net.spy.memcached.protocol.ascii.BTreeInsertAndGetOperationImpl Maven / Gradle / Ivy
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/*
* arcus-java-client : Arcus Java client
* Copyright 2010-2014 NAVER Corp.
* Copyright 2014-2021 JaM2in Co., Ltd.
*
* 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 net.spy.memcached.protocol.ascii;
import java.io.ByteArrayOutputStream;
import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.util.Collection;
import java.util.Collections;
import net.spy.memcached.KeyUtil;
import net.spy.memcached.collection.BTreeGetByPosition;
import net.spy.memcached.collection.BTreeInsertAndGet;
import net.spy.memcached.collection.CollectionResponse;
import net.spy.memcached.ops.APIType;
import net.spy.memcached.ops.BTreeInsertAndGetOperation;
import net.spy.memcached.ops.CollectionOperationStatus;
import net.spy.memcached.ops.OperationCallback;
import net.spy.memcached.ops.OperationState;
import net.spy.memcached.ops.OperationStatus;
import net.spy.memcached.ops.OperationType;
public class BTreeInsertAndGetOperationImpl extends OperationImpl implements
BTreeInsertAndGetOperation {
private static final int OVERHEAD = 32;
private final ByteArrayOutputStream byteBuffer = new ByteArrayOutputStream();
private static final OperationStatus GET_CANCELED = new CollectionOperationStatus(
false, "collection canceled", CollectionResponse.CANCELED);
private static final OperationStatus CREATED_STORED = new CollectionOperationStatus(
true, "CREATED_STORED", CollectionResponse.CREATED_STORED);
private static final OperationStatus STORED = new CollectionOperationStatus(
true, "STORED", CollectionResponse.STORED);
private static final OperationStatus REPLACED = new CollectionOperationStatus(
true, "REPLACED", CollectionResponse.REPLACED);
private static final OperationStatus TRIMMED = new CollectionOperationStatus(
true, "TRIMMED", CollectionResponse.TRIMMED);
private static final OperationStatus NOT_FOUND = new CollectionOperationStatus(
false, "NOT_FOUND", CollectionResponse.NOT_FOUND);
private static final OperationStatus ELEMENT_EXISTS = new CollectionOperationStatus(
false, "ELEMENT_EXISTS", CollectionResponse.ELEMENT_EXISTS);
private static final OperationStatus OVERFLOWED = new CollectionOperationStatus(
false, "OVERFLOWED", CollectionResponse.OVERFLOWED);
private static final OperationStatus OUT_OF_RANGE = new CollectionOperationStatus(
false, "OUT_OF_RANGE", CollectionResponse.OUT_OF_RANGE);
private static final OperationStatus TYPE_MISMATCH = new CollectionOperationStatus(
false, "TYPE_MISMATCH", CollectionResponse.TYPE_MISMATCH);
private static final OperationStatus BKEY_MISMATCH = new CollectionOperationStatus(
false, "BKEY_MISMATCH", CollectionResponse.BKEY_MISMATCH);
private static final OperationStatus UNDEFINED_OPERATION = new CollectionOperationStatus(
false, "UNDEFINED_OPERATION", CollectionResponse.UNDEFINED);
private static final OperationStatus[] INSERT_AND_GET_STATUS_ON_LINE = {
STORED, CREATED_STORED, NOT_FOUND, ELEMENT_EXISTS, OVERFLOWED,
OUT_OF_RANGE, TYPE_MISMATCH, BKEY_MISMATCH
};
private static final OperationStatus[] UPSERT_AND_GET_STATUS_ON_LINE = {
STORED, CREATED_STORED, REPLACED, NOT_FOUND, OVERFLOWED,
OUT_OF_RANGE, TYPE_MISMATCH, BKEY_MISMATCH
};
private static final OperationStatus[] STORE_AND_GET_ON_DATA = {TRIMMED};
protected final String key;
protected final BTreeInsertAndGet get;
protected final byte[] dataToStore;
protected int flags = 0;
protected int count = 0;
protected byte[] data = null;
protected int readOffset = 0;
protected byte lookingFor = '\0';
protected int spaceCount = 0;
private Boolean hasEFlag = null;
public BTreeInsertAndGetOperationImpl(String key, BTreeInsertAndGet get,
byte[] dataToStore, OperationCallback cb) {
super(cb);
this.key = key;
this.get = get;
this.dataToStore = dataToStore;
if (get.getCmd() == BTreeInsertAndGet.Command.INSERT) {
setAPIType(APIType.BOP_INSERT);
} else if (get.getCmd() == BTreeInsertAndGet.Command.UPSERT) {
setAPIType(APIType.BOP_UPSERT);
}
setOperationType(OperationType.WRITE);
}
@Override
public BTreeInsertAndGet getGet() {
return get;
}
@Override
public void handleLine(String line) {
if (getLogger().isDebugEnabled()) {
getLogger().debug("Got line %s", line);
}
/* ENABLE_REPLICATION if */
if (line.equals("SWITCHOVER") || line.equals("REPL_SLAVE")) {
receivedMoveOperations(line);
return;
}
/* ENABLE_REPLICATION end */
/*
VALUE \r\n
[] \r\n
END\r\n
*/
if (line.startsWith("VALUE ")) {
String[] stuff = line.split(" ");
assert stuff.length == 3;
assert "VALUE".equals(stuff[0]);
flags = Integer.parseInt(stuff[1]);
count = Integer.parseInt(stuff[2]);
if (count > 0) {
// start to read actual data
setReadType(OperationReadType.DATA);
}
} else {
OperationStatus status = null;
switch (get.getCmd()) {
case INSERT:
status = matchStatus(line, INSERT_AND_GET_STATUS_ON_LINE);
break;
case UPSERT:
status = matchStatus(line, UPSERT_AND_GET_STATUS_ON_LINE);
break;
default:
status = UNDEFINED_OPERATION;
}
if (getLogger().isDebugEnabled()) {
getLogger().debug(status);
}
getCallback().receivedStatus(status);
transitionState(OperationState.COMPLETE);
return;
}
}
@Override
public void handleRead(ByteBuffer bb) {
// Decode a data header.
if (lookingFor == '\0' && data == null) {
for (int i = 0; bb.remaining() > 0; i++) {
byte b = bb.get();
// Handle spaces to parse the header.
if (b == ' ') {
// One-time check to find if this responses have eflags.
if (hasEFlag == null && spaceCount == BTreeGetByPosition.HEADER_EFLAG_POSITION + 1) {
String[] chunk = new String(byteBuffer.toByteArray())
.split(" ");
if (chunk[BTreeGetByPosition.HEADER_EFLAG_POSITION].startsWith("0x")) {
hasEFlag = true;
} else {
hasEFlag = false;
}
}
spaceCount++;
// Parse the value header.
// FIXME this is not cool... please fix this :-(
int spaceReduced = (hasEFlag != null && hasEFlag) ? 1 : 0;
if (get.headerReady(spaceCount - spaceReduced)) {
// [] \r\n
get.decodeItemHeader(new String(byteBuffer.toByteArray()));
data = new byte[get.getBytes()];
byteBuffer.reset();
spaceCount = 0;
hasEFlag = null;
break;
}
}
// Ready to finish.
if (b == '\r') {
continue;
}
// Finish the operation.
if (b == '\n') {
OperationStatus status = matchStatus(byteBuffer.toString(), STORE_AND_GET_ON_DATA);
if (getLogger().isDebugEnabled()) {
getLogger().debug("Get complete!");
}
getCallback().receivedStatus(status);
transitionState(OperationState.COMPLETE);
data = null;
break;
}
// Write to the result ByteBuffer
byteBuffer.write(b);
}
return;
}
// Read data
assert key != null;
assert data != null;
// This will be the case, because we'll clear them when it's not.
assert readOffset <= data.length
: "readOffset is " + readOffset + " data.length is " + data.length;
if (getLogger().isDebugEnabled()) {
getLogger().debug("readOffset: %d, length: %d", readOffset, data.length);
}
if (lookingFor == '\0') {
int toRead = data.length - readOffset;
int available = bb.remaining();
toRead = Math.min(toRead, available);
if (getLogger().isDebugEnabled()) {
getLogger().debug("Reading %d bytes", toRead);
}
bb.get(data, readOffset, toRead);
readOffset += toRead;
}
if (lookingFor == '\0' && readOffset == data.length) {
// put an element data.
BTreeInsertAndGetOperation.Callback cb = (BTreeInsertAndGetOperation.Callback) getCallback();
cb.gotData(key, flags, get.getBkeyObject(), get.getElementFlag(), data);
lookingFor = '\r';
}
if (lookingFor != '\0' && bb.hasRemaining()) {
do {
byte tmp = bb.get();
assert tmp == lookingFor : "Expecting " + lookingFor + ", got "
+ (char) tmp;
switch (lookingFor) {
case '\r':
lookingFor = '\n';
break;
case '\n':
lookingFor = '\0';
break;
default:
assert false : "Looking for unexpected char: "
+ (char) lookingFor;
}
} while (lookingFor != '\0' && bb.hasRemaining());
if (lookingFor == '\0') {
data = null;
readOffset = 0;
}
}
}
@Override
public void initialize() {
String args = get.stringify();
ByteBuffer bb = ByteBuffer.allocate(dataToStore.length
+ KeyUtil.getKeyBytes(key).length
+ KeyUtil.getKeyBytes(get.getBkeyObject().getBKeyAsString()).length
+ KeyUtil.getKeyBytes(get.getElementFlagByHex()).length
+ args.length()
+ OVERHEAD);
setArguments(bb, get.getCommand(), key, get.getBkeyObject().getBKeyAsString(),
get.getElementFlagByHex(), dataToStore.length, args);
bb.put(dataToStore);
bb.put(CRLF);
((Buffer) bb).flip();
setBuffer(bb);
if (getLogger().isDebugEnabled()) {
getLogger().debug(
"Request in ascii protocol: "
+ (new String(bb.array()))
.replace("\r\n", "\\r\\n"));
}
}
@Override
protected void wasCancelled() {
getCallback().receivedStatus(GET_CANCELED);
}
@Override
public Collection getKeys() {
return Collections.singleton(key);
}
@Override
public boolean isBulkOperation() {
return false;
}
@Override
public boolean isPipeOperation() {
return false;
}
}