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Oracle Coherence Community Edition
/*
* Copyright (c) 2000, 2023, Oracle and/or its affiliates.
*
* Licensed under the Universal Permissive License v 1.0 as shown at
* https://oss.oracle.com/licenses/upl.
*/
package com.oracle.coherence.client;
import com.tangosol.coherence.component.net.memberSet.actualMemberSet.ServiceMemberSet;
import com.tangosol.internal.net.NamedCacheDeactivationListener;
import com.tangosol.internal.net.grpc.RemoteGrpcCacheServiceDependencies;
import com.tangosol.net.BackingMapManager;
import com.tangosol.net.CacheFactory;
import com.tangosol.net.CacheService;
import com.tangosol.net.Coherence;
import com.tangosol.net.NamedCache;
import com.tangosol.net.RequestTimeoutException;
import com.tangosol.net.events.EventDispatcherRegistry;
import com.tangosol.util.AbstractMapListener;
import com.tangosol.util.IteratorEnumerator;
import com.tangosol.util.MapEvent;
import com.tangosol.util.ResourceRegistry;
import io.grpc.Channel;
import io.grpc.ClientInterceptors;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.function.IntPredicate;
/**
* A remote cache service that accesses caches via a remote gRPC proxy.
*
* @author Jonathan Knight 2022.08.25
* @since 22.06.2
*/
@SuppressWarnings("rawtypes")
public class GrpcRemoteCacheService
extends GrpcRemoteService
implements CacheService
{
public GrpcRemoteCacheService()
{
super(CacheService.TYPE_REMOTE_GRPC);
}
@Override
public BackingMapManager getBackingMapManager()
{
return m_backingMapManager;
}
@Override
public void setBackingMapManager(BackingMapManager manager)
{
m_backingMapManager = manager;
}
@Override
public NamedCache ensureCache(String sName, ClassLoader ignored)
{
ClassLoader loader = getContextClassLoader();
if (loader == null)
{
throw new IllegalStateException("ContextClassLoader is missing");
}
AsyncNamedCacheClient cache = m_scopedCacheStore.get(sName, loader);
if (cache == null || !cache.isActiveInternal())
{
// this is one of the few places that acquiring a distinct lock per cache
// is beneficial due to the potential cost of createRemoteNamedCache
long cWait = getDependencies().getRequestTimeoutMillis();
if (cWait <= 0)
{
cWait = -1;
}
if (!m_scopedCacheStore.lock(sName, cWait))
{
throw new RequestTimeoutException("Failed to get a reference to cache '" +
sName + "' after " + cWait + "ms");
}
try
{
cache = (AsyncNamedCacheClient) m_scopedCacheStore.get(sName, loader);
if (cache == null || !cache.isActiveInternal())
{
cache = ensureAsyncCache(sName);
m_scopedCacheStore.put(cache, loader);
}
}
finally
{
m_scopedCacheStore.unlock(sName);
}
}
return cache.getNamedCache();
}
@Override
public Enumeration getCacheNames()
{
// instead of synchronizing on the Map and blocking all
// the "put" and "remove" operations, we just catch any
// ConcurrentModificationException and try again
return new IteratorEnumerator(Arrays.asList(m_scopedCacheStore.getNames().toArray()).iterator());
}
@Override
public void releaseCache(NamedCache map)
{
if (!(map instanceof NamedCacheClient))
{
throw new IllegalArgumentException("illegal map: " + map);
}
map.release();
NamedCacheClient cache = (NamedCacheClient) map;
m_scopedCacheStore.release(cache.getAsyncClient());
}
@Override
public void destroyCache(NamedCache map)
{
if (!(map instanceof NamedCacheClient))
{
throw new IllegalArgumentException("illegal map: " + map);
}
map.destroy();
NamedCacheClient cache = (NamedCacheClient) map;
m_scopedCacheStore.release(cache.getAsyncClient());
}
@Override
public boolean isVersionCompatible(int nMajor, int nMinor, int nMicro, int nPatchSet, int nPatch)
{
int nEncoded = ServiceMemberSet.encodeVersion(nMajor, nMinor, nMicro, nPatchSet, nPatch);
return CacheFactory.VERSION_ENCODED >= nEncoded;
}
@Override
public boolean isVersionCompatible(int nYear, int nMonth, int nPatch)
{
int nEncoded = ServiceMemberSet.encodeVersion(nYear, nMonth, nPatch);
return CacheFactory.VERSION_ENCODED >= nEncoded;
}
@Override
public boolean isVersionCompatible(int nVersion)
{
return CacheFactory.VERSION_ENCODED >= nVersion;
}
@Override
public boolean isVersionCompatible(IntPredicate predicate)
{
return predicate.test(CacheFactory.VERSION_ENCODED);
}
@Override
public int getMinimumServiceVersion()
{
return CacheFactory.VERSION_ENCODED;
}
// ----- helper methods -------------------------------------------------
@Override
@SuppressWarnings("unchecked")
protected void stopInternal()
{
for (AsyncNamedCacheClient cache : m_scopedCacheStore.getAll())
{
cache.removeDeactivationListener(f_deactivationListener);
try
{
cache.release();
}
catch (Throwable e)
{
e.printStackTrace();
}
}
}
@Override
protected EventDispatcherRegistry getDefaultEventDispatcherRegistry()
{
ResourceRegistry registry = getBackingMapManager().getCacheFactory().getResourceRegistry();
return registry.getResource(EventDispatcherRegistry.class);
}
/**
* Creates a {@link AsyncNamedCacheClient} based on the provided arguments.
*
* @param sCacheName the cache name
* @param the key type
* @param the value type
*
* @return a new {@link AsyncNamedCacheClient}
*/
@SuppressWarnings("unchecked")
protected AsyncNamedCacheClient ensureAsyncCache(String sCacheName)
{
Channel channel = m_tracingInterceptor == null
? m_channel
: ClientInterceptors.intercept(m_channel, m_tracingInterceptor);
RemoteGrpcCacheServiceDependencies dependencies = getDependencies();
String sScopeName = dependencies.getRemoteScopeName();
GrpcCacheLifecycleEventDispatcher dispatcher = new GrpcCacheLifecycleEventDispatcher(sCacheName, this);
if (sScopeName == null)
{
sScopeName = Coherence.DEFAULT_SCOPE;
}
AsyncNamedCacheClient.DefaultDependencies deps
= new AsyncNamedCacheClient.DefaultDependencies(sCacheName, channel, dispatcher);
deps.setScope(sScopeName);
deps.setSerializer(m_serializer, m_serializer.getName());
deps.setExecutor(m_executor);
deps.setDeadline(dependencies.getDeadline());
AsyncNamedCacheClient client = new AsyncNamedCacheClient<>(deps);
EventDispatcherRegistry dispatcherReg = getEventDispatcherRegistry();
if (dispatcherReg != null)
{
dispatcherReg.registerEventDispatcher(dispatcher);
}
client.setCacheService(this);
client.addDeactivationListener(f_truncateListener);
client.addDeactivationListener(f_deactivationListener);
// We must dispatch the created event async
m_executor.execute(() -> dispatcher.dispatchCacheCreated(client.getNamedCache()));
return (AsyncNamedCacheClient) client;
}
// ----- inner class: ClientDeactivationListener ------------------------
/**
* A {@link DeactivationListener} that cleans up the internal caches map
* as clients are released or destroyed.
*/
private class ClientDeactivationListener
implements DeactivationListener>
{
// ----- DeactivationListener interface -----------------------------
@Override
public void released(AsyncNamedCacheClient client)
{
GrpcRemoteCacheService.this.m_scopedCacheStore.remove(client.getCacheName());
}
@Override
public void destroyed(AsyncNamedCacheClient client)
{
GrpcRemoteCacheService service = GrpcRemoteCacheService.this;
boolean removed = service.m_scopedCacheStore.release(client);
if (removed)
{
GrpcCacheLifecycleEventDispatcher dispatcher = client.getEventDispatcher();
EventDispatcherRegistry dispatcherReg = service.getEventDispatcherRegistry();
dispatcher.dispatchCacheDestroyed(client.getNamedCache());
dispatcherReg.unregisterEventDispatcher(client.getEventDispatcher());
}
}
}
// ----- inner class: TruncateListener ----------------------------------
/**
* A {@link DeactivationListener} that cleans up the internal caches map
* as clients are released or destroyed.
*/
@SuppressWarnings("rawtypes")
private class TruncateListener
extends AbstractMapListener
implements NamedCacheDeactivationListener
{
// ----- NamedCacheDeactivationListener interface -------------------
@Override
public void entryUpdated(MapEvent evt)
{
NamedCache cache = (NamedCache) evt.getMap();
AsyncNamedCacheClient client = m_scopedCacheStore.get(cache.getCacheName(), getContextClassLoader());
if (client != null)
{
client.getEventDispatcher().dispatchCacheTruncated((NamedCache) evt.getMap());
}
}
}
// ----- data members ---------------------------------------------------
/**
* The {@link DeactivationListener} that will clean up client instances that
* are destroyed or released.
*/
@SuppressWarnings("rawtypes")
private final ClientDeactivationListener f_deactivationListener = new ClientDeactivationListener<>();
/**
* The {@link TruncateListener} that will raise lifecycle events when
* a map is truncated.
*/
private final TruncateListener f_truncateListener = new TruncateListener();
private BackingMapManager m_backingMapManager;
/**
* The store of cache references, optionally scoped by Subject.
*/
private final ScopedGrpcAsyncCacheReferenceStore m_scopedCacheStore = new ScopedGrpcAsyncCacheReferenceStore();
}