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package com.salesforce.phoenix.cache;
import java.io.Closeable;
import java.sql.SQLException;
import java.util.Collections;
import java.util.concurrent.TimeUnit;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import com.google.common.cache.*;
import com.salesforce.hbase.index.util.ImmutableBytesPtr;
import com.salesforce.phoenix.coprocessor.ServerCachingProtocol.ServerCacheFactory;
import com.salesforce.phoenix.memory.MemoryManager;
import com.salesforce.phoenix.memory.MemoryManager.MemoryChunk;
import com.salesforce.phoenix.util.Closeables;
/**
*
* Cache per tenant on server side. Tracks memory usage for each
* tenat as well and rolling up usage to global memory manager.
*
* @author jtaylor
* @since 0.1
*/
public class TenantCacheImpl implements TenantCache {
private final int maxTimeToLiveMs;
private final MemoryManager memoryManager;
private volatile Cache<ImmutableBytesPtr, Closeable> serverCaches;
public TenantCacheImpl(MemoryManager memoryManager, int maxTimeToLiveMs) {
this.memoryManager = memoryManager;
this.maxTimeToLiveMs = maxTimeToLiveMs;
}
@Override
public MemoryManager getMemoryManager() {
return memoryManager;
}
private Cache<ImmutableBytesPtr,Closeable> getServerCaches() {
/* Delay creation of this map until it's needed */
if (serverCaches == null) {
synchronized(this) {
if (serverCaches == null) {
serverCaches = CacheBuilder.newBuilder()
.expireAfterAccess(maxTimeToLiveMs, TimeUnit.MILLISECONDS)
.removalListener(new RemovalListener<ImmutableBytesPtr, Closeable>(){
@Override
public void onRemoval(RemovalNotification<ImmutableBytesPtr, Closeable> notification) {
Closeables.closeAllQuietly(Collections.singletonList(notification.getValue()));
}
})
.build();
}
}
}
return serverCaches;
}
@Override
public Closeable getServerCache(ImmutableBytesPtr cacheId) {
return getServerCaches().getIfPresent(cacheId);
}
@Override
public Closeable addServerCache(ImmutableBytesPtr cacheId, ImmutableBytesWritable cachePtr, ServerCacheFactory cacheFactory) throws SQLException {
MemoryChunk chunk = this.getMemoryManager().allocate(cachePtr.getLength());
Closeable element = cacheFactory.newCache(cachePtr, chunk);
getServerCaches().put(cacheId, element);
return element;
}
@Override
public void removeServerCache(ImmutableBytesPtr cacheId) throws SQLException {
getServerCaches().invalidate(cacheId);
}
}