org.rx.io.KeyValueStore Maven / Gradle / Ivy
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package org.rx.io;
import com.alibaba.fastjson.JSONObject;
import com.google.common.collect.AbstractSequentialIterator;
import lombok.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.collections4.IteratorUtils;
import org.rx.bean.$;
import org.rx.bean.AbstractMap;
import org.rx.core.Disposable;
import org.rx.core.Reflects;
import org.rx.core.Strings;
import org.rx.exception.ExceptionLevel;
import org.rx.exception.InvalidException;
import org.rx.net.http.HttpServer;
import org.rx.net.http.ServerRequest;
import java.io.*;
import java.util.*;
import java.util.concurrent.atomic.AtomicInteger;
import static org.rx.bean.$.$;
import static org.rx.core.App.*;
import static org.rx.core.Extends.*;
/**
* meta
* logPosition + size
*
* index
* crc64(8) + pos(8)
*
*
log
* key + value + size(4)
*
*
减少文件，二分查找
*/
@Slf4j
public class KeyValueStore extends Disposable implements AbstractMap, Iterable> {
@AllArgsConstructor
@EqualsAndHashCode
@ToString
@Getter
static class Entry implements Map.Entry, Compressible {
private static final long serialVersionUID = -2218602651671401557L;
private void writeObject(ObjectOutputStream out) throws IOException {
out.writeObject(key);
out.writeObject(value);
}
private void readObject(ObjectInputStream in) throws IOException {
try {
key = (TK) in.readObject();
value = (TV) in.readObject();
} catch (ClassNotFoundException e) {
log.error("readObject {}", e.getMessage());
}
}
TK key;
TV value;
@Override
public TV setValue(TV value) {
throw new UnsupportedOperationException();
}
@Override
public boolean enableCompress() {
Compressible k = as(key, Compressible.class);
Compressible v = as(value, Compressible.class);
return (k != null && k.enableCompress()) || (v != null && v.enableCompress());
}
}
@RequiredArgsConstructor
enum EntryStatus {
NORMAL((byte) 0),
DELETE((byte) 1);
final byte value;
}
@RequiredArgsConstructor
class IteratorContext {
long logPos = wal.meta.getLogPosition();
final Set filter;
final Entry[] buf;
int writePos;
int readPos;
int remaining;
}
static final int TOMB_MARK = -1;
static final int DEFAULT_ITERATOR_SIZE = 50;
static final String KEY_TYPE_FIELD = "_KEY_TYPE", VALUE_TYPE_FIELD = "_VAL_TYPE";
@Getter(lazy = true)
private static final KeyValueStore instance = new KeyValueStore<>();
final KeyValueStoreConfig config;
final File parentDirectory;
final String filename;
final WALFileStream wal;
final HashKeyIndexer indexer;
final Serializer serializer;
final WriteBehindQueue queue;
final HttpServer apiServer;
File getIndexDirectory() {
File dir = new File(parentDirectory, Files.changeExtension(filename, "idx"));
dir.mkdirs();
return dir;
}
private KeyValueStore() {
this(KeyValueStoreConfig.defaultConfig(), Serializer.DEFAULT);
}
public KeyValueStore(KeyValueStoreConfig config) {
this(config, Serializer.DEFAULT);
}
public KeyValueStore(@NonNull KeyValueStoreConfig config, @NonNull Serializer serializer) {
this.config = config;
filename = Files.getName(config.getFilePath());
if (Strings.isEmpty(filename)) {
throw new InvalidException("Empty file name");
}
parentDirectory = new File(Files.createDirectory(config.getFilePath()));
this.serializer = serializer;
File logFile = new File(Files.changeExtension(config.getFilePath(), "log"));
wal = new WALFileStream(logFile, config.getLogGrowSize(), config.getLogReaderCount(), serializer);
indexer = new HashKeyIndexer<>(getIndexDirectory(), config.getIndexSlotSize(), config.getIndexGrowSize());
wal.lock.writeInvoke(() -> {
long pos = wal.meta.getLogPosition();
log.debug("init logPos={}", pos);
// pos = WALFileStream.HEADER_SIZE;
Entry val;
$ endPos = $();
while ((val = findValue(pos, null, endPos)) != null) {
boolean incr = false;
TK k = val.key;
HashKeyIndexer.KeyData key = indexer.findKey(k);
if (key == null) {
key = new HashKeyIndexer.KeyData<>(k);
incr = true;
}
if (key.logPosition == TOMB_MARK) {
incr = true;
}
key.logPosition = val.value == null ? TOMB_MARK : pos;
wal.meta.setLogPosition(endPos.v);
indexer.saveKey(key);
if (incr) {
wal.meta.incrementSize();
}
log.debug("recover {}", key);
pos = endPos.v;
}
});
if (wal.meta.extra == null) {
wal.meta.extra = new AtomicInteger();
}
queue = new WriteBehindQueue<>(config.getWriteBehindDelayed(), config.getWriteBehindHighWaterMark());
if (config.getApiPort() > 0) {
apiServer = new HttpServer(config.getApiPort(), config.isApiSsl())
.requestMapping("/get", ((request, response) -> {
apiCheck(request);
JSONObject reqJson = toJsonObject(request.jsonBody());
JSONObject resJson = new JSONObject();
Object key = reqJson.get("key");
if (key == null) {
resJson.put("code", 1);
response.jsonBody(resJson);
return;
}
TK k = apiDeserialize(reqJson, KEY_TYPE_FIELD, key);
apiSerialize(resJson, VALUE_TYPE_FIELD, get(k));
response.jsonBody(resJson);
})).requestMapping("/set", (request, response) -> {
apiCheck(request);
JSONObject reqJson = toJsonObject(request.jsonBody());
JSONObject resJson = new JSONObject();
Object key = reqJson.get("key");
if (key == null) {
resJson.put("code", 1);
response.jsonBody(resJson);
return;
}
TK k = apiDeserialize(reqJson, KEY_TYPE_FIELD, key);
Object value = reqJson.get("value"), concurrentValue = reqJson.get("concurrentValue");
if (value == null) {
if (concurrentValue == null) {
apiSerialize(resJson, VALUE_TYPE_FIELD, remove(k));
} else {
apiSerialize(resJson, VALUE_TYPE_FIELD, remove(k, apiDeserialize(reqJson, VALUE_TYPE_FIELD, concurrentValue)));
}
response.jsonBody(resJson);
return;
}
TV v = apiDeserialize(reqJson, VALUE_TYPE_FIELD, value);
if (concurrentValue == null) {
byte flag = ifNull(reqJson.getByte("flag"), (byte) 0);
switch (flag) {
case 1:
apiSerialize(resJson, VALUE_TYPE_FIELD, putIfAbsent(k, v));
break;
case 2:
apiSerialize(resJson, VALUE_TYPE_FIELD, replace(k, v));
break;
default:
apiSerialize(resJson, VALUE_TYPE_FIELD, put(k, v));
break;
}
} else {
apiSerialize(resJson, VALUE_TYPE_FIELD, replace(k, apiDeserialize(reqJson, VALUE_TYPE_FIELD, concurrentValue), v));
}
response.jsonBody(resJson);
});
} else {
apiServer = null;
}
}
@Override
protected void freeObjects() {
indexer.close();
wal.close();
}
private void apiCheck(ServerRequest req) {
if (Strings.isEmpty(config.getApiPassword())) {
return;
}
if (!eq(config.getApiPassword(), req.getHeaders().get("apiPassword"))) {
throw new InvalidException("{} auth fail", req.getRemoteEndpoint()).level(ExceptionLevel.USER_OPERATION);
}
}
@SneakyThrows
private T apiDeserialize(JSONObject reqJson, String typeField, Object obj) {
if (obj instanceof byte[]) {
byte[] bytes = (byte[]) obj;
return serializer.deserialize(IOStream.wrap(null, bytes));
}
String type = reqJson.getString(typeField);
return type == null ? (T) obj : fromJson(obj, Reflects.loadClass(type, false));
}
private void apiSerialize(JSONObject resJson, String typeField, Object obj) {
resJson.put("code", 0);
if (obj == null) {
return;
}
if (config.isApiReturnJson()) {
resJson.put(typeField, obj.getClass().getName());
resJson.put("value", obj);
} else {
resJson.put("value", serializer.serializeToBytes(obj));
}
}
protected void write(TK k, TV v) {
boolean incr = false;
HashKeyIndexer.KeyData key = indexer.findKey(k);
if (key == null) {
key = new HashKeyIndexer.KeyData<>(k);
incr = true;
}
if (key.logPosition == TOMB_MARK) {
if (v == null) {
return;
}
incr = true;
}
Entry val = new Entry<>(k, v);
HashKeyIndexer.KeyData finalKey = key;
wal.lock.writeInvoke(() -> {
saveValue(finalKey, val);
indexer.saveKey(finalKey);
});
if (incr) {
wal.meta.incrementSize();
}
}
protected TV delete(TK k) {
HashKeyIndexer.KeyData key = indexer.findKey(k);
if (key == null || key.logPosition == TOMB_MARK) {
return null;
}
Entry val = findValue(key);
if (val == null) {
return null;
}
val.value = null;
wal.lock.writeInvoke(() -> {
saveValue(key, val);
indexer.saveKey(key);
});
wal.meta.decrementSize();
return val.value;
}
protected TV read(TK k) {
HashKeyIndexer.KeyData key = indexer.findKey(k);
if (key == null || key.logPosition == TOMB_MARK) {
return null;
}
Entry val = findValue(key);
return val != null ? val.value : null;
}
private void saveValue(HashKeyIndexer.KeyData key, Entry value) {
checkNotClosed();
require(key, !(key.logPosition == TOMB_MARK && value.value == null));
key.logPosition = wal.meta.getLogPosition();
serializer.serialize(value, wal);
int size = (int) (wal.meta.getLogPosition() - key.logPosition);
wal.writeInt(size);
if (value.value == null) {
log.debug("LogPos auto set TOMB_MARK {}", key);
key.logPosition = TOMB_MARK;
}
log.debug("saveValue {} {}", key, value);
}
private Entry findValue(HashKeyIndexer.KeyData key) {
// require(key, key.logPosition >= 0);
if (key.logPosition == TOMB_MARK) {
log.warn("LogPosError {} == TOMB_MARK", key);
return null;
}
if (key.logPosition > wal.meta.getLogPosition()) {
log.warn("LogPosError {} > {}", key, wal.meta.getLogPosition());
key.logPosition = TOMB_MARK;
indexer.saveKey(key);
return null;
}
return findValue(key.logPosition, key.key, null);
}
@SneakyThrows
private Entry findValue(long logPosition, TK k, $ position) {
String kStr = k == null ? "NULL" : k.toString();
log.debug("findValue {} {}", kStr, logPosition);
Entry val = null;
try {
wal.setReaderPosition(logPosition);
val = serializer.deserialize(wal, true);
} catch (Exception e) {
if (e instanceof StreamCorruptedException
// | e instanceof EOFException
) {
log.error("findValue {} {}", kStr, logPosition, e);
} else {
throw e;
}
} finally {
long readerPosition = wal.getReaderPosition(true);
if (position != null) {
position.v = readerPosition;
}
}
if (val == null || val.value == null) {
return null;
}
if (k != null && !k.equals(val.key)) {
AtomicInteger counter = (AtomicInteger) wal.meta.extra;
int total = counter == null ? -1 : counter.incrementAndGet();
log.warn("LogPosError hash collision {} total={}", k, total);
Files.createDirectory("./hc.err");
return null;
}
return val;
}
@Override
public Iterator> iterator() {
return iterator(0, DEFAULT_ITERATOR_SIZE);
}
public Iterator> iterator(int offset, int size) {
require(offset, offset >= 0);
require(size, size >= 0);
int total = size();
if (total <= offset) {
return IteratorUtils.emptyIterator();
}
IteratorContext ctx = new IteratorContext(new HashSet<>(offset + size), new Entry[config.getIteratorPrefetchCount()]);
if (offset > 0 && !backwardFindValue(ctx, offset)) {
return IteratorUtils.emptyIterator();
}
backwardFindValue(ctx, ctx.buf.length);
if (ctx.writePos == 0) {
return IteratorUtils.emptyIterator();
}
ctx.remaining = size;
return new AbstractSequentialIterator>(ctx.buf[ctx.readPos]) {
@Override
protected Map.Entry computeNext(Map.Entry current) {
if (--ctx.remaining <= 0) {
return null;
}
while (true) {
if (++ctx.readPos == ctx.buf.length) {
backwardFindValue(ctx, Math.min(ctx.buf.length, ctx.remaining));
if (ctx.writePos == 0) {
return null;
}
}
Entry entry = ctx.buf[ctx.readPos];
if (entry == null) {
continue;
}
return entry;
}
}
};
}
private boolean backwardFindValue(IteratorContext ctx, int prefetchCount) {
wal.setReaderPosition(ctx.logPos); //4 lock
return wal.backwardReadObject(reader -> {
ctx.writePos = ctx.readPos = 0;
for (int i = 0; i < prefetchCount; i++) {
if (ctx.logPos <= WALFileStream.HEADER_SIZE) {
ctx.remaining = 0;
return false;
}
ctx.logPos -= 4;
reader.setPosition(ctx.logPos);
try {
int size = reader.readInt();
log.debug("contentLength: {}", size);
ctx.logPos -= size;
reader.setPosition(ctx.logPos);
Entry val = serializer.deserialize(reader, true);
log.debug("read {}", val);
TV v = queue.peek(val.key);
if (v != null) {
val.value = v;
}
if (!ctx.filter.add(val.key)) {
log.debug("skip read {}", val.key);
val = null;
}
ctx.buf[ctx.writePos++] = val;
} catch (Exception e) {
if (e instanceof StreamCorruptedException | e instanceof EOFException) {
ctx.remaining = 0;
return false;
}
throw e;
}
}
return true;
});
}
@Override
public int size() {
return wal.meta.getSize();
}
@Override
public boolean containsKey(Object key) {
TK k = (TK) key;
TV v = queue.peek(k);
if (v != null) {
return true;
}
return indexer.findKey((TK) key) != null;
}
@Override
public TV get(Object key) {
TK k = (TK) key;
TV v = queue.peek(k);
if (v != null) {
return v;
}
return read(k);
}
@Override
public TV put(TK key, TV value) {
TV old = read(key);
if (!eq(old, value)) {
write(key, value);
}
return old;
}
public void putBehind(TK key, TV value) {
queue.offer(key, value, v -> put(key, v));
}
@Override
public TV remove(Object key) {
TK k = (TK) key;
queue.remove(k);
return delete(k);
}
@Override
public void clear() {
wal.lock.writeInvoke(() -> {
queue.reset();
indexer.clear();
wal.clear();
});
}
@Override
public Set> entrySet() {
return entrySet(0, DEFAULT_ITERATOR_SIZE);
}
public Set> entrySet(int offset, int size) {
return new LinkedHashSet<>(IteratorUtils.toList(iterator(offset, size)));
}
}