io.etcd.jetcd.support.Util Maven / Gradle / Ivy
/*
* Copyright 2016-2021 The jetcd 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.etcd.jetcd.support;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
import java.util.function.Function;
import java.util.stream.Collectors;
import io.etcd.jetcd.ByteSequence;
import io.etcd.jetcd.Constants;
import io.grpc.Metadata;
import io.grpc.stub.AbstractStub;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.protobuf.ByteString;
import static io.etcd.jetcd.common.exception.EtcdExceptionFactory.toEtcdException;
import static io.grpc.stub.MetadataUtils.newAttachHeadersInterceptor;
public final class Util {
private Util() {
}
public static List toURIs(Collection uris) {
return uris.stream().map(uri -> {
try {
return new URI(uri);
} catch (URISyntaxException e) {
throw new IllegalArgumentException("Invalid endpoint URI: " + uri, e);
}
}).collect(Collectors.toList());
}
/**
* convert ListenableFuture of Type S to CompletableFuture of Type T.
*/
public static CompletableFuture toCompletableFuture(ListenableFuture sourceFuture,
Function resultConvert,
Executor executor) {
CompletableFuture targetFuture = new CompletableFuture() {
// the cancel of targetFuture also cancels the sourceFuture.
@Override
public boolean cancel(boolean mayInterruptIfRunning) {
super.cancel(mayInterruptIfRunning);
return sourceFuture.cancel(mayInterruptIfRunning);
}
};
sourceFuture.addListener(() -> {
try {
targetFuture.complete(resultConvert.apply(sourceFuture.get()));
} catch (Exception e) {
targetFuture.completeExceptionally(toEtcdException(e));
}
}, executor);
return targetFuture;
}
public static ByteString prefixNamespace(ByteSequence key, ByteSequence namespace) {
return ByteString.copyFrom(namespace.isEmpty() ? key.getBytes() : namespace.concat(key).getBytes());
}
public static ByteString prefixNamespace(ByteString key, ByteSequence namespace) {
return namespace.isEmpty() ? key : ByteString.copyFrom(namespace.concat(key).getBytes());
}
public static ByteString prefixNamespaceToRangeEnd(ByteSequence end, ByteSequence namespace) {
if (namespace.isEmpty()) {
return ByteString.copyFrom(end.getBytes());
}
if (end.size() == 1 && end.getBytes()[0] == 0) {
// range end is '\0', calculate the prefixed range end by (key + 1)
byte[] prefixedEndArray = namespace.getBytes();
boolean ok = false;
for (int i = prefixedEndArray.length - 1; i >= 0; i--) {
prefixedEndArray[i] = (byte) (prefixedEndArray[i] + 1);
if (prefixedEndArray[i] != 0) {
ok = true;
break;
}
}
if (!ok) {
// 0xff..ff => 0x00
prefixedEndArray = new byte[] { 0 };
}
return ByteString.copyFrom(prefixedEndArray);
} else {
return ByteString.copyFrom(namespace.concat(end).getBytes());
}
}
public static ByteString prefixNamespaceToRangeEnd(ByteString end, ByteSequence namespace) {
if (namespace.isEmpty()) {
return end;
}
if (end.size() == 1 && end.toByteArray()[0] == 0) {
// range end is '\0', calculate the prefixed range end by (key + 1)
byte[] prefixedEndArray = namespace.getBytes();
boolean ok = false;
for (int i = prefixedEndArray.length - 1; i >= 0; i--) {
prefixedEndArray[i] = (byte) (prefixedEndArray[i] + 1);
if (prefixedEndArray[i] != 0) {
ok = true;
break;
}
}
if (!ok) {
// 0xff..ff => 0x00
prefixedEndArray = new byte[] { 0 };
}
return ByteString.copyFrom(prefixedEndArray);
} else {
return ByteString.copyFrom(namespace.concat(end).getBytes());
}
}
public static ByteString unprefixNamespace(ByteString key, ByteSequence namespace) {
return namespace.isEmpty() ? key : key.substring(namespace.size());
}
public static > T applyRequireLeader(boolean requireLeader, T stub) {
if (!requireLeader) {
return stub;
}
final Metadata md = new Metadata();
md.put(Constants.REQUIRE_LEADER_KEY, Constants.REQUIRE_LEADER_VALUE);
return stub.withInterceptors(newAttachHeadersInterceptor(md));
}
public static ThreadFactory createThreadFactory(String prefix, boolean daemon) {
ThreadFactory backingThreadFactory = Executors.defaultThreadFactory();
return new ThreadFactory() {
@Override
public Thread newThread(Runnable r) {
Thread t = backingThreadFactory.newThread(r);
t.setDaemon(daemon);
// set a proper name so it is easier to find out the where the thread was created
t.setName(prefix + t.getName());
return t;
}
};
}
}