forked from googleapis/gax-java
/
InstantiatingWatchdogProvider.java
120 lines (106 loc) · 4.14 KB
/
InstantiatingWatchdogProvider.java
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/*
* Copyright 2018 Google LLC
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google LLC nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.google.api.gax.rpc;
import com.google.api.core.ApiClock;
import com.google.api.core.BetaApi;
import com.google.api.core.InternalApi;
import com.google.common.base.Preconditions;
import java.util.concurrent.ScheduledExecutorService;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import org.threeten.bp.Duration;
/**
* A watchdog provider which instantiates a new provider on every request.
*
* <p>This is the internal class and is public only for technical reasons. It may change any time
* without notice, please do not depend on it explicitly.
*/
@BetaApi("The surface for streaming is not stable yet and may change in the future.")
@InternalApi
public final class InstantiatingWatchdogProvider implements WatchdogProvider {
@Nullable private final ApiClock clock;
@Nullable private final ScheduledExecutorService executor;
@Nullable private final Duration checkInterval;
public static WatchdogProvider create() {
return new InstantiatingWatchdogProvider(null, null, null);
}
private InstantiatingWatchdogProvider(
@Nullable ApiClock clock,
@Nullable ScheduledExecutorService executor,
@Nullable Duration checkInterval) {
this.clock = clock;
this.executor = executor;
this.checkInterval = checkInterval;
}
@Override
public boolean needsClock() {
return clock == null;
}
@Override
public WatchdogProvider withClock(@Nonnull ApiClock clock) {
return new InstantiatingWatchdogProvider(
Preconditions.checkNotNull(clock), executor, checkInterval);
}
@Override
public boolean needsCheckInterval() {
return checkInterval == null;
}
@Override
public WatchdogProvider withCheckInterval(@Nonnull Duration checkInterval) {
return new InstantiatingWatchdogProvider(
clock, executor, Preconditions.checkNotNull(checkInterval));
}
@Override
public boolean needsExecutor() {
return executor == null;
}
@Override
public WatchdogProvider withExecutor(ScheduledExecutorService executor) {
return new InstantiatingWatchdogProvider(
clock, Preconditions.checkNotNull(executor), checkInterval);
}
@SuppressWarnings("ConstantConditions")
@Nullable
@Override
public Watchdog getWatchdog() {
Preconditions.checkState(!needsClock(), "A clock is needed");
Preconditions.checkState(!needsCheckInterval(), "A check interval is needed");
Preconditions.checkState(!needsExecutor(), "An executor is needed");
// Watchdog is disabled
if (checkInterval.isZero()) {
return null;
}
return Watchdog.create(clock, checkInterval, executor);
}
@Override
public boolean shouldAutoClose() {
return true;
}
}