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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.jrt;
import com.yahoo.concurrent.CachedThreadPoolWithFallback;
import java.util.concurrent.Executor;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
class Connector implements AutoCloseable {
private static final Object globalLock = new Object();
private static CachedThreadPoolWithFallback globalExecutor = null;
private static long usages = 0;
private static CachedThreadPoolWithFallback acquire() {
synchronized (globalLock) {
if (globalExecutor == null) {
globalExecutor = new CachedThreadPoolWithFallback("jrt.connector", 1, 64, 1L, TimeUnit.SECONDS);
}
usages++;
return globalExecutor;
}
}
private static void release(CachedThreadPoolWithFallback executor) {
synchronized (globalLock) {
assert executor == globalExecutor;
usages--;
if (usages == 0) {
globalExecutor.close();
globalExecutor = null;
}
}
}
private final AtomicReference<CachedThreadPoolWithFallback> executor;
Connector() {
executor = new AtomicReference<>(acquire());
}
private void connect(Connection conn) {
conn.transportThread().addConnection(conn.connect());
}
public void connectLater(Connection conn) {
Executor executor = this.executor.get();
if (executor != null) {
try {
executor.execute(() -> connect(conn));
return;
} catch (RejectedExecutionException ignored) {
}
}
conn.transportThread().addConnection(conn);
}
@Override
public void close() {
CachedThreadPoolWithFallback toShutdown = executor.getAndSet(null);
if (toShutdown != null) {
release(toShutdown);
}
}
}
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