net.spy.memcached.protocol.ascii.BTreeGetBulkOperationImpl 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 net.spy.memcached.KeyUtil;
import net.spy.memcached.collection.BTreeGetBulk;
import net.spy.memcached.collection.CollectionResponse;
import net.spy.memcached.ops.APIType;
import net.spy.memcached.ops.BTreeGetBulkOperation;
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;
/**
* Operation to retrieve b+tree data with multiple keys
*/
public class BTreeGetBulkOperationImpl extends OperationImpl implements
BTreeGetBulkOperation {
private final ByteArrayOutputStream byteBuffer = new ByteArrayOutputStream();
private static final OperationStatus GET_CANCELED = new CollectionOperationStatus(
false, "collection canceled", CollectionResponse.CANCELED);
private static final OperationStatus END = new CollectionOperationStatus(
true, "END", CollectionResponse.END);
private static final OperationStatus OK = new CollectionOperationStatus(
true, "OK", CollectionResponse.OK);
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 NOT_FOUND_ELEMENT = new CollectionOperationStatus(
false, "NOT_FOUND_ELEMENT", CollectionResponse.NOT_FOUND_ELEMENT);
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.TYPE_MISMATCH);
private static final OperationStatus UNREADABLE = new CollectionOperationStatus(
false, "UNREADABLE", CollectionResponse.UNREADABLE);
protected final BTreeGetBulk getBulk;
protected int flags = 0;
protected byte[] data = null;
protected int readOffset = 0;
protected byte lookingFor = '\0';
protected int spaceCount = 0;
protected int elementCount = 0;
public BTreeGetBulkOperationImpl(BTreeGetBulk getBulk, OperationCallback cb) {
super(cb);
this.getBulk = getBulk;
setAPIType(APIType.BOP_GET);
setOperationType(OperationType.READ);
}
public void handleLine(String line) {
getLogger().debug("Got line %s", line);
/*
VALUE [ ]\r\n
ELEMENT [] \r\n
[ ... ]
END\r\n
*/
if (line.startsWith("VALUE ")) {
readKey(line);
if (elementCount > 0) {
setReadType(OperationReadType.DATA);
}
} else {
OperationStatus status = matchStatus(line, END);
getLogger().debug(status);
getCallback().receivedStatus(status);
transitionState(OperationState.COMPLETE);
}
}
@Override
public final void handleRead(ByteBuffer bb) {
readValue(bb);
if (elementCount == 0) {
setReadType(OperationReadType.LINE);
}
}
private final void readKey(String line) {
String[] chunk = line.split(" ");
OperationStatus status = matchStatus(chunk[2], OK, TRIMMED, NOT_FOUND,
NOT_FOUND_ELEMENT, OUT_OF_RANGE, TYPE_MISMATCH, BKEY_MISMATCH,
UNREADABLE);
getBulk.decodeKeyHeader(line);
elementCount = (chunk.length > 3) ? Integer.parseInt(chunk[4]) : 0;
BTreeGetBulkOperation.Callback cb = ((BTreeGetBulkOperation.Callback) getCallback());
cb.gotKey(chunk[1], elementCount, status);
}
private final void readValue(ByteBuffer bb) {
if (lookingFor == '\0' && data == null) {
for (int i = 0; bb.remaining() > 0; i++) {
byte b = bb.get();
// Handle spaces.
if (b == ' ') {
spaceCount++;
String l = new String(byteBuffer.toByteArray());
if (l.startsWith("ELEMENT")) {
// ELEMENT [] \r\n
if (getBulk.elementHeaderReady(spaceCount)) {
if (spaceCount == 3 && l.split(" ")[2].startsWith("0x")) {
byteBuffer.write(b);
continue;
}
getBulk.decodeItemHeader(l);
data = new byte[getBulk.getDataLength()];
byteBuffer.reset();
spaceCount = 0;
break;
}
}
}
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;
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);
getLogger().debug("Reading %d bytes", toRead);
bb.get(data, readOffset, toRead);
readOffset += toRead;
}
if (lookingFor == '\0' && readOffset == data.length) {
BTreeGetBulkOperation.Callback cb = (BTreeGetBulkOperation.Callback) getCallback();
cb.gotElement(
getBulk.getKey(), getBulk.getSubkey(), getBulk.getFlag(), getBulk.getEFlag(), 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;
elementCount--;
}
}
}
public void initialize() {
String cmd = getBulk.getCommand();
if (getHandlingNode() == null || getHandlingNode().enabledSpaceSeparate()) {
getBulk.setKeySeparator(" ");
} else {
getBulk.setKeySeparator(",");
}
String args = getBulk.stringify();
ByteBuffer bb = ByteBuffer.allocate(cmd.length() + args.length()
+ KeyUtil.getKeyBytes(getBulk.getSpaceSeparatedKeys()).length + 16);
setArguments(bb, cmd, args);
setArguments(bb, getBulk.getSpaceSeparatedKeys());
((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);
}
public Collection getKeys() {
return getBulk.getKeyList();
}
@Override
public boolean isBulkOperation() {
return true;
}
@Override
public boolean isPipeOperation() {
return false;
}
}