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/*
* 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.google.protobuf.ByteString;
import com.google.protobuf.BytesValue;
import com.google.protobuf.UnsafeByteOperations;
import com.oracle.coherence.common.base.Classes;
import com.oracle.coherence.grpc.BinaryHelper;
import com.oracle.coherence.grpc.OptionalValue;
import com.oracle.coherence.grpc.SimpleDaemonPoolExecutor;
import com.tangosol.coherence.config.Config;
import com.tangosol.io.NamedSerializerFactory;
import com.tangosol.io.Serializer;
import com.tangosol.net.events.EventDispatcher;
import com.tangosol.net.grpc.GrpcDependencies;
import com.tangosol.util.ExternalizableHelper;
import io.grpc.Channel;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
/**
* A base class for gRPC clients.
*
* @param the type of value this client contains
*
* @author Jonathan Knight 2023.02.02
* @since 23.03
*/
public abstract class BaseGrpcClient
{
// ----- constructors ---------------------------------------------------
/**
* Creates an {@link AsyncNamedCacheClient} from the specified
* {@link AsyncNamedCacheClient.Dependencies}.
*
* @param dependencies the {@link AsyncNamedCacheClient.Dependencies} to configure this
* {@link AsyncNamedCacheClient}.
*/
public BaseGrpcClient(Dependencies dependencies)
{
f_dependencies = dependencies;
f_sName = dependencies.getName();
f_dispatcher = dependencies.getEventDispatcher();
f_sScopeName = dependencies.getScopeName().orElse(GrpcDependencies.DEFAULT_SCOPE);
f_executor = dependencies.getExecutor().orElseGet(BaseGrpcClient::createDefaultExecutor);
f_sFormat = dependencies.getSerializerFormat()
.orElseGet(() -> dependencies.getSerializer()
.map(Serializer::getName)
.orElseGet(BaseGrpcClient::getDefaultSerializerFormat));
f_serializer = dependencies.getSerializer().orElseGet(() -> createSerializer(f_sFormat));
}
// ----- helper methods -------------------------------------------------
/**
* Return {@code true} if the cache has been released.
*
* @return {@code true} if the cache has been released
*/
public boolean isReleased()
{
return m_fReleased;
}
/**
* Return {@code true} if the cache has been destroyed.
*
* @return {@code true} if the cache has been destroyed
*/
public boolean isDestroyed()
{
return m_fDestroyed;
}
/**
* Helper method for cache active checks.
*
* @return {@code true} if the cache is still active
*/
public boolean isActiveInternal()
{
return !m_fReleased && !m_fDestroyed;
}
/**
* Obtain the default {@link Serializer} to be used by the cache.
*
* @return the default {@link Serializer} to be used by the cache
*/
protected static Serializer createSerializer(String sFormat)
{
return NamedSerializerFactory.DEFAULT.getNamedSerializer(sFormat, Classes.getContextClassLoader());
}
/**
* Return the default serialization format.
*
* The default format will be Java serialization unless
* the {@code coherence.pof.enabled} property is set
* when it will be POF.
*
* @return the default serialization format
*/
protected static String getDefaultSerializerFormat()
{
return Config.getBoolean("coherence.pof.enabled") ? "pof" : "java";
}
/**
* Obtain the default {@link Executor} to be used by the cache.
*
* @return the default {@link Executor} to be used by the cache
*/
protected static Executor createDefaultExecutor()
{
return Executors.newSingleThreadExecutor();
}
/**
* A utility method to serialize an Object to {@link BytesValue}.
*
* @param obj the object to convert to {@link BytesValue}.
*
* @return the {@link BytesValue} for the specified object
*/
protected BytesValue toBytesValue(Object obj)
{
return BytesValue.of(toByteString(obj));
}
/**
* A utility method to serialize an Object to {@link ByteString}.
*
* @param obj the object to convert to {@link ByteString}.
*
* @return the {@link ByteString} for the specified object
*/
protected ByteString toByteString(Object obj)
{
return UnsafeByteOperations.unsafeWrap(ExternalizableHelper.toBinary(obj, f_serializer).toByteBuffer());
}
/**
* A utility method to deserialize an {@link OptionalValue} to an Object.
*
* If no value is present in the {@link OptionalValue} then the default
* value is returned.
*
* @param optional the {@link OptionalValue} to deserialize an Object.
* @param defaultValue the value to return if the {link @OptionalValue} does
* not contain a value
*
* @return an object from the specified {@link BytesValue}
*/
protected V valueFromOptionalValue(OptionalValue optional, V defaultValue)
{
if (optional.getPresent())
{
return fromByteString(optional.getValue());
}
return defaultValue;
}
/**
* A utility method to deserialize a {@link BytesValue} to an Object.
*
* @param bv the {@link BytesValue} to deserialize an Object.
*
* @return an object from the specified {@link BytesValue}
*/
protected V valueFromBytesValue(BytesValue bv)
{
return fromBytesValue(bv);
}
/**
* A utility method to deserialize a {@link BytesValue} to an Object.
*
* @param bytes the {@link BytesValue} to deserialize an Object.
*
* @return an object from the specified {@link BytesValue}
*/
protected T fromBytesValue(BytesValue bytes)
{
return BinaryHelper.fromBytesValue(bytes, f_serializer);
}
/**
* A utility method to deserialize a {@link ByteString} to an Object.
*
* @param bytes the {@link ByteString} to deserialize an Object.
*
* @return an object from the specified {@link ByteString}
*/
protected T fromByteString(ByteString bytes)
{
return BinaryHelper.fromByteString(bytes, f_serializer);
}
/**
* Create a failed {@link CompletableFuture}.
*
* @param t the error to use
* @param the type of the future
*
* @return a failed {@link CompletableFuture}
*/
protected CompletableFuture failedFuture(Throwable t)
{
CompletableFuture future = new CompletableFuture<>();
future.completeExceptionally(t);
return future;
}
// ----- Dependencies ---------------------------------------------------
/**
* The dependencies used to create an {@link AsyncNamedCacheClient}.
*/
public interface Dependencies
{
/**
* Return the underlying resource name.
*
* @return the underlying resource name
*/
String getName();
/**
* Returns the gRPC {@link Channel}.
*
* This method must not return {@code null}.
*
* @return the gRPC {@link Channel}
*/
Channel getChannel();
/**
* Returns the scope named used to link requests
* to a specific server side scope.
*
* @return the scope named used to for requests
*/
Optional getScopeName();
/**
* Return the {@link Serializer} to use to
* serialize request and response payloads.
*
* @return the {@link Serializer} to use for
* request and response payloads
*/
Optional getSerializer();
/**
* Return the name of the serialization format to be used
* for requests and responses.
*
* @return the name of the serialization format to be used
* for requests and responses
*/
Optional getSerializerFormat();
/**
* Return the optional {@link Executor} to use.
*
* @return the optional {@link Executor} to use
*/
Optional getExecutor();
/**
* Returns the event dispatcher for the resource.
*
* @return the event dispatcher for the resource
*/
EventDispatcher getEventDispatcher();
/**
* Obtain a default rpc deadline value.
*
* If set to a value less than or equal to zero, a value of 30 seconds is used.
*
* @return the default request timeout
*/
default long getDeadline()
{
return GrpcDependencies.DEFAULT_DEADLINE_MILLIS;
}
}
// ----- DefaultDependencies ----------------------------------------
/**
* The default dependencies implementation.
*/
public static class DefaultDependencies
implements Dependencies
{
// ----- constructors -----------------------------------------------
/**
* Create a {@link AsyncNamedCacheClient.DefaultDependencies}.
*
* @param channel the gRPC {@link Channel} to use
* @param dispatcher the {@link EventDispatcher} to use for lifecycle events
*/
public DefaultDependencies(String sName, Channel channel, EventDispatcher dispatcher)
{
f_sName = sName;
f_channel = channel;
m_sScopeName = GrpcDependencies.DEFAULT_SCOPE;
f_dispatcher = dispatcher;
}
// ----- Dependencies methods ---------------------------------------
@Override
public String getName()
{
return f_sName;
}
@Override
public Channel getChannel()
{
return f_channel;
}
@Override
public Optional getScopeName()
{
return Optional.ofNullable(m_sScopeName);
}
@Override
public Optional getSerializer()
{
return Optional.ofNullable(m_serializer);
}
@Override
public Optional getSerializerFormat()
{
return Optional.ofNullable(m_serializerFormat);
}
@Override
public Optional getExecutor()
{
return Optional.ofNullable(m_executor);
}
@Override
public EventDispatcher getEventDispatcher()
{
return f_dispatcher;
}
@Override
public long getDeadline()
{
if (m_cDeadlineMillis <= 0)
{
return Dependencies.super.getDeadline();
}
return m_cDeadlineMillis;
}
// ----- setters ----------------------------------------------------
/**
* Set the scope name.
*
* @param sScopeName the scope name
*/
public void setScope(String sScopeName)
{
m_sScopeName = GrpcDependencies.DEFAULT_SCOPE_ALIAS.equals(sScopeName)
? GrpcDependencies.DEFAULT_SCOPE : sScopeName;
}
/**
* Set the optional {@link Executor} to use instead
* of a {@link SimpleDaemonPoolExecutor}.
*
* @param executor the optional {@link Executor} to use
*/
public void setExecutor(Executor executor)
{
m_executor = executor;
}
/**
* Set the serialization format to use for requests and
* responses.
*
* Calling this method will remove any {@link Serializer} set by calling
* {@link #setSerializer(Serializer)} or {@link #setSerializer(Serializer, String)}.
*
* A {@link Serializer} configuration with the specified name must exist in the
* Coherence Operational Configuration.
*
* @param sFormat the serialization format and reference to a {@link Serializer}
* configuration in the Coherence Operational Configuration
*/
@SuppressWarnings("unused")
public void setSerializerFormat(String sFormat)
{
m_serializerFormat = sFormat;
m_serializer = null;
}
/**
* Set the {@link Serializer} to use for requests and response payloads.
*
* The serialization format used will be obtained by calling the
* {@link Serializer#getName()} method on the serializer.
*
* @param serializer the {@link Serializer} to use to serialize request
* and response payloads
*/
public void setSerializer(Serializer serializer)
{
String sFormat = serializer == null ? null : serializer.getName();
setSerializer(serializer, sFormat);
}
/**
* Set the {@link Serializer} and serialization format name to use for
* requests and response payloads.
*
*
* @param serializer the {@link Serializer} to use to serialize request
* and response payloads
* @param sFormat the serialization format name
*/
public void setSerializer(Serializer serializer, String sFormat)
{
m_serializer = serializer;
m_serializerFormat = sFormat;
}
/**
* Set the rpc deadline to use.
*
* @param cMillis rpc deadline
*/
public void setDeadline(long cMillis)
{
m_cDeadlineMillis = cMillis;
}
// ----- data members -----------------------------------------------
/**
* The underlying resource name.
*/
private final String f_sName;
/**
* The gRPC {@link Channel} to use to connect to the server.
*/
private final Channel f_channel;
/**
* The event dispatcher for the cache.
*/
private final EventDispatcher f_dispatcher;
/**
* The server side scope name to use in requests.
*/
private String m_sScopeName;
/**
* An optional {@link Executor} to use.
*/
private Executor m_executor;
/**
* The {@link Serializer} to use for request and response payloads.
*/
private Serializer m_serializer;
/**
* The name of the serialization format.
*/
private String m_serializerFormat;
/**
* The request timeout.
*/
private long m_cDeadlineMillis;
}
// ----- data members ---------------------------------------------------
/**
* The scope name to use for requests.
*/
protected final String f_sScopeName;
/**
* The cache name.
*/
protected final String f_sName;
/**
* The {@link Serializer} to use.
*/
protected final Serializer f_serializer;
/**
* The serialization format.
*/
protected final String f_sFormat;
/**
* A flag indicating whether this client has been released.
*/
protected volatile boolean m_fReleased;
/**
* A flag indicating whether this client has been destroyed.
*/
protected volatile boolean m_fDestroyed;
/**
* The {@link Executor} to use to dispatch events.
*/
protected final Executor f_executor;
/**
* The event dispatcher for this cache.
*/
protected final EventDispatcher f_dispatcher;
/**
* The service dependencies.
*/
protected final Dependencies f_dependencies;
}