net.spy.memcached.protocol.ascii.CollectionGetOperationImpl 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.BTreeGet;
import net.spy.memcached.collection.CollectionGet;
import net.spy.memcached.collection.CollectionResponse;
import net.spy.memcached.collection.ListGet;
import net.spy.memcached.collection.SetGet;
import net.spy.memcached.collection.MapGet;
import net.spy.memcached.ops.APIType;
import net.spy.memcached.ops.CollectionGetOperation;
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 collection data in a memcached server.
*/
public class CollectionGetOperationImpl extends OperationImpl
implements CollectionGetOperation {
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 DELETED = new CollectionOperationStatus(
true, "DELETED", CollectionResponse.DELETED);
private static final OperationStatus DELETED_DROPPED = new CollectionOperationStatus(
true, "DELETED_DROPPED", CollectionResponse.DELETED_DROPPED);
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.BKEY_MISMATCH);
private static final OperationStatus UNREADABLE = new CollectionOperationStatus(
false, "UNREADABLE", CollectionResponse.UNREADABLE);
protected final String key;
protected final CollectionGet collectionGet;
protected int flags = 0;
protected int count = 0;
protected byte[] data = null;
protected int readOffset = 0;
protected byte lookingFor = '\0';
protected int spaceCount = 0;
public CollectionGetOperationImpl(String key, CollectionGet collectionGet,
OperationCallback cb) {
super(cb);
this.key = key;
this.collectionGet = collectionGet;
if (this.collectionGet instanceof ListGet) {
setAPIType(APIType.LOP_GET);
} else if (this.collectionGet instanceof SetGet) {
setAPIType(APIType.SOP_GET);
} else if (this.collectionGet instanceof MapGet) {
setAPIType(APIType.MOP_GET);
} else if (this.collectionGet instanceof BTreeGet) {
setAPIType(APIType.BOP_GET);
}
if (collectionGet.isDelete()) {
setOperationType(OperationType.WRITE);
} else {
setOperationType(OperationType.READ);
}
}
public void handleLine(String line) {
/* ENABLE_REPLICATION if */
if (line.equals("SWITCHOVER") || line.equals("REPL_SLAVE")) {
receivedMoveOperations(line);
return;
}
/* ENABLE_REPLICATION end */
/*
VALUE \r\n
\r\n
[ ... ]
END|TRIMMED|DELETED|DELETED_DROPPED\r\n
*/
if (line.startsWith("VALUE ")) {
// Response header
getLogger().debug("Got line %s", line);
String[] stuff = line.split(" ");
assert "VALUE".equals(stuff[0]);
flags = Integer.parseInt(stuff[1]);
count = Integer.parseInt(stuff[2]);
setReadType(OperationReadType.DATA);
} else {
OperationStatus status = matchStatus(line, END, TRIMMED, DELETED,
DELETED_DROPPED, NOT_FOUND, NOT_FOUND_ELEMENT,
OUT_OF_RANGE, TYPE_MISMATCH, BKEY_MISMATCH, UNREADABLE);
getLogger().debug(status);
getCallback().receivedStatus(status);
transitionState(OperationState.COMPLETE);
return;
}
}
@Override
public final void handleRead(ByteBuffer bb) {
// Decode a collection data header.
if (lookingFor == '\0' && data == null) {
for (int i = 0; bb.remaining() > 0; i++) {
byte b = bb.get();
// Handle spaces.
if (b == ' ') {
spaceCount++;
if (collectionGet.headerReady(spaceCount)) {
/*
btree: [] \r\n
list: \r\n
set: \r\n
map: \r\n
*/
collectionGet.decodeItemHeader(new String(byteBuffer.toByteArray()));
byteBuffer.reset();
if (collectionGet.headerReady(spaceCount)
&& collectionGet.eachRecordParseCompleted()) {
// if (collectionGet.getElementFlag() != null) {
// collectionGet.setHeaderCount(collectionGet
// .getHeaderCount() - 1);
// }
data = new byte[collectionGet.getDataLength()];
spaceCount = 0;
break;
}
}
}
// Ready to finish.
if (b == '\r') {
continue;
}
// Finish the operation.
if (b == '\n') {
OperationStatus status = matchStatus(byteBuffer.toString(),
END, TRIMMED, DELETED, DELETED_DROPPED, NOT_FOUND,
NOT_FOUND_ELEMENT, OUT_OF_RANGE, TYPE_MISMATCH,
BKEY_MISMATCH, UNREADABLE);
getLogger().debug("Get complete!");
getCallback().receivedStatus(status);
transitionState(OperationState.COMPLETE);
data = null;
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) {
CollectionGetOperation.Callback cb =
(CollectionGetOperation.Callback) getCallback();
cb.gotData(key, collectionGet.getSubkey(), flags, 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;
}
}
}
public void initialize() {
String cmd = collectionGet.getCommand();
if (collectionGet instanceof MapGet) {
MapGet mapGet = (MapGet) collectionGet;
if (getHandlingNode() == null || getHandlingNode().enabledSpaceSeparate()) {
mapGet.setKeySeparator(" ");
} else {
mapGet.setKeySeparator(",");
}
}
String args = collectionGet.stringify();
byte[] additionalArgs = collectionGet.getAddtionalArgs();
ByteBuffer bb = ByteBuffer.allocate(
KeyUtil.getKeyBytes(key).length + cmd.length() + args.length() +
(additionalArgs == null ? 0 : additionalArgs.length) + 16);
setArguments(bb, cmd, key, args);
if (additionalArgs != null) {
bb.put(additionalArgs);
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);
}
public Collection getKeys() {
return Collections.singleton(key);
}
public CollectionGet getGet() {
return collectionGet;
}
@Override
public boolean isBulkOperation() {
return false;
}
@Override
public boolean isPipeOperation() {
return false;
}
}