key
* @throws ClassNotFoundException unable to deserialize key
*/
public K getKeyObject() throws IOException, ClassNotFoundException {
return (K) BlobHelper.deserializeBlob(key);
}
/**
* Returns the deserialized value object.
*
* @return the value
*
* @throws IOException error deserializing value
* @throws ClassNotFoundException unable to deserialize value
*/
public V getValueObject() throws IOException, ClassNotFoundException {
return value == null ? null : (V) BlobHelper.deserializeBlob(value);
}
/**
* Returns true if the record has a value.
*
* @return the value, or null
*/
public boolean hasValue() {
return value != null;
}
/**
* Returns the size in bytes of the serialized key and value.
*
* @return the record size
*/
public int getSize() {
return key.length + (value == null ? 0 : value.length);
}
@Override
public void toData(DataOutput out) throws IOException {
InternalDataSerializer.writeByteArray(key, out);
InternalDataSerializer.writeByteArray(value, out);
}
@Override
public int getDSFID() {
return SNAPSHOT_RECORD;
}
@Override
public void fromData(DataInput in) throws IOException, ClassNotFoundException {
key = InternalDataSerializer.readByteArray(in);
value = InternalDataSerializer.readByteArray(in);
}
private byte[] convertToBytes(Object val) throws IOException {
if (Token.isRemoved(val)) {
throw new EntryDestroyedException();
} else if (Token.isInvalid(val)) {
return null;
} else if (val instanceof CachedDeserializable) {
byte[] bytes = ((CachedDeserializable) val).getSerializedValue();
return bytes;
} else if (val != null) {
return BlobHelper.serializeToBlob(val);
}
return null;
}
@Override
public Version[] getSerializationVersions() {
return null;
}
}
/** the window id for responses */
private int windowId;
/** the packet id */
private String packetId;
/** the member sending the packet */
private DistributedMember sender;
/** the snapshot data */
private SnapshotRecord[] records;
/** for deserialization */
public SnapshotPacket() {}
public SnapshotPacket(int windowId, DistributedMember sender, List recs) {
this.windowId = windowId;
this.packetId = UUID.randomUUID().toString();
this.sender = sender;
records = recs.toArray(new SnapshotRecord[recs.size()]);
}
/**
* Returns the window id for sending responses.
*
* @return the window id
*/
public int getWindowId() {
return windowId;
}
/**
* Returns the packet id.
*
* @return the packet id
*/
public String getPacketId() {
return packetId;
}
/**
* Returns the member that sent the packet.
*
* @return the sender
*/
public DistributedMember getSender() {
return sender;
}
/**
* Returns the snapshot data
*
* @return the records
*/
public SnapshotRecord[] getRecords() {
return records;
}
@Override
public int getDSFID() {
return SNAPSHOT_PACKET;
}
@Override
public void toData(DataOutput out) throws IOException {
out.writeInt(windowId);
InternalDataSerializer.writeString(packetId, out);
InternalDataSerializer.writeObject(sender, out);
InternalDataSerializer.writeArrayLength(records.length, out);
for (SnapshotRecord rec : records) {
InternalDataSerializer.invokeToData(rec, out);
}
}
@Override
public void fromData(DataInput in) throws IOException, ClassNotFoundException {
windowId = in.readInt();
packetId = InternalDataSerializer.readString(in);
sender = InternalDataSerializer.readObject(in);
int count = InternalDataSerializer.readArrayLength(in);
records = new SnapshotRecord[count];
for (int i = 0; i < count; i++) {
SnapshotRecord rec = new SnapshotRecord();
InternalDataSerializer.invokeFromData(rec, in);
records[i] = rec;
}
}
@Override
public Version[] getSerializationVersions() {
return null;
}
}