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LifecycleActivity.java
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LifecycleActivity.java
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package org.rapidoid.activity;
import java.util.concurrent.atomic.AtomicBoolean;
import org.rapidoid.annotation.Authors;
import org.rapidoid.annotation.Since;
import org.rapidoid.u.U;
/*
* #%L
* rapidoid-activity
* %%
* Copyright (C) 2014 - 2015 Nikolche Mihajlovski and contributors
* %%
* 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.
* #L%
*/
@Authors("Nikolche Mihajlovski")
@Since("2.0.0")
public abstract class LifecycleActivity<T> extends NamedActivity<T> {
private final AtomicBoolean active = new AtomicBoolean(false);
public LifecycleActivity(String name) {
super(name);
}
@SuppressWarnings("unchecked")
@Override
public T start() {
checkActive(false);
active.set(true);
return (T) this;
}
@SuppressWarnings("unchecked")
@Override
public T halt() {
checkActive(true);
active.set(false);
return (T) this;
}
@SuppressWarnings("unchecked")
@Override
public T shutdown() {
checkActive(true);
active.set(false);
return (T) this;
}
@Override
public boolean isActive() {
return active.get();
}
protected void checkActive(boolean active) {
if (active) {
U.must(isActive(), "The activity is not active!");
} else {
U.must(!isActive(), "The activity is already active!");
}
}
}