/*
* 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.ignite.internal.processors.datastructures;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Map;
import java.util.UUID;
import org.apache.ignite.internal.processors.cache.GridCacheInternal;
import org.apache.ignite.internal.util.tostring.GridToStringInclude;
import org.apache.ignite.internal.util.typedef.internal.S;
import org.apache.ignite.internal.util.typedef.internal.U;
/**
* Grid cache reentrant lock state.
*/
public final class GridCacheLockState implements GridCacheInternal, Externalizable, Cloneable {
/** */
private static final long serialVersionUID = 0L;
/** Count. */
private int cnt;
/** Owner thread local ID. */
private long threadId;
/** Owner node ID. */
private UUID id;
/** FailoverSafe flag. */
private boolean failoverSafe;
/** Map containing state for each condition object associated with this lock. */
@GridToStringInclude
private Map<String, LinkedList<UUID>> conditionMap;
/** Map containing unprocessed signals for condition objects that are associated with this lock. */
@GridToStringInclude
private Map<UUID, LinkedList<String>> signals;
/** Flag indicating lock fairness. */
private boolean fair;
/** Queue containing nodes that are waiting to acquire this lock, used to ensure fairness. */
@GridToStringInclude
private LinkedList<UUID> nodes;
/**
* Flag indicating that global state changed.
* Used in fair mode to ensure that only successful acquires and releases trigger update.
*/
private boolean changed;
/**
* Constructor.
*
* @param cnt Initial count.
* @param id UUID of owning node.
* @param threadID ID of the current thread.
* @param failoverSafe true if created in failoverSafe mode.
* @param fair true if created in fair mode.
*/
public GridCacheLockState(int cnt, UUID id, long threadID, boolean failoverSafe, boolean fair) {
assert cnt >= 0;
this.id = id;
this.threadId = threadID;
conditionMap = new HashMap();
signals = null;
nodes = new LinkedList<UUID>();
this.fair = fair;
this.failoverSafe = failoverSafe;
}
/**
* Empty constructor required for {@link Externalizable}.
*/
public GridCacheLockState() {
// No-op.
}
/**
* @param cnt New count.
*/
public void set(int cnt) {
this.cnt = cnt;
}
/**
* @return Current count.
*/
public int get() {
return cnt;
}
/**
* @return Current owner thread ID.
*/
public long getThreadId() {
return threadId;
}
/**
* @param threadId New thread owner ID.
*/
public void setThreadId(long threadId) {
this.threadId = threadId;
}
/**
* @return Current owner node ID.
*/
public UUID getId() {
return id;
}
/**
* @param id New owner node ID.
*/
public void setId(UUID id) {
this.id = id;
}
/**
* @return Failover safe flag.
*/
public boolean isFailoverSafe() {
return failoverSafe;
}
/**
* @return Condition count.
*/
public int condtionCount(){
return conditionMap.size();
}
/**
* @return Condition map.
*/
public Map<String, LinkedList<UUID>> getConditionMap() {
return conditionMap;
}
/**
* @param conditionMap Condition map.
*/
public void setConditionMap(Map<String, LinkedList<UUID>> conditionMap) {
this.conditionMap = conditionMap;
}
/**
* @return Signals.
*/
public Map<UUID, LinkedList<String>> getSignals() {
return signals;
}
/**
* @param signals Signals.
*/
public void setSignals(Map<UUID, LinkedList<String>> signals) {
this.signals = signals;
}
/**
* @return Nodes.
*/
public LinkedList<UUID> getNodes() {
return nodes;
}
/**
* @param nodes Nodes.
*/
public void setNodes(LinkedList<UUID> nodes) {
this.nodes = nodes;
}
/**
* @return Fair flag.
*/
public boolean isFair() {
return fair;
}
/**
* @return Changed flag.
*/
public boolean isChanged() {
return changed;
}
/**
* @param changed Changed flag.
*/
public void setChanged(boolean changed) {
this.changed = changed;
}
/** {@inheritDoc} */
@Override public Object clone() throws CloneNotSupportedException {
return super.clone();
}
/** {@inheritDoc} */
@Override public void writeExternal(ObjectOutput out) throws IOException {
out.writeInt(cnt);
out.writeLong(threadId);
U.writeUuid(out, id);
out.writeBoolean(failoverSafe);
out.writeBoolean(fair);
out.writeBoolean(changed);
out.writeBoolean(conditionMap != null);
if (conditionMap != null) {
out.writeInt(conditionMap.size());
for (Map.Entry<String, LinkedList<UUID>> e : conditionMap.entrySet()) {
U.writeString(out, e.getKey());
out.writeInt(e.getValue().size());
for (UUID uuid:e.getValue())
U.writeUuid(out, uuid);
}
}
out.writeBoolean(signals != null);
if (signals != null) {
out.writeInt(signals.size());
for (Map.Entry<UUID, LinkedList<String>> e : signals.entrySet()) {
U.writeUuid(out, e.getKey());
out.writeInt(e.getValue().size());
for (String condition:e.getValue())
U.writeString(out, condition);
}
}
out.writeBoolean(nodes != null);
if (nodes != null) {
out.writeInt(nodes.size());
for (UUID uuid: nodes)
U.writeUuid(out, uuid);
}
}
/** {@inheritDoc} */
@Override public void readExternal(ObjectInput in) throws IOException {
cnt = in.readInt();
threadId = in.readLong();
id = U.readUuid(in);
failoverSafe = in.readBoolean();
fair = in.readBoolean();
changed = in.readBoolean();
if (in.readBoolean()) {
int size = in.readInt();
conditionMap = U.newLinkedHashMap(size);
for (int i = 0; i < size; i++) {
String key = U.readString(in);
int size1 = in.readInt();
LinkedList<UUID> list = new LinkedList();
for (int j = 0; j < size1; j++)
list.add(U.readUuid(in));
conditionMap.put(key, list);
}
}
if (in.readBoolean()) {
assert (conditionMap != null);
int size = in.readInt();
signals = U.newLinkedHashMap(size);
for (int i = 0; i < size; i++) {
UUID node = U.readUuid(in);
int size1 = in.readInt();
LinkedList<String> list = new LinkedList();
for (int j = 0; j < size1; j++)
list.add(U.readString(in));
signals.put(node, list);
}
}
else
signals = null;
if (in.readBoolean()) {
int size = in.readInt();
nodes = new LinkedList();
for (int i = 0; i < size; i++)
nodes.add(U.readUuid(in));
}
else
nodes = null;
}
/** {@inheritDoc} */
@Override public String toString() {
return S.toString(GridCacheLockState.class, this);
}
}