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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing
/*
* 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.geode.internal.cache;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.Hashtable;
import java.util.Map;
import org.apache.geode.DataSerializable;
import org.apache.geode.cache.CacheStatistics;
import org.apache.geode.cache.EntryDestroyedException;
import org.apache.geode.cache.Region;
import org.apache.geode.cache.StatisticsDisabledException;
import org.apache.geode.internal.cache.versions.VersionStamp;
import org.apache.geode.internal.cache.versions.VersionTag;
import org.apache.geode.internal.i18n.LocalizedStrings;
/**
* A Region.Entry implementation for remote entries and all PR entries
*
* @since GemFire 5.1
*/
public class EntrySnapshot implements Region.Entry, DataSerializable {
private static final long serialVersionUID = -2139749921655693280L;
/**
* True if at the time this entry was created it represented a local data store. False if it was
* fetched remotely. This field is used by unit tests.
*/
private boolean startedLocal;
/** whether this entry has been destroyed */
private boolean entryDestroyed;
public transient LocalRegion region = null;
/**
* the internal entry for this Entry's key
*/
public transient NonLocalRegionEntry regionEntry; // would be final except for serialization
// needing default constructor
/**
* creates a new Entry that wraps the given RegionEntry object for the given storage Region
*
* @param allowTombstones TODO
*/
public EntrySnapshot(RegionEntry regionEntry, LocalRegion dataRegion, LocalRegion region,
boolean allowTombstones) {
this.region = region;
if (regionEntry instanceof NonLocalRegionEntry) {
this.regionEntry = (NonLocalRegionEntry) regionEntry;
this.startedLocal = false;
} else {
this.startedLocal = true;
// note we always make these non-local now to handle PR buckets moving
// out from under this Region.Entry.
if (regionEntry.hasStats()) {
this.regionEntry =
new NonLocalRegionEntryWithStats(regionEntry, dataRegion, allowTombstones);
} else {
this.regionEntry = new NonLocalRegionEntry(regionEntry, dataRegion, allowTombstones);
}
}
}
/**
* Used by unit tests. Only available on PR. If, at the time this entry was created, it was
* initialized from a local data store then this method returns true.
*
* @since GemFire 6.0
*/
public boolean wasInitiallyLocal() {
return this.startedLocal;
}
public Object getKey() {
checkEntryDestroyed();
return regionEntry.getKey();
}
public VersionTag getVersionTag() {
VersionStamp stamp = regionEntry.getVersionStamp();
if (stamp != null) {
return stamp.asVersionTag();
}
return null;
}
public Object getRawValue() {
Object v = this.regionEntry.getValue(null);
if (v == null) {
return null;
}
if (v instanceof CachedDeserializable) {
if (region.isCopyOnRead()) {
v = ((CachedDeserializable) v).getDeserializedWritableCopy(null, null);
} else {
v = ((CachedDeserializable) v).getDeserializedValue(null, null);
}
if (v == Token.INVALID || v == Token.LOCAL_INVALID) {
v = null;
}
} else {
if (v == Token.INVALID || v == Token.LOCAL_INVALID) {
v = null;
} else {
v = conditionalCopy(v);
}
}
return v;
}
public Object getValue() {
checkEntryDestroyed();
return getRawValue();
}
/**
* Makes a copy, if copy-on-get is enabled, of the specified object.
*
* @since GemFire 4.0
*/
private Object conditionalCopy(Object o) {
return o;
}
public Object getUserAttribute() {
checkEntryDestroyed();
Map userAttr = region.entryUserAttributes;
if (userAttr == null) {
return null;
}
return userAttr.get(this.regionEntry.getKey());
}
public Object setUserAttribute(Object value) {
checkEntryDestroyed();
if (region.entryUserAttributes == null) {
region.entryUserAttributes = new Hashtable();
}
return region.entryUserAttributes.put(this.regionEntry.getKey(), value);
}
public boolean isDestroyed() {
if (this.entryDestroyed) {
return true;
}
if (region.isDestroyed()) {
this.entryDestroyed = true;
} else if (this.regionEntry.isRemoved()) {
this.entryDestroyed = true;
}
// else the entry is somewhere else and we don't know if it's destroyed
return this.entryDestroyed;
}
public Region getRegion() {
checkEntryDestroyed();
return region;
}
public CacheStatistics getStatistics() throws StatisticsDisabledException {
checkEntryDestroyed();
if (!regionEntry.hasStats() || !region.statisticsEnabled) {
throw new StatisticsDisabledException(
LocalizedStrings.PartitionedRegion_STATISTICS_DISABLED_FOR_REGION_0
.toLocalizedString(region.getFullPath()));
}
return new CacheStatisticsImpl(this.regionEntry, region);
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof EntrySnapshot)) {
return false;
}
EntrySnapshot ent = (EntrySnapshot) obj;
return this.regionEntry.getKey().equals(ent.getKey());
}
@Override
public int hashCode() {
return this.regionEntry.getKey().hashCode();
}
public Object setValue(Object arg) {
Object returnValue = region.put(this.getKey(), arg);
this.regionEntry.setCachedValue(arg);
return returnValue;
}
/*
* (non-Javadoc)
*
* @see org.apache.geode.cache.Region.Entry#isLocal()
*/
public boolean isLocal() {
// pr entries are always non-local to support the bucket being moved out
// from under an entry
return false;
}
@Override
public String toString() {
if (this.isDestroyed()) {
return "EntrySnapshot(#destroyed#" + regionEntry.getKey() + "; version="
+ this.getVersionTag() + ")";
} else {
return "EntrySnapshot(" + this.regionEntry + ")";
}
}
/**
* get the underlying RegionEntry object, which will not be fully functional if isLocal() returns
* false
*
* @return the underlying RegionEntry for this Entry
*/
public RegionEntry getRegionEntry() {
return this.regionEntry;
}
// ////////////////////////////////////
// /////////////////////// P R I V A T E M E T H O D S
// ////////////////////////////////////
private void checkEntryDestroyed() throws EntryDestroyedException {
if (isDestroyed()) {
throw new EntryDestroyedException(
LocalizedStrings.PartitionedRegion_ENTRY_DESTROYED.toLocalizedString());
}
}
// for deserialization
public EntrySnapshot() {}
public EntrySnapshot(DataInput in, LocalRegion region)
throws IOException, ClassNotFoundException {
this.fromData(in);
this.region = region;
}
public void setRegion(LocalRegion r) {
this.region = r;
}
public void setRegionEntry(NonLocalRegionEntry re) {
this.regionEntry = re;
}
// when externalized, we write the state of a non-local RegionEntry so it
// can
// be reconstituted anywhere
public void toData(DataOutput out) throws IOException {
out.writeBoolean(this.regionEntry instanceof NonLocalRegionEntryWithStats);
this.regionEntry.toData(out);
}
public void fromData(DataInput in) throws IOException, ClassNotFoundException {
this.startedLocal = false;
boolean hasStats = in.readBoolean();
if (hasStats) {
this.regionEntry = new NonLocalRegionEntryWithStats();
} else {
this.regionEntry = new NonLocalRegionEntry();
}
this.regionEntry.fromData(in);
}
}