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/*
* Copyright 2015 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;
import com.google.common.base.Preconditions;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Executor;
import java.util.concurrent.TimeUnit;
import javax.annotation.Nullable;
/**
* A builder for {@link ManagedChannel} instances.
*
* @param The concrete type of this builder.
*/
public abstract class ManagedChannelBuilder> {
/**
* Creates a channel with the target's address and port number.
*
* @see #forTarget(String)
* @since 1.0.0
*/
public static ManagedChannelBuilder forAddress(String name, int port) {
return ManagedChannelProvider.provider().builderForAddress(name, port);
}
/**
* Creates a channel with a target string, which can be either a valid {@link
* NameResolver}-compliant URI, or an authority string.
*
* A {@code NameResolver}-compliant URI is an absolute hierarchical URI as defined by {@link
* java.net.URI}. Example URIs:
*
* - {@code "dns:///foo.googleapis.com:8080"}
* - {@code "dns:///foo.googleapis.com"}
* - {@code "dns:///%5B2001:db8:85a3:8d3:1319:8a2e:370:7348%5D:443"}
* - {@code "dns://8.8.8.8/foo.googleapis.com:8080"}
* - {@code "dns://8.8.8.8/foo.googleapis.com"}
* - {@code "zookeeper://zk.example.com:9900/example_service"}
*
*
* An authority string will be converted to a {@code NameResolver}-compliant URI, which has
* the scheme from the name resolver with the highest priority (e.g. {@code "dns"}),
* no authority, and the original authority string as its path after properly escaped.
* We recommend libraries to specify the schema explicitly if it is known, since libraries cannot
* know which NameResolver will be default during runtime.
* Example authority strings:
*
* - {@code "localhost"}
* - {@code "127.0.0.1"}
* - {@code "localhost:8080"}
* - {@code "foo.googleapis.com:8080"}
* - {@code "127.0.0.1:8080"}
* - {@code "[2001:db8:85a3:8d3:1319:8a2e:370:7348]"}
* - {@code "[2001:db8:85a3:8d3:1319:8a2e:370:7348]:443"}
*
*
* @since 1.0.0
*/
public static ManagedChannelBuilder forTarget(String target) {
return ManagedChannelProvider.provider().builderForTarget(target);
}
/**
* Execute application code directly in the transport thread.
*
* Depending on the underlying transport, using a direct executor may lead to substantial
* performance improvements. However, it also requires the application to not block under
* any circumstances.
*
*
Calling this method is semantically equivalent to calling {@link #executor(Executor)} and
* passing in a direct executor. However, this is the preferred way as it may allow the transport
* to perform special optimizations.
*
* @return this
* @since 1.0.0
*/
public abstract T directExecutor();
/**
* Provides a custom executor.
*
*
It's an optional parameter. If the user has not provided an executor when the channel is
* built, the builder will use a static cached thread pool.
*
*
The channel won't take ownership of the given executor. It's caller's responsibility to
* shut down the executor when it's desired.
*
* @return this
* @since 1.0.0
*/
public abstract T executor(Executor executor);
/**
* Provides a custom executor that will be used for operations that block or are expensive.
*
*
It's an optional parameter. If the user has not provided an executor when the channel is
* built, the builder will use a static cached thread pool.
*
*
The channel won't take ownership of the given executor. It's caller's responsibility to shut
* down the executor when it's desired.
*
* @return this
* @throws UnsupportedOperationException if unsupported
* @since 1.25.0
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/6279")
public T offloadExecutor(Executor executor) {
throw new UnsupportedOperationException();
}
/**
* Adds interceptors that will be called before the channel performs its real work. This is
* functionally equivalent to using {@link ClientInterceptors#intercept(Channel, List)}, but while
* still having access to the original {@code ManagedChannel}. Interceptors run in the reverse
* order in which they are added, just as with consecutive calls to {@code
* ClientInterceptors.intercept()}.
*
* @return this
* @since 1.0.0
*/
public abstract T intercept(List interceptors);
/**
* Adds interceptors that will be called before the channel performs its real work. This is
* functionally equivalent to using {@link ClientInterceptors#intercept(Channel,
* ClientInterceptor...)}, but while still having access to the original {@code ManagedChannel}.
* Interceptors run in the reverse order in which they are added, just as with consecutive calls
* to {@code ClientInterceptors.intercept()}.
*
* @return this
* @since 1.0.0
*/
public abstract T intercept(ClientInterceptor... interceptors);
/**
* Provides a custom {@code User-Agent} for the application.
*
* It's an optional parameter. The library will provide a user agent independent of this
* option. If provided, the given agent will prepend the library's user agent information.
*
* @return this
* @since 1.0.0
*/
public abstract T userAgent(String userAgent);
/**
* Overrides the authority used with TLS and HTTP virtual hosting. It does not change what host is
* actually connected to. Is commonly in the form {@code host:port}.
*
*
If the channel builder overrides authority, any authority override from name resolution
* result (via {@link EquivalentAddressGroup#ATTR_AUTHORITY_OVERRIDE}) will be discarded.
*
*
This method is intended for testing, but may safely be used outside of tests as an
* alternative to DNS overrides.
*
* @return this
* @since 1.0.0
*/
public abstract T overrideAuthority(String authority);
/**
* Use of a plaintext connection to the server. By default a secure connection mechanism
* such as TLS will be used.
*
*
Should only be used for testing or for APIs where the use of such API or the data
* exchanged is not sensitive.
*
*
This assumes prior knowledge that the target of this channel is using plaintext. It will
* not perform HTTP/1.1 upgrades.
*
* @return this
* @throws IllegalStateException if ChannelCredentials were provided when constructing the builder
* @throws UnsupportedOperationException if plaintext mode is not supported.
* @since 1.11.0
*/
public T usePlaintext() {
throw new UnsupportedOperationException();
}
/**
* Makes the client use TLS.
*
* @return this
* @throws IllegalStateException if ChannelCredentials were provided when constructing the builder
* @throws UnsupportedOperationException if transport security is not supported.
* @since 1.9.0
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/3713")
public T useTransportSecurity() {
throw new UnsupportedOperationException();
}
/**
* Provides a custom {@link NameResolver.Factory} for the channel. If this method is not called,
* the builder will try the providers registered in the default {@link NameResolverRegistry} for
* the given target.
*
*
This method should rarely be used, as name resolvers should provide a {@code
* NameResolverProvider} and users rely on service loading to find implementations in the class
* path. That allows application's configuration to easily choose the name resolver via the
* 'target' string passed to {@link ManagedChannelBuilder#forTarget(String)}.
*
* @return this
* @since 1.0.0
* @deprecated Most usages should use a globally-registered {@link NameResolverProvider} instead,
* with either the SPI mechanism or {@link NameResolverRegistry#register}. Replacements for
* all use-cases are not necessarily available yet. See
* #7133.
*/
@Deprecated
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/1770")
public abstract T nameResolverFactory(NameResolver.Factory resolverFactory);
/**
* Sets the default load-balancing policy that will be used if the service config doesn't specify
* one. If not set, the default will be the "pick_first" policy.
*
*
Policy implementations are looked up in the
* {@link LoadBalancerRegistry#getDefaultRegistry default LoadBalancerRegistry}.
*
*
This method is implemented by all stock channel builders that are shipped with gRPC, but may
* not be implemented by custom channel builders, in which case this method will throw.
*
* @return this
* @since 1.18.0
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/1771")
public T defaultLoadBalancingPolicy(String policy) {
throw new UnsupportedOperationException();
}
/**
* Enables full-stream decompression of inbound streams. This will cause the channel's outbound
* headers to advertise support for GZIP compressed streams, and gRPC servers which support the
* feature may respond with a GZIP compressed stream.
*
*
EXPERIMENTAL: This method is here to enable an experimental feature, and may be changed or
* removed once the feature is stable.
*
* @throws UnsupportedOperationException if unsupported
* @since 1.7.0
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/3399")
public T enableFullStreamDecompression() {
throw new UnsupportedOperationException();
}
/**
* Set the decompression registry for use in the channel. This is an advanced API call and
* shouldn't be used unless you are using custom message encoding. The default supported
* decompressors are in {@link DecompressorRegistry#getDefaultInstance}.
*
* @return this
* @since 1.0.0
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/1704")
public abstract T decompressorRegistry(DecompressorRegistry registry);
/**
* Set the compression registry for use in the channel. This is an advanced API call and
* shouldn't be used unless you are using custom message encoding. The default supported
* compressors are in {@link CompressorRegistry#getDefaultInstance}.
*
* @return this
* @since 1.0.0
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/1704")
public abstract T compressorRegistry(CompressorRegistry registry);
/**
* Set the duration without ongoing RPCs before going to idle mode.
*
*
In idle mode the channel shuts down all connections, the NameResolver and the
* LoadBalancer. A new RPC would take the channel out of idle mode. A channel starts in idle mode.
* Defaults to 30 minutes.
*
*
This is an advisory option. Do not rely on any specific behavior related to this option.
*
* @return this
* @since 1.0.0
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/2022")
public abstract T idleTimeout(long value, TimeUnit unit);
/**
* Sets the maximum message size allowed to be received on the channel. If not called,
* defaults to 4 MiB. The default provides protection to clients who haven't considered the
* possibility of receiving large messages while trying to be large enough to not be hit in normal
* usage.
*
*
This method is advisory, and implementations may decide to not enforce this. Currently,
* the only known transport to not enforce this is {@code InProcessTransport}.
*
* @param bytes the maximum number of bytes a single message can be.
* @return this
* @throws IllegalArgumentException if bytes is negative.
* @since 1.1.0
*/
public T maxInboundMessageSize(int bytes) {
// intentional noop rather than throw, this method is only advisory.
Preconditions.checkArgument(bytes >= 0, "bytes must be >= 0");
return thisT();
}
/**
* Sets the maximum size of metadata allowed to be received. {@code Integer.MAX_VALUE} disables
* the enforcement. The default is implementation-dependent, but is not generally less than 8 KiB
* and may be unlimited.
*
*
This is cumulative size of the metadata. The precise calculation is
* implementation-dependent, but implementations are encouraged to follow the calculation used for
*
* HTTP/2's SETTINGS_MAX_HEADER_LIST_SIZE. It sums the bytes from each entry's key and value,
* plus 32 bytes of overhead per entry.
*
* @param bytes the maximum size of received metadata
* @return this
* @throws IllegalArgumentException if bytes is non-positive
* @since 1.17.0
*/
public T maxInboundMetadataSize(int bytes) {
Preconditions.checkArgument(bytes > 0, "maxInboundMetadataSize must be > 0");
// intentional noop rather than throw, this method is only advisory.
return thisT();
}
/**
* Sets the time without read activity before sending a keepalive ping. An unreasonably small
* value might be increased, and {@code Long.MAX_VALUE} nano seconds or an unreasonably large
* value will disable keepalive. Defaults to infinite.
*
*
Clients must receive permission from the service owner before enabling this option.
* Keepalives can increase the load on services and are commonly "invisible" making it hard to
* notice when they are causing excessive load. Clients are strongly encouraged to use only as
* small of a value as necessary.
*
* @throws UnsupportedOperationException if unsupported
* @since 1.7.0
*/
public T keepAliveTime(long keepAliveTime, TimeUnit timeUnit) {
throw new UnsupportedOperationException();
}
/**
* Sets the time waiting for read activity after sending a keepalive ping. If the time expires
* without any read activity on the connection, the connection is considered dead. An unreasonably
* small value might be increased. Defaults to 20 seconds.
*
*
This value should be at least multiple times the RTT to allow for lost packets.
*
* @throws UnsupportedOperationException if unsupported
* @since 1.7.0
*/
public T keepAliveTimeout(long keepAliveTimeout, TimeUnit timeUnit) {
throw new UnsupportedOperationException();
}
/**
* Sets whether keepalive will be performed when there are no outstanding RPC on a connection.
* Defaults to {@code false}.
*
*
Clients must receive permission from the service owner before enabling this option.
* Keepalives on unused connections can easilly accidentally consume a considerable amount of
* bandwidth and CPU. {@link ManagedChannelBuilder#idleTimeout idleTimeout()} should generally be
* used instead of this option.
*
* @throws UnsupportedOperationException if unsupported
* @see #keepAliveTime(long, TimeUnit)
* @since 1.7.0
*/
public T keepAliveWithoutCalls(boolean enable) {
throw new UnsupportedOperationException();
}
/**
* Sets the maximum number of retry attempts that may be configured by the service config. If the
* service config specifies a larger value it will be reduced to this value. Setting this number
* to zero is not effectively the same as {@code disableRetry()} because the former does not
* disable
*
* transparent retry.
*
*
This method may not work as expected for the current release because retry is not fully
* implemented yet.
*
* @return this
* @since 1.11.0
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/3982")
public T maxRetryAttempts(int maxRetryAttempts) {
throw new UnsupportedOperationException();
}
/**
* Sets the maximum number of hedged attempts that may be configured by the service config. If the
* service config specifies a larger value it will be reduced to this value.
*
*
This method may not work as expected for the current release because retry is not fully
* implemented yet.
*
* @return this
* @since 1.11.0
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/3982")
public T maxHedgedAttempts(int maxHedgedAttempts) {
throw new UnsupportedOperationException();
}
/**
* Sets the retry buffer size in bytes. If the buffer limit is exceeded, no RPC
* could retry at the moment, and in hedging case all hedges but one of the same RPC will cancel.
* The implementation may only estimate the buffer size being used rather than count the
* exact physical memory allocated. The method does not have any effect if retry is disabled by
* the client.
*
*
This method may not work as expected for the current release because retry is not fully
* implemented yet.
*
* @return this
* @since 1.10.0
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/3982")
public T retryBufferSize(long bytes) {
throw new UnsupportedOperationException();
}
/**
* Sets the per RPC buffer limit in bytes used for retry. The RPC is not retriable if its buffer
* limit is exceeded. The implementation may only estimate the buffer size being used rather than
* count the exact physical memory allocated. It does not have any effect if retry is disabled by
* the client.
*
*
This method may not work as expected for the current release because retry is not fully
* implemented yet.
*
* @return this
* @since 1.10.0
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/3982")
public T perRpcBufferLimit(long bytes) {
throw new UnsupportedOperationException();
}
/**
* Disables the retry and hedging subsystem provided by the gRPC library. This is designed for the
* case when users have their own retry implementation and want to avoid their own retry taking
* place simultaneously with the gRPC library layer retry.
*
* @return this
* @since 1.11.0
*/
public T disableRetry() {
throw new UnsupportedOperationException();
}
/**
* Enables the retry and hedging subsystem which will use
*
* per-method configuration. If a method is unconfigured, it will be limited to
* transparent retries, which are safe for non-idempotent RPCs. Service config is ideally provided
* by the name resolver, but may also be specified via {@link #defaultServiceConfig}.
*
* @return this
* @since 1.11.0
*/
public T enableRetry() {
throw new UnsupportedOperationException();
}
/**
* Sets the BinaryLog object that this channel should log to. The channel does not take
* ownership of the object, and users are responsible for calling {@link BinaryLog#close()}.
*
* @param binaryLog the object to provide logging.
* @return this
* @since 1.13.0
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/4017")
public T setBinaryLog(BinaryLog binaryLog) {
throw new UnsupportedOperationException();
}
/**
* Sets the maximum number of channel trace events to keep in the tracer for each channel or
* subchannel. If set to 0, channel tracing is effectively disabled.
*
* @return this
* @since 1.13.0
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/4471")
public T maxTraceEvents(int maxTraceEvents) {
throw new UnsupportedOperationException();
}
/**
* Sets the proxy detector to be used in addresses name resolution. If null is passed
* the default proxy detector will be used. For how proxies work in gRPC, please refer to the
* documentation on {@link ProxyDetector}.
*
* @return this
* @since 1.19.0
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/5113")
public T proxyDetector(ProxyDetector proxyDetector) {
throw new UnsupportedOperationException();
}
/**
* Provides a service config to the channel. The channel will use the default service config when
* the name resolver provides no service config or if the channel disables lookup service config
* from name resolver (see {@link #disableServiceConfigLookUp()}). The argument
* {@code serviceConfig} is a nested map representing a Json object in the most natural way:
*
*
*
* Json entry Java Type
*
*
* object {@link Map}
*
*
* array {@link List}
*
*
* string {@link String}
*
*
* number {@link Double}
*
*
* boolean {@link Boolean}
*
*
* null {@code null}
*
*
*
* If null is passed, then there will be no default service config.
*
*
Your preferred JSON parser may not produce results in the format expected. For such cases,
* you can convert its output. For example, if your parser produces Integers and other Numbers
* in addition to Double:
*
*
{@code @SuppressWarnings("unchecked")
* private static Object convertNumbers(Object o) {
* if (o instanceof Map) {
* ((Map) o).replaceAll((k,v) -> convertNumbers(v));
* } else if (o instanceof List) {
* ((List) o).replaceAll(YourClass::convertNumbers);
* } else if (o instanceof Number && !(o instanceof Double)) {
* o = ((Number) o).doubleValue();
* }
* return o;
* }}
*
* @throws IllegalArgumentException When the given serviceConfig is invalid or the current version
* of grpc library can not parse it gracefully. The state of the builder is unchanged if
* an exception is thrown.
* @return this
* @since 1.20.0
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/5189")
public T defaultServiceConfig(@Nullable Map serviceConfig) {
throw new UnsupportedOperationException();
}
/**
* Disables service config look-up from the naming system, which is enabled by default.
*
* @return this
* @since 1.20.0
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/5189")
public T disableServiceConfigLookUp() {
throw new UnsupportedOperationException();
}
/**
* Builds a channel using the given parameters.
*
* @since 1.0.0
*/
public abstract ManagedChannel build();
/**
* Returns the correctly typed version of the builder.
*/
private T thisT() {
@SuppressWarnings("unchecked")
T thisT = (T) this;
return thisT;
}
}