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ManagedChannelImplBuilder.java
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ManagedChannelImplBuilder.java
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/*
* Copyright 2020 The gRPC Authors
*
* Licensed 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 io.grpc.internal;
import static com.google.common.base.Preconditions.checkArgument;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.util.concurrent.MoreExecutors;
import com.google.errorprone.annotations.DoNotCall;
import io.grpc.Attributes;
import io.grpc.BinaryLog;
import io.grpc.CallCredentials;
import io.grpc.ChannelCredentials;
import io.grpc.ClientInterceptor;
import io.grpc.CompressorRegistry;
import io.grpc.DecompressorRegistry;
import io.grpc.EquivalentAddressGroup;
import io.grpc.InternalChannelz;
import io.grpc.InternalGlobalInterceptors;
import io.grpc.ManagedChannel;
import io.grpc.ManagedChannelBuilder;
import io.grpc.NameResolver;
import io.grpc.NameResolverRegistry;
import io.grpc.ProxyDetector;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.SocketAddress;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Executor;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Nullable;
/**
* Default managed channel builder, for usage in Transport implementations.
*/
public final class ManagedChannelImplBuilder
extends ManagedChannelBuilder<ManagedChannelImplBuilder> {
private static final String DIRECT_ADDRESS_SCHEME = "directaddress";
private static final Logger log = Logger.getLogger(ManagedChannelImplBuilder.class.getName());
@DoNotCall("ClientTransportFactoryBuilder is required, use a constructor")
public static ManagedChannelBuilder<?> forAddress(String name, int port) {
throw new UnsupportedOperationException(
"ClientTransportFactoryBuilder is required, use a constructor");
}
@DoNotCall("ClientTransportFactoryBuilder is required, use a constructor")
public static ManagedChannelBuilder<?> forTarget(String target) {
throw new UnsupportedOperationException(
"ClientTransportFactoryBuilder is required, use a constructor");
}
/**
* An idle timeout larger than this would disable idle mode.
*/
@VisibleForTesting
static final long IDLE_MODE_MAX_TIMEOUT_DAYS = 30;
/**
* The default idle timeout.
*/
@VisibleForTesting
static final long IDLE_MODE_DEFAULT_TIMEOUT_MILLIS = TimeUnit.MINUTES.toMillis(30);
/**
* An idle timeout smaller than this would be capped to it.
*/
static final long IDLE_MODE_MIN_TIMEOUT_MILLIS = TimeUnit.SECONDS.toMillis(1);
private static final ObjectPool<? extends Executor> DEFAULT_EXECUTOR_POOL =
SharedResourcePool.forResource(GrpcUtil.SHARED_CHANNEL_EXECUTOR);
private static final DecompressorRegistry DEFAULT_DECOMPRESSOR_REGISTRY =
DecompressorRegistry.getDefaultInstance();
private static final CompressorRegistry DEFAULT_COMPRESSOR_REGISTRY =
CompressorRegistry.getDefaultInstance();
private static final long DEFAULT_RETRY_BUFFER_SIZE_IN_BYTES = 1L << 24; // 16M
private static final long DEFAULT_PER_RPC_BUFFER_LIMIT_IN_BYTES = 1L << 20; // 1M
ObjectPool<? extends Executor> executorPool = DEFAULT_EXECUTOR_POOL;
ObjectPool<? extends Executor> offloadExecutorPool = DEFAULT_EXECUTOR_POOL;
private final List<ClientInterceptor> interceptors = new ArrayList<>();
final NameResolverRegistry nameResolverRegistry = NameResolverRegistry.getDefaultRegistry();
// Access via getter, which may perform authority override as needed
NameResolver.Factory nameResolverFactory = nameResolverRegistry.asFactory();
final String target;
@Nullable
final ChannelCredentials channelCredentials;
@Nullable
final CallCredentials callCredentials;
@Nullable
private final SocketAddress directServerAddress;
@Nullable
String userAgent;
@Nullable
String authorityOverride;
String defaultLbPolicy = GrpcUtil.DEFAULT_LB_POLICY;
boolean fullStreamDecompression;
DecompressorRegistry decompressorRegistry = DEFAULT_DECOMPRESSOR_REGISTRY;
CompressorRegistry compressorRegistry = DEFAULT_COMPRESSOR_REGISTRY;
long idleTimeoutMillis = IDLE_MODE_DEFAULT_TIMEOUT_MILLIS;
int maxRetryAttempts = 5;
int maxHedgedAttempts = 5;
long retryBufferSize = DEFAULT_RETRY_BUFFER_SIZE_IN_BYTES;
long perRpcBufferLimit = DEFAULT_PER_RPC_BUFFER_LIMIT_IN_BYTES;
boolean retryEnabled = true;
InternalChannelz channelz = InternalChannelz.instance();
int maxTraceEvents;
@Nullable
Map<String, ?> defaultServiceConfig;
boolean lookUpServiceConfig = true;
@Nullable
BinaryLog binlog;
@Nullable
ProxyDetector proxyDetector;
private boolean authorityCheckerDisabled;
private boolean statsEnabled = true;
private boolean recordStartedRpcs = true;
private boolean recordFinishedRpcs = true;
private boolean recordRealTimeMetrics = false;
private boolean recordRetryMetrics = true;
private boolean tracingEnabled = true;
/**
* An interface for Transport implementors to provide the {@link ClientTransportFactory}
* appropriate for the channel.
*/
public interface ClientTransportFactoryBuilder {
ClientTransportFactory buildClientTransportFactory();
}
/**
* Convenience ClientTransportFactoryBuilder, throws UnsupportedOperationException().
*/
public static class UnsupportedClientTransportFactoryBuilder implements
ClientTransportFactoryBuilder {
@Override
public ClientTransportFactory buildClientTransportFactory() {
throw new UnsupportedOperationException();
}
}
/**
* An interface for Transport implementors to provide a default port to {@link
* io.grpc.NameResolver} for use in cases where the target string doesn't include a port. The
* default implementation returns {@link GrpcUtil#DEFAULT_PORT_SSL}.
*/
public interface ChannelBuilderDefaultPortProvider {
int getDefaultPort();
}
/**
* Default implementation of {@link ChannelBuilderDefaultPortProvider} that returns a fixed port.
*/
public static final class FixedPortProvider implements ChannelBuilderDefaultPortProvider {
private final int port;
public FixedPortProvider(int port) {
this.port = port;
}
@Override
public int getDefaultPort() {
return port;
}
}
private static final class ManagedChannelDefaultPortProvider implements
ChannelBuilderDefaultPortProvider {
@Override
public int getDefaultPort() {
return GrpcUtil.DEFAULT_PORT_SSL;
}
}
private final ClientTransportFactoryBuilder clientTransportFactoryBuilder;
private final ChannelBuilderDefaultPortProvider channelBuilderDefaultPortProvider;
/**
* Creates a new managed channel builder with a target string, which can be either a valid {@link
* io.grpc.NameResolver}-compliant URI, or an authority string. Transport implementors must
* provide client transport factory builder, and may set custom channel default port provider.
*/
public ManagedChannelImplBuilder(String target,
ClientTransportFactoryBuilder clientTransportFactoryBuilder,
@Nullable ChannelBuilderDefaultPortProvider channelBuilderDefaultPortProvider) {
this(target, null, null, clientTransportFactoryBuilder, channelBuilderDefaultPortProvider);
}
/**
* Creates a new managed channel builder with a target string, which can be either a valid {@link
* io.grpc.NameResolver}-compliant URI, or an authority string. Transport implementors must
* provide client transport factory builder, and may set custom channel default port provider.
*
* @param channelCreds The ChannelCredentials provided by the user. These may be used when
* creating derivative channels.
*/
public ManagedChannelImplBuilder(
String target, @Nullable ChannelCredentials channelCreds, @Nullable CallCredentials callCreds,
ClientTransportFactoryBuilder clientTransportFactoryBuilder,
@Nullable ChannelBuilderDefaultPortProvider channelBuilderDefaultPortProvider) {
this.target = Preconditions.checkNotNull(target, "target");
this.channelCredentials = channelCreds;
this.callCredentials = callCreds;
this.clientTransportFactoryBuilder = Preconditions
.checkNotNull(clientTransportFactoryBuilder, "clientTransportFactoryBuilder");
this.directServerAddress = null;
if (channelBuilderDefaultPortProvider != null) {
this.channelBuilderDefaultPortProvider = channelBuilderDefaultPortProvider;
} else {
this.channelBuilderDefaultPortProvider = new ManagedChannelDefaultPortProvider();
}
}
/**
* Returns a target string for the SocketAddress. It is only used as a placeholder, because
* DirectAddressNameResolverFactory will not actually try to use it. However, it must be a valid
* URI.
*/
@VisibleForTesting
static String makeTargetStringForDirectAddress(SocketAddress address) {
try {
return new URI(DIRECT_ADDRESS_SCHEME, "", "/" + address, null).toString();
} catch (URISyntaxException e) {
// It should not happen.
throw new RuntimeException(e);
}
}
/**
* Creates a new managed channel builder with the given server address, authority string of the
* channel. Transport implementors must provide client transport factory builder, and may set
* custom channel default port provider.
*/
public ManagedChannelImplBuilder(SocketAddress directServerAddress, String authority,
ClientTransportFactoryBuilder clientTransportFactoryBuilder,
@Nullable ChannelBuilderDefaultPortProvider channelBuilderDefaultPortProvider) {
this(directServerAddress, authority, null, null, clientTransportFactoryBuilder,
channelBuilderDefaultPortProvider);
}
/**
* Creates a new managed channel builder with the given server address, authority string of the
* channel. Transport implementors must provide client transport factory builder, and may set
* custom channel default port provider.
*
* @param channelCreds The ChannelCredentials provided by the user. These may be used when
* creating derivative channels.
*/
public ManagedChannelImplBuilder(SocketAddress directServerAddress, String authority,
@Nullable ChannelCredentials channelCreds, @Nullable CallCredentials callCreds,
ClientTransportFactoryBuilder clientTransportFactoryBuilder,
@Nullable ChannelBuilderDefaultPortProvider channelBuilderDefaultPortProvider) {
this.target = makeTargetStringForDirectAddress(directServerAddress);
this.channelCredentials = channelCreds;
this.callCredentials = callCreds;
this.clientTransportFactoryBuilder = Preconditions
.checkNotNull(clientTransportFactoryBuilder, "clientTransportFactoryBuilder");
this.directServerAddress = directServerAddress;
this.nameResolverFactory = new DirectAddressNameResolverFactory(directServerAddress, authority);
if (channelBuilderDefaultPortProvider != null) {
this.channelBuilderDefaultPortProvider = channelBuilderDefaultPortProvider;
} else {
this.channelBuilderDefaultPortProvider = new ManagedChannelDefaultPortProvider();
}
}
@Override
public ManagedChannelImplBuilder directExecutor() {
return executor(MoreExecutors.directExecutor());
}
@Override
public ManagedChannelImplBuilder executor(Executor executor) {
if (executor != null) {
this.executorPool = new FixedObjectPool<>(executor);
} else {
this.executorPool = DEFAULT_EXECUTOR_POOL;
}
return this;
}
@Override
public ManagedChannelImplBuilder offloadExecutor(Executor executor) {
if (executor != null) {
this.offloadExecutorPool = new FixedObjectPool<>(executor);
} else {
this.offloadExecutorPool = DEFAULT_EXECUTOR_POOL;
}
return this;
}
@Override
public ManagedChannelImplBuilder intercept(List<ClientInterceptor> interceptors) {
this.interceptors.addAll(interceptors);
return this;
}
@Override
public ManagedChannelImplBuilder intercept(ClientInterceptor... interceptors) {
return intercept(Arrays.asList(interceptors));
}
@Deprecated
@Override
public ManagedChannelImplBuilder nameResolverFactory(NameResolver.Factory resolverFactory) {
Preconditions.checkState(directServerAddress == null,
"directServerAddress is set (%s), which forbids the use of NameResolverFactory",
directServerAddress);
if (resolverFactory != null) {
this.nameResolverFactory = resolverFactory;
} else {
this.nameResolverFactory = nameResolverRegistry.asFactory();
}
return this;
}
@Override
public ManagedChannelImplBuilder defaultLoadBalancingPolicy(String policy) {
Preconditions.checkState(directServerAddress == null,
"directServerAddress is set (%s), which forbids the use of load-balancing policy",
directServerAddress);
Preconditions.checkArgument(policy != null, "policy cannot be null");
this.defaultLbPolicy = policy;
return this;
}
@Override
public ManagedChannelImplBuilder enableFullStreamDecompression() {
this.fullStreamDecompression = true;
return this;
}
@Override
public ManagedChannelImplBuilder decompressorRegistry(DecompressorRegistry registry) {
if (registry != null) {
this.decompressorRegistry = registry;
} else {
this.decompressorRegistry = DEFAULT_DECOMPRESSOR_REGISTRY;
}
return this;
}
@Override
public ManagedChannelImplBuilder compressorRegistry(CompressorRegistry registry) {
if (registry != null) {
this.compressorRegistry = registry;
} else {
this.compressorRegistry = DEFAULT_COMPRESSOR_REGISTRY;
}
return this;
}
@Override
public ManagedChannelImplBuilder userAgent(@Nullable String userAgent) {
this.userAgent = userAgent;
return this;
}
@Override
public ManagedChannelImplBuilder overrideAuthority(String authority) {
this.authorityOverride = checkAuthority(authority);
return this;
}
@Override
public ManagedChannelImplBuilder idleTimeout(long value, TimeUnit unit) {
checkArgument(value > 0, "idle timeout is %s, but must be positive", value);
// We convert to the largest unit to avoid overflow
if (unit.toDays(value) >= IDLE_MODE_MAX_TIMEOUT_DAYS) {
// This disables idle mode
this.idleTimeoutMillis = ManagedChannelImpl.IDLE_TIMEOUT_MILLIS_DISABLE;
} else {
this.idleTimeoutMillis = Math.max(unit.toMillis(value), IDLE_MODE_MIN_TIMEOUT_MILLIS);
}
return this;
}
@Override
public ManagedChannelImplBuilder maxRetryAttempts(int maxRetryAttempts) {
this.maxRetryAttempts = maxRetryAttempts;
return this;
}
@Override
public ManagedChannelImplBuilder maxHedgedAttempts(int maxHedgedAttempts) {
this.maxHedgedAttempts = maxHedgedAttempts;
return this;
}
@Override
public ManagedChannelImplBuilder retryBufferSize(long bytes) {
checkArgument(bytes > 0L, "retry buffer size must be positive");
retryBufferSize = bytes;
return this;
}
@Override
public ManagedChannelImplBuilder perRpcBufferLimit(long bytes) {
checkArgument(bytes > 0L, "per RPC buffer limit must be positive");
perRpcBufferLimit = bytes;
return this;
}
@Override
public ManagedChannelImplBuilder disableRetry() {
retryEnabled = false;
return this;
}
@Override
public ManagedChannelImplBuilder enableRetry() {
retryEnabled = true;
return this;
}
@Override
public ManagedChannelImplBuilder setBinaryLog(BinaryLog binlog) {
this.binlog = binlog;
return this;
}
@Override
public ManagedChannelImplBuilder maxTraceEvents(int maxTraceEvents) {
checkArgument(maxTraceEvents >= 0, "maxTraceEvents must be non-negative");
this.maxTraceEvents = maxTraceEvents;
return this;
}
@Override
public ManagedChannelImplBuilder proxyDetector(@Nullable ProxyDetector proxyDetector) {
this.proxyDetector = proxyDetector;
return this;
}
@Override
public ManagedChannelImplBuilder defaultServiceConfig(@Nullable Map<String, ?> serviceConfig) {
// TODO(notcarl): use real parsing
defaultServiceConfig = checkMapEntryTypes(serviceConfig);
return this;
}
@Nullable
private static Map<String, ?> checkMapEntryTypes(@Nullable Map<?, ?> map) {
if (map == null) {
return null;
}
// Not using ImmutableMap.Builder because of extra guava dependency for Android.
Map<String, Object> parsedMap = new LinkedHashMap<>();
for (Map.Entry<?, ?> entry : map.entrySet()) {
checkArgument(
entry.getKey() instanceof String,
"The key of the entry '%s' is not of String type", entry);
String key = (String) entry.getKey();
Object value = entry.getValue();
if (value == null) {
parsedMap.put(key, null);
} else if (value instanceof Map) {
parsedMap.put(key, checkMapEntryTypes((Map<?, ?>) value));
} else if (value instanceof List) {
parsedMap.put(key, checkListEntryTypes((List<?>) value));
} else if (value instanceof String) {
parsedMap.put(key, value);
} else if (value instanceof Double) {
parsedMap.put(key, value);
} else if (value instanceof Boolean) {
parsedMap.put(key, value);
} else {
throw new IllegalArgumentException(
"The value of the map entry '" + entry + "' is of type '" + value.getClass()
+ "', which is not supported");
}
}
return Collections.unmodifiableMap(parsedMap);
}
private static List<?> checkListEntryTypes(List<?> list) {
List<Object> parsedList = new ArrayList<>(list.size());
for (Object value : list) {
if (value == null) {
parsedList.add(null);
} else if (value instanceof Map) {
parsedList.add(checkMapEntryTypes((Map<?, ?>) value));
} else if (value instanceof List) {
parsedList.add(checkListEntryTypes((List<?>) value));
} else if (value instanceof String) {
parsedList.add(value);
} else if (value instanceof Double) {
parsedList.add(value);
} else if (value instanceof Boolean) {
parsedList.add(value);
} else {
throw new IllegalArgumentException(
"The entry '" + value + "' is of type '" + value.getClass()
+ "', which is not supported");
}
}
return Collections.unmodifiableList(parsedList);
}
@Override
public ManagedChannelImplBuilder disableServiceConfigLookUp() {
this.lookUpServiceConfig = false;
return this;
}
/**
* Disable or enable stats features. Enabled by default.
*
* <p>For the current release, calling {@code setStatsEnabled(true)} may have a side effect that
* disables retry.
*/
public void setStatsEnabled(boolean value) {
statsEnabled = value;
}
/**
* Disable or enable stats recording for RPC upstarts. Effective only if {@link
* #setStatsEnabled} is set to true. Enabled by default.
*/
public void setStatsRecordStartedRpcs(boolean value) {
recordStartedRpcs = value;
}
/**
* Disable or enable stats recording for RPC completions. Effective only if {@link
* #setStatsEnabled} is set to true. Enabled by default.
*/
public void setStatsRecordFinishedRpcs(boolean value) {
recordFinishedRpcs = value;
}
/**
* Disable or enable real-time metrics recording. Effective only if {@link #setStatsEnabled} is
* set to true. Disabled by default.
*/
public void setStatsRecordRealTimeMetrics(boolean value) {
recordRealTimeMetrics = value;
}
public void setStatsRecordRetryMetrics(boolean value) {
recordRetryMetrics = value;
}
/**
* Disable or enable tracing features. Enabled by default.
*/
public void setTracingEnabled(boolean value) {
tracingEnabled = value;
}
/**
* Verifies the authority is valid.
*/
@VisibleForTesting
String checkAuthority(String authority) {
if (authorityCheckerDisabled) {
return authority;
}
return GrpcUtil.checkAuthority(authority);
}
/** Disable the check whether the authority is valid. */
public ManagedChannelImplBuilder disableCheckAuthority() {
authorityCheckerDisabled = true;
return this;
}
/** Enable previously disabled authority check. */
public ManagedChannelImplBuilder enableCheckAuthority() {
authorityCheckerDisabled = false;
return this;
}
@Override
public ManagedChannel build() {
return new ManagedChannelOrphanWrapper(new ManagedChannelImpl(
this,
clientTransportFactoryBuilder.buildClientTransportFactory(),
new ExponentialBackoffPolicy.Provider(),
SharedResourcePool.forResource(GrpcUtil.SHARED_CHANNEL_EXECUTOR),
GrpcUtil.STOPWATCH_SUPPLIER,
getEffectiveInterceptors(),
TimeProvider.SYSTEM_TIME_PROVIDER));
}
// Temporarily disable retry when stats or tracing is enabled to avoid breakage, until we know
// what should be the desired behavior for retry + stats/tracing.
// TODO(zdapeng): FIX IT
@VisibleForTesting
List<ClientInterceptor> getEffectiveInterceptors() {
List<ClientInterceptor> effectiveInterceptors = new ArrayList<>(this.interceptors);
boolean isGlobalInterceptorsSet = false;
List<ClientInterceptor> globalClientInterceptors =
InternalGlobalInterceptors.getClientInterceptors();
if (globalClientInterceptors != null) {
effectiveInterceptors.addAll(globalClientInterceptors);
isGlobalInterceptorsSet = true;
}
if (!isGlobalInterceptorsSet && statsEnabled) {
ClientInterceptor statsInterceptor = null;
try {
Class<?> censusStatsAccessor =
Class.forName("io.grpc.census.InternalCensusStatsAccessor");
Method getClientInterceptorMethod =
censusStatsAccessor.getDeclaredMethod(
"getClientInterceptor",
boolean.class,
boolean.class,
boolean.class,
boolean.class);
statsInterceptor =
(ClientInterceptor) getClientInterceptorMethod
.invoke(
null,
recordStartedRpcs,
recordFinishedRpcs,
recordRealTimeMetrics,
recordRetryMetrics);
} catch (ClassNotFoundException e) {
// Replace these separate catch statements with multicatch when Android min-API >= 19
log.log(Level.FINE, "Unable to apply census stats", e);
} catch (NoSuchMethodException e) {
log.log(Level.FINE, "Unable to apply census stats", e);
} catch (IllegalAccessException e) {
log.log(Level.FINE, "Unable to apply census stats", e);
} catch (InvocationTargetException e) {
log.log(Level.FINE, "Unable to apply census stats", e);
}
if (statsInterceptor != null) {
// First interceptor runs last (see ClientInterceptors.intercept()), so that no
// other interceptor can override the tracer factory we set in CallOptions.
effectiveInterceptors.add(0, statsInterceptor);
}
}
if (!isGlobalInterceptorsSet && tracingEnabled) {
ClientInterceptor tracingInterceptor = null;
try {
Class<?> censusTracingAccessor =
Class.forName("io.grpc.census.InternalCensusTracingAccessor");
Method getClientInterceptroMethod =
censusTracingAccessor.getDeclaredMethod("getClientInterceptor");
tracingInterceptor = (ClientInterceptor) getClientInterceptroMethod.invoke(null);
} catch (ClassNotFoundException e) {
// Replace these separate catch statements with multicatch when Android min-API >= 19
log.log(Level.FINE, "Unable to apply census stats", e);
} catch (NoSuchMethodException e) {
log.log(Level.FINE, "Unable to apply census stats", e);
} catch (IllegalAccessException e) {
log.log(Level.FINE, "Unable to apply census stats", e);
} catch (InvocationTargetException e) {
log.log(Level.FINE, "Unable to apply census stats", e);
}
if (tracingInterceptor != null) {
effectiveInterceptors.add(0, tracingInterceptor);
}
}
return effectiveInterceptors;
}
/**
* Returns a default port to {@link NameResolver} for use in cases where the target string doesn't
* include a port. The default implementation returns {@link GrpcUtil#DEFAULT_PORT_SSL}.
*/
int getDefaultPort() {
return channelBuilderDefaultPortProvider.getDefaultPort();
}
private static class DirectAddressNameResolverFactory extends NameResolver.Factory {
final SocketAddress address;
final String authority;
DirectAddressNameResolverFactory(SocketAddress address, String authority) {
this.address = address;
this.authority = authority;
}
@Override
public NameResolver newNameResolver(URI notUsedUri, NameResolver.Args args) {
return new NameResolver() {
@Override
public String getServiceAuthority() {
return authority;
}
@Override
public void start(Listener2 listener) {
listener.onResult(
ResolutionResult.newBuilder()
.setAddresses(Collections.singletonList(new EquivalentAddressGroup(address)))
.setAttributes(Attributes.EMPTY)
.build());
}
@Override
public void shutdown() {}
};
}
@Override
public String getDefaultScheme() {
return DIRECT_ADDRESS_SCHEME;
}
}
/**
* Returns the internal offload executor pool for offloading tasks.
*/
public ObjectPool<? extends Executor> getOffloadExecutorPool() {
return this.offloadExecutorPool;
}
}