org.apache.jackrabbit.oak.segment.SegmentNodeStoreService Maven / Gradle / Ivy
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* 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.jackrabbit.oak.segment;
import static com.google.common.base.Preconditions.checkState;
import static java.util.Collections.emptyMap;
import static org.apache.jackrabbit.oak.commons.PropertiesUtil.toBoolean;
import static org.apache.jackrabbit.oak.commons.PropertiesUtil.toInteger;
import static org.apache.jackrabbit.oak.commons.PropertiesUtil.toLong;
import static org.apache.jackrabbit.oak.osgi.OsgiUtil.lookupConfigurationThenFramework;
import static org.apache.jackrabbit.oak.segment.compaction.SegmentGCOptions.FORCE_AFTER_FAIL_DEFAULT;
import static org.apache.jackrabbit.oak.segment.compaction.SegmentGCOptions.GAIN_THRESHOLD_DEFAULT;
import static org.apache.jackrabbit.oak.segment.compaction.SegmentGCOptions.MEMORY_THRESHOLD_DEFAULT;
import static org.apache.jackrabbit.oak.segment.compaction.SegmentGCOptions.PAUSE_DEFAULT;
import static org.apache.jackrabbit.oak.segment.compaction.SegmentGCOptions.RETRY_COUNT_DEFAULT;
import static org.apache.jackrabbit.oak.segment.file.FileStoreBuilder.fileStoreBuilder;
import static org.apache.jackrabbit.oak.spi.blob.osgi.SplitBlobStoreService.ONLY_STANDALONE_TARGET;
import static org.apache.jackrabbit.oak.spi.whiteboard.WhiteboardUtils.registerMBean;
import static org.apache.jackrabbit.oak.spi.whiteboard.WhiteboardUtils.scheduleWithFixedDelay;
import java.io.ByteArrayInputStream;
import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Dictionary;
import java.util.Hashtable;
import java.util.List;
import java.util.concurrent.TimeUnit;
import org.apache.felix.scr.annotations.Activate;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.ConfigurationPolicy;
import org.apache.felix.scr.annotations.Deactivate;
import org.apache.felix.scr.annotations.Property;
import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.ReferenceCardinality;
import org.apache.felix.scr.annotations.ReferencePolicy;
import org.apache.jackrabbit.commons.SimpleValueFactory;
import org.apache.jackrabbit.oak.api.Descriptors;
import org.apache.jackrabbit.oak.api.jmx.CacheStatsMBean;
import org.apache.jackrabbit.oak.api.jmx.CheckpointMBean;
import org.apache.jackrabbit.oak.cache.CacheStats;
import org.apache.jackrabbit.oak.osgi.ObserverTracker;
import org.apache.jackrabbit.oak.osgi.OsgiWhiteboard;
import org.apache.jackrabbit.oak.plugins.blob.BlobGC;
import org.apache.jackrabbit.oak.plugins.blob.BlobGCMBean;
import org.apache.jackrabbit.oak.plugins.blob.BlobGarbageCollector;
import org.apache.jackrabbit.oak.plugins.blob.MarkSweepGarbageCollector;
import org.apache.jackrabbit.oak.plugins.blob.SharedDataStore;
import org.apache.jackrabbit.oak.plugins.blob.datastore.SharedDataStoreUtils;
import org.apache.jackrabbit.oak.plugins.blob.datastore.SharedDataStoreUtils.SharedStoreRecordType;
import org.apache.jackrabbit.oak.plugins.identifier.ClusterRepositoryInfo;
import org.apache.jackrabbit.oak.segment.compaction.SegmentGCOptions;
import org.apache.jackrabbit.oak.segment.compaction.SegmentRevisionGC;
import org.apache.jackrabbit.oak.segment.compaction.SegmentRevisionGCMBean;
import org.apache.jackrabbit.oak.segment.file.FileStore;
import org.apache.jackrabbit.oak.segment.file.FileStoreBuilder;
import org.apache.jackrabbit.oak.segment.file.FileStoreGCMonitor;
import org.apache.jackrabbit.oak.segment.file.FileStoreStatsMBean;
import org.apache.jackrabbit.oak.segment.file.GCMonitorMBean;
import org.apache.jackrabbit.oak.spi.blob.BlobStore;
import org.apache.jackrabbit.oak.spi.blob.GarbageCollectableBlobStore;
import org.apache.jackrabbit.oak.spi.commit.Observable;
import org.apache.jackrabbit.oak.spi.commit.Observer;
import org.apache.jackrabbit.oak.spi.gc.GCMonitor;
import org.apache.jackrabbit.oak.spi.gc.GCMonitorTracker;
import org.apache.jackrabbit.oak.spi.state.NodeStore;
import org.apache.jackrabbit.oak.spi.state.ProxyNodeStore;
import org.apache.jackrabbit.oak.spi.state.RevisionGC;
import org.apache.jackrabbit.oak.spi.state.RevisionGCMBean;
import org.apache.jackrabbit.oak.spi.whiteboard.CompositeRegistration;
import org.apache.jackrabbit.oak.spi.whiteboard.Registration;
import org.apache.jackrabbit.oak.spi.whiteboard.WhiteboardExecutor;
import org.apache.jackrabbit.oak.stats.Clock;
import org.apache.jackrabbit.oak.stats.StatisticsProvider;
import org.apache.jackrabbit.oak.util.GenericDescriptors;
import org.osgi.framework.Constants;
import org.osgi.framework.ServiceRegistration;
import org.osgi.service.component.ComponentContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* An OSGi wrapper for the segment node store.
*/
@Component(policy = ConfigurationPolicy.REQUIRE,
metatype = true,
label = "Apache Jackrabbit Oak Segment NodeStore Service",
description = "NodeStore implementation based on Segment model. For configuration option refer " +
"to http://jackrabbit.apache.org/oak/docs/osgi_config.html#SegmentNodeStore. Note that for system " +
"stability purpose it is advisable to not change these settings at runtime. Instead the config change " +
"should be done via file system based config file and this view should ONLY be used to determine which " +
"options are supported"
)
public class SegmentNodeStoreService extends ProxyNodeStore
implements Observable, SegmentStoreProvider {
public static final String NAME = "name";
@Property(
label = "Directory",
description="Directory location used to store the segment tar files. If not specified then looks " +
"for framework property 'repository.home' otherwise use a subdirectory with name 'tarmk'"
)
public static final String DIRECTORY = "repository.home";
@Property(
label = "Mode",
description="TarMK mode (64 for memory mapping, 32 for normal file access)"
)
public static final String MODE = "tarmk.mode";
@Property(
intValue = 256,
label = "Maximum Tar File Size (MB)",
description = "TarMK maximum file size (MB)"
)
public static final String SIZE = "tarmk.size";
@Property(
intValue = 256,
label = "Segment cache size (MB)",
description = "Cache size for storing most recently used segments"
)
public static final String SEGMENT_CACHE_SIZE = "segmentCache.size";
@Property(
intValue = 256,
label = "String cache size (MB)",
description = "Cache size for storing most recently used strings"
)
public static final String STRING_CACHE_SIZE = "stringCache.size";
@Property(
intValue = 64,
label = "Template cache size (MB)",
description = "Cache size for storing most recently used templates"
)
public static final String TEMPLATE_CACHE_SIZE = "templateCache.size";
@Property(
intValue = 15000,
label = "String deduplication cache size (#items)",
description = "Maximum number of strings to keep in the deduplication cache"
)
public static final String STRING_DEDUPLICATION_CACHE_SIZE = "stringDeduplicationCache.size";
@Property(
intValue = 3000,
label = "Template deduplication cache size (#items)",
description = "Maximum number of templates to keep in the deduplication cache"
)
public static final String TEMPLATE_DEDUPLICATION_CACHE_SIZE = "templateDeduplicationCache.size";
@Property(
intValue = 10000000,
label = "Node deduplication cache size (#items)",
description = "Maximum number of nodes to keep in the deduplication cache"
)
public static final String NODE_DEDUPLICATION_CACHE_SIZE = "nodeDeduplicationCache.size";
@Property(
intValue = 20,
label = "Node deduplication cache depth (#levels)",
description = "Maximum number of levels to keep in the node deduplication cache"
)
public static final String NODE_DEDUPLICATION_CACHE_DEPTH = "nodeDeduplicationCache.depth";
@Property(
byteValue = MEMORY_THRESHOLD_DEFAULT,
label = "Memory Multiplier",
description = "TarMK compaction available memory multiplier needed to run compaction"
)
public static final String COMPACTION_MEMORY_THRESHOLD = "compaction.memoryThreshold";
@Property(
byteValue = GAIN_THRESHOLD_DEFAULT,
label = "Compaction gain threshold",
description = "TarMK compaction gain threshold. The gain estimation prevents compaction from running " +
"if the provided threshold is not met. Value represents a percentage so an input between 0 and 100 is expected."
)
public static final String COMPACTION_GAIN_THRESHOLD = "compaction.gainThreshold";
@Property(
boolValue = PAUSE_DEFAULT,
label = "Pause Compaction",
description = "When enabled compaction would not be performed"
)
public static final String PAUSE_COMPACTION = "pauseCompaction";
@Property(
intValue = RETRY_COUNT_DEFAULT,
label = "Compaction Retries",
description = "Number of tries to compact concurrent commits on top of already " +
"compacted commits"
)
public static final String COMPACTION_RETRY_COUNT = "compaction.retryCount";
@Property(
boolValue = FORCE_AFTER_FAIL_DEFAULT,
label = "Force Compaction",
description = "Whether or not to force compact concurrent commits on top of already " +
" compacted commits after the maximum number of retries has been reached. " +
"Force committing tries to exclusively write lock the node store."
)
public static final String COMPACTION_FORCE_AFTER_FAIL = "compaction.forceAfterFail";
public static final int COMPACTION_LOCK_WAIT_TIME_DEFAULT = 60;
@Property(
intValue = COMPACTION_LOCK_WAIT_TIME_DEFAULT,
label = "Compaction Lock Wait Time",
description = "Number of seconds to wait for the lock for committing compacted changes " +
"respectively to wait for the exclusive write lock for force committing."
)
public static final String COMPACTION_LOCK_WAIT_TIME = "compaction.lockWaitTime";
@Property(
boolValue = false,
label = "Standby Mode",
description = "Flag indicating that this component will not register as a NodeStore but just as a NodeStoreProvider"
)
public static final String STANDBY = "standby";
@Property(boolValue = false,
label = "Custom BlobStore",
description = "Boolean value indicating that a custom BlobStore is to be used. " +
"By default large binary content would be stored within segment tar files"
)
public static final String CUSTOM_BLOB_STORE = "customBlobStore";
private final Logger log = LoggerFactory.getLogger(getClass());
private String name;
private FileStore store;
private volatile SegmentNodeStore segmentNodeStore;
private ObserverTracker observerTracker;
private GCMonitorTracker gcMonitor;
private ComponentContext context;
@Reference(cardinality = ReferenceCardinality.OPTIONAL_UNARY,
policy = ReferencePolicy.DYNAMIC, target = ONLY_STANDALONE_TARGET)
private volatile BlobStore blobStore;
@Reference
private StatisticsProvider statisticsProvider = StatisticsProvider.NOOP;
private ServiceRegistration storeRegistration;
private ServiceRegistration providerRegistration;
private final List registrations = new ArrayList<>();
private WhiteboardExecutor executor;
private boolean customBlobStore;
/**
* Blob modified before this time duration would be considered for Blob GC
*/
private static final long DEFAULT_BLOB_GC_MAX_AGE = 24 * 60 * 60;
@Property (longValue = DEFAULT_BLOB_GC_MAX_AGE,
label = "Blob GC Max Age (in secs)",
description = "Blob Garbage Collector (GC) logic will only consider those blobs for GC which " +
"are not accessed recently (currentTime - lastModifiedTime > blobGcMaxAgeInSecs). For " +
"example as per default only those blobs which have been created 24 hrs ago will be " +
"considered for GC"
)
public static final String PROP_BLOB_GC_MAX_AGE = "blobGcMaxAgeInSecs";
@Override
protected SegmentNodeStore getNodeStore() {
checkState(segmentNodeStore != null, "service must be activated when used");
return segmentNodeStore;
}
@Activate
public void activate(ComponentContext context) throws IOException {
this.context = context;
this.customBlobStore = Boolean.parseBoolean(property(CUSTOM_BLOB_STORE));
if (blobStore == null && customBlobStore) {
log.info("BlobStore use enabled. SegmentNodeStore would be initialized when BlobStore would be available");
} else {
registerNodeStore();
}
}
protected void bindBlobStore(BlobStore blobStore) throws IOException {
this.blobStore = blobStore;
registerNodeStore();
}
protected void unbindBlobStore(BlobStore blobStore){
this.blobStore = null;
unregisterNodeStore();
}
@Deactivate
public void deactivate() {
unregisterNodeStore();
synchronized (this) {
if (observerTracker != null) {
observerTracker.stop();
}
if (gcMonitor != null) {
gcMonitor.stop();
}
segmentNodeStore = null;
if (store != null) {
store.close();
store = null;
}
}
}
private synchronized void registerNodeStore() throws IOException {
if (registerSegmentStore()) {
if (toBoolean(property(STANDBY), false)) {
return;
}
if (registerSegmentNodeStore()) {
Dictionary props = new Hashtable();
props.put(Constants.SERVICE_PID, SegmentNodeStore.class.getName());
props.put("oak.nodestore.description", new String[]{"nodeStoreType=segment"});
storeRegistration = context.getBundleContext().registerService(NodeStore.class.getName(), this, props);
}
}
}
private boolean registerSegmentStore() throws IOException {
if (context == null) {
log.info("Component still not activated. Ignoring the initialization call");
return false;
}
OsgiWhiteboard whiteboard = new OsgiWhiteboard(context.getBundleContext());
// Listen for GCMonitor services
gcMonitor = new GCMonitorTracker();
gcMonitor.start(whiteboard);
// Create the gc options
SegmentGCOptions gcOptions = newGCOptions();
// Build the FileStore
FileStoreBuilder builder = fileStoreBuilder(getDirectory())
.withSegmentCacheSize(getSegmentCacheSize())
.withStringCacheSize(getStringCacheSize())
.withTemplateCacheSize(getTemplateCacheSize())
.withStringDeduplicationCacheSize(getStringDeduplicationCacheSize())
.withTemplateDeduplicationCacheSize(getTemplateDeduplicationCacheSize())
.withNodeDeduplicationCacheSize(getNodeDeduplicationCacheSize())
.withNodeDeduplicationDepth(getNodeDeduplicationDepth())
.withMaxFileSize(getMaxFileSize())
.withMemoryMapping(getMode().equals("64"))
.withGCMonitor(gcMonitor)
.withStatisticsProvider(statisticsProvider)
.withGCOptions(gcOptions);
if (customBlobStore) {
log.info("Initializing SegmentNodeStore with BlobStore [{}]", blobStore);
builder.withBlobStore(blobStore);
}
store = builder.build();
// Expose an MBean to provide information about the gc options
registrations.add(registerMBean(
whiteboard,
SegmentRevisionGC.class,
new SegmentRevisionGCMBean(gcOptions),
SegmentRevisionGC.TYPE,
"Segment node store gc options"
));
// Expose stats about the segment cache
CacheStatsMBean segmentCacheStats = store.getSegmentCacheStats();
registrations.add(registerMBean(
whiteboard,
CacheStatsMBean.class,
segmentCacheStats,
CacheStats.TYPE,
segmentCacheStats.getName()
));
// Expose stats about the string and template caches
CacheStatsMBean stringCacheStats = store.getStringCacheStats();
registrations.add(registerMBean(
whiteboard,
CacheStatsMBean.class,
stringCacheStats,CacheStats.TYPE,
stringCacheStats.getName()
));
CacheStatsMBean templateCacheStats = store.getTemplateCacheStats();
registrations.add(registerMBean(
whiteboard,
CacheStatsMBean.class,
templateCacheStats,CacheStats.TYPE,
templateCacheStats.getName()
));
CacheStatsMBean stringDeduplicationCacheStats = store.getStringDeduplicationCacheStats();
if (stringDeduplicationCacheStats != null) {
registrations.add(registerMBean(
whiteboard,
CacheStatsMBean.class,
stringDeduplicationCacheStats,CacheStats.TYPE,
stringDeduplicationCacheStats.getName()));
}
CacheStatsMBean templateDeduplicationCacheStats = store.getTemplateDeduplicationCacheStats();
if (templateDeduplicationCacheStats != null) {
registrations.add(registerMBean(
whiteboard,
CacheStatsMBean.class,
templateDeduplicationCacheStats,CacheStats.TYPE,
templateDeduplicationCacheStats.getName()));
}
CacheStatsMBean nodeDeduplicationCacheStats = store.getNodeDeduplicationCacheStats();
if (nodeDeduplicationCacheStats != null) {
registrations.add(registerMBean(
whiteboard,
CacheStatsMBean.class,
nodeDeduplicationCacheStats,CacheStats.TYPE,
nodeDeduplicationCacheStats.getName()));
}
// Listen for Executor services on the whiteboard
executor = new WhiteboardExecutor();
executor.start(whiteboard);
// Expose an MBean to trigger garbage collection
Runnable triggerGarbageCollection = new Runnable() {
@Override
public void run() {
store.gc();
}
};
registrations.add(registerMBean(
whiteboard,
RevisionGCMBean.class,
new RevisionGC(triggerGarbageCollection, executor),
RevisionGCMBean.TYPE,
"Segment node store revision garbage collection"
));
// Expose statistics about the FileStore
registrations.add(registerMBean(
whiteboard,
FileStoreStatsMBean.class,
store.getStats(),
FileStoreStatsMBean.TYPE,
"FileStore statistics"
));
// Register a monitor for the garbage collection of the FileStore
FileStoreGCMonitor fsgcm = new FileStoreGCMonitor(Clock.SIMPLE);
registrations.add((new CompositeRegistration(
whiteboard.register(GCMonitor.class, fsgcm, emptyMap()),
registerMBean(
whiteboard,
GCMonitorMBean.class,
fsgcm,
GCMonitorMBean.TYPE,
"File Store garbage collection monitor"
),
scheduleWithFixedDelay(whiteboard, fsgcm, 1)
)));
// Register a factory service to expose the FileStore
providerRegistration = context.getBundleContext().registerService(SegmentStoreProvider.class.getName(), this, null);
return true;
}
private SegmentGCOptions newGCOptions() {
boolean pauseCompaction = toBoolean(property(PAUSE_COMPACTION), PAUSE_DEFAULT);
int retryCount = toInteger(property(COMPACTION_RETRY_COUNT), RETRY_COUNT_DEFAULT);
boolean forceAfterFail = toBoolean(property(COMPACTION_FORCE_AFTER_FAIL), FORCE_AFTER_FAIL_DEFAULT);
final int lockWaitTime = toInteger(property(COMPACTION_LOCK_WAIT_TIME), COMPACTION_LOCK_WAIT_TIME_DEFAULT);
byte memoryThreshold = getMemoryThreshold();
byte gainThreshold = getGainThreshold();
SegmentGCOptions segmentGCOptions = new SegmentGCOptions(
pauseCompaction, memoryThreshold, gainThreshold, retryCount, forceAfterFail, lockWaitTime);
segmentGCOptions.setForceAfterFail(forceAfterFail);
return segmentGCOptions;
}
private boolean registerSegmentNodeStore() throws IOException {
Dictionary properties = context.getProperties();
name = String.valueOf(properties.get(NAME));
final long blobGcMaxAgeInSecs = toLong(property(PROP_BLOB_GC_MAX_AGE), DEFAULT_BLOB_GC_MAX_AGE);
OsgiWhiteboard whiteboard = new OsgiWhiteboard(context.getBundleContext());
segmentNodeStore = SegmentNodeStoreBuilders.builder(store).build();
observerTracker = new ObserverTracker(segmentNodeStore);
observerTracker.start(context.getBundleContext());
registrations.add(registerMBean(whiteboard, CheckpointMBean.class, new SegmentCheckpointMBean(segmentNodeStore),
CheckpointMBean.TYPE, "Segment node store checkpoint management"));
// ensure a clusterId is initialized
// and expose it as 'oak.clusterid' repository descriptor
GenericDescriptors clusterIdDesc = new GenericDescriptors();
clusterIdDesc.put(ClusterRepositoryInfo.OAK_CLUSTERID_REPOSITORY_DESCRIPTOR_KEY,
new SimpleValueFactory().createValue(
ClusterRepositoryInfo.getOrCreateId(segmentNodeStore)), true, false);
registrations.add(whiteboard.register(
Descriptors.class,
clusterIdDesc,
Collections.emptyMap()
));
// Register "discovery lite" descriptors
registrations.add(whiteboard.register(
Descriptors.class,
new SegmentDiscoveryLiteDescriptors(segmentNodeStore),
Collections.emptyMap()
));
// If a shared data store register the repo id in the data store
String repoId = "";
if (SharedDataStoreUtils.isShared(blobStore)) {
try {
repoId = ClusterRepositoryInfo.getOrCreateId(segmentNodeStore);
((SharedDataStore) blobStore).addMetadataRecord(new ByteArrayInputStream(new byte[0]),
SharedStoreRecordType.REPOSITORY.getNameFromId(repoId));
} catch (Exception e) {
throw new IOException("Could not register a unique repositoryId", e);
}
}
if (store.getBlobStore() instanceof GarbageCollectableBlobStore) {
BlobGarbageCollector gc = new MarkSweepGarbageCollector(
new SegmentBlobReferenceRetriever(store),
(GarbageCollectableBlobStore) store.getBlobStore(),
executor,
TimeUnit.SECONDS.toMillis(blobGcMaxAgeInSecs),
repoId
);
registrations.add(registerMBean(
whiteboard,
BlobGCMBean.class,
new BlobGC(gc, executor),
BlobGCMBean.TYPE,
"Segment node store blob garbage collection"
));
}
log.info("SegmentNodeStore initialized");
return true;
}
private void unregisterNodeStore() {
new CompositeRegistration(registrations).unregister();
if (providerRegistration != null) {
providerRegistration.unregister();
providerRegistration = null;
}
if (storeRegistration != null) {
storeRegistration.unregister();
storeRegistration = null;
}
if (executor != null) {
executor.stop();
executor = null;
}
}
private File getBaseDirectory() {
String directory = property(DIRECTORY);
if (directory != null) {
return new File(directory);
}
return new File("tarmk");
}
private File getDirectory() {
return new File(getBaseDirectory(), "segmentstore");
}
private String getMode() {
String mode = property(MODE);
if (mode != null) {
return mode;
}
return System.getProperty(MODE, System.getProperty("sun.arch.data.model", "32"));
}
private String getCacheSize(String propertyName) {
String cacheSize = property(propertyName);
if (cacheSize != null) {
return cacheSize;
}
return System.getProperty(propertyName);
}
private int getSegmentCacheSize() {
return Integer.parseInt(getCacheSize(SEGMENT_CACHE_SIZE));
}
private int getStringCacheSize() {
return Integer.parseInt(getCacheSize(STRING_CACHE_SIZE));
}
private int getTemplateCacheSize() {
return Integer.parseInt(getCacheSize(TEMPLATE_CACHE_SIZE));
}
private int getStringDeduplicationCacheSize() {
return Integer.parseInt(getCacheSize(STRING_DEDUPLICATION_CACHE_SIZE));
}
private int getTemplateDeduplicationCacheSize() {
return Integer.parseInt(getCacheSize(TEMPLATE_DEDUPLICATION_CACHE_SIZE));
}
private int getNodeDeduplicationCacheSize() {
return Integer.parseInt(getCacheSize(NODE_DEDUPLICATION_CACHE_SIZE));
}
private int getNodeDeduplicationDepth() {
return Integer.parseInt(getCacheSize(NODE_DEDUPLICATION_CACHE_DEPTH));
}
private String getMaxFileSizeProperty() {
String size = property(SIZE);
if (size != null) {
return size;
}
return System.getProperty(SIZE, "256");
}
private int getMaxFileSize() {
return Integer.parseInt(getMaxFileSizeProperty());
}
private byte getMemoryThreshold() {
String mt = property(COMPACTION_MEMORY_THRESHOLD);
if (mt == null) {
return MEMORY_THRESHOLD_DEFAULT;
}
return Byte.valueOf(mt);
}
private byte getGainThreshold() {
String gt = property(COMPACTION_GAIN_THRESHOLD);
if (gt == null) {
return GAIN_THRESHOLD_DEFAULT;
}
return Byte.valueOf(gt);
}
private String property(String name) {
return lookupConfigurationThenFramework(context, name);
}
/**
* needed for situations where you have to unwrap the
* SegmentNodeStoreService, to get the SegmentStore, like the failover
*/
@Override
public SegmentStore getSegmentStore() {
return store;
}
//------------------------------------------------------------< Observable >---
@Override
public Closeable addObserver(Observer observer) {
return getNodeStore().addObserver(observer);
}
//------------------------------------------------------------< Object >--
@Override
public String toString() {
return name + ": " + segmentNodeStore;
}
}
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