2
* Licensed to the Apache Software Foundation (ASF) under one or more
3
* contributor license agreements. See the NOTICE file distributed with
4
* this work for additional information regarding copyright ownership.
5
* The ASF licenses this file to You under the Apache License, Version 2.0
6
* (the "License"); you may not use this file except in compliance with
7
* the License. You may obtain a copy of the License at
9
* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
12
* distributed under the License is distributed on an "AS IS" BASIS,
13
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14
* See the License for the specific language governing permissions and
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package org.apache.catalina.tribes.group.interceptors;
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import static java.util.concurrent.TimeUnit.MILLISECONDS;
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import java.util.Arrays;
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import java.util.concurrent.atomic.AtomicBoolean;
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import org.apache.catalina.tribes.ChannelException;
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import org.apache.catalina.tribes.Member;
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import org.apache.catalina.tribes.group.AbsoluteOrder;
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import org.apache.catalina.tribes.group.ChannelInterceptorBase;
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* A dinky coordinator, just uses a sorted version of the member array.
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public class SimpleCoordinator extends ChannelInterceptorBase {
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private Member[] view;
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private AtomicBoolean membershipChanged = new AtomicBoolean();
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private void membershipChanged() {
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membershipChanged.set(true);
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public void memberAdded(final Member member) {
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super.memberAdded(member);
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installViewWhenStable();
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public void memberDisappeared(final Member member) {
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super.memberDisappeared(member);
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installViewWhenStable();
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* Override to receive view changes.
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protected void viewChange(final Member[] view) {
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public void start(int svc) throws ChannelException {
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installViewWhenStable();
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private void installViewWhenStable() {
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while (stableCount < 10) {
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if (membershipChanged.compareAndSet(true, false)) {
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MILLISECONDS.sleep(250);
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} catch (final InterruptedException e) {
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Thread.currentThread().interrupt();
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final Member[] members = getMembers();
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final Member[] view = new Member[members.length+1];
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System.arraycopy(members, 0, view, 0, members.length);
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view[members.length] = getLocalMember(false);
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Arrays.sort(view, AbsoluteOrder.comp);
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if (Arrays.equals(view, this.view)) {
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public void stop(int svc) throws ChannelException {
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public Member[] getView() {
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public Member getCoordinator() {
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return view == null ? null : view[0];
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public boolean isCoordinator() {
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return view == null ? false : getLocalMember(false).equals(
2
* Licensed to the Apache Software Foundation (ASF) under one or more
3
* contributor license agreements. See the NOTICE file distributed with
4
* this work for additional information regarding copyright ownership.
5
* The ASF licenses this file to You under the Apache License, Version 2.0
6
* (the "License"); you may not use this file except in compliance with
7
* the License. You may obtain a copy of the License at
9
* http://www.apache.org/licenses/LICENSE-2.0
11
* Unless required by applicable law or agreed to in writing, software
12
* distributed under the License is distributed on an "AS IS" BASIS,
13
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14
* See the License for the specific language governing permissions and
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package org.apache.catalina.tribes.group.interceptors;
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import static java.util.concurrent.TimeUnit.MILLISECONDS;
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import java.util.Arrays;
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import java.util.concurrent.atomic.AtomicBoolean;
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import org.apache.catalina.tribes.ChannelException;
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import org.apache.catalina.tribes.Member;
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import org.apache.catalina.tribes.group.AbsoluteOrder;
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import org.apache.catalina.tribes.group.ChannelInterceptorBase;
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* A dinky coordinator, just uses a sorted version of the member array.
34
public class SimpleCoordinator extends ChannelInterceptorBase {
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private Member[] view;
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private AtomicBoolean membershipChanged = new AtomicBoolean();
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private void membershipChanged() {
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membershipChanged.set(true);
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public void memberAdded(final Member member) {
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super.memberAdded(member);
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installViewWhenStable();
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public void memberDisappeared(final Member member) {
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super.memberDisappeared(member);
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installViewWhenStable();
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* Override to receive view changes.
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protected void viewChange(final Member[] view) {
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public void start(int svc) throws ChannelException {
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installViewWhenStable();
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private void installViewWhenStable() {
75
while (stableCount < 10) {
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if (membershipChanged.compareAndSet(true, false)) {
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MILLISECONDS.sleep(250);
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} catch (final InterruptedException e) {
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Thread.currentThread().interrupt();
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final Member[] members = getMembers();
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final Member[] view = new Member[members.length+1];
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System.arraycopy(members, 0, view, 0, members.length);
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view[members.length] = getLocalMember(false);
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Arrays.sort(view, AbsoluteOrder.comp);
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if (Arrays.equals(view, this.view)) {
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public void stop(int svc) throws ChannelException {
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public Member[] getView() {
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public Member getCoordinator() {
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return view == null ? null : view[0];
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public boolean isCoordinator() {
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return view == null ? false : getLocalMember(false).equals(