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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.hadoop.hbase.master;
import java.io.IOException;
import java.util.List;
import org.apache.commons.lang.ClassUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Coprocessor;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.NamespaceDescriptor;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.coprocessor.*;
import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription;
import java.io.IOException;
import java.util.List;
/**
* Provides the coprocessor framework and environment for master oriented
* operations. {@link HMaster} interacts with the loaded coprocessors
* through this class.
*/
@InterfaceAudience.Private
public class MasterCoprocessorHost
extends CoprocessorHost {
private static final Log LOG = LogFactory.getLog(MasterCoprocessorHost.class);
/**
* Coprocessor environment extension providing access to master related
* services.
*/
static class MasterEnvironment extends CoprocessorHost.Environment
implements MasterCoprocessorEnvironment {
private MasterServices masterServices;
public MasterEnvironment(final Class implClass, final Coprocessor impl,
final int priority, final int seq, final Configuration conf,
final MasterServices services) {
super(impl, priority, seq, conf);
this.masterServices = services;
}
public MasterServices getMasterServices() {
return masterServices;
}
}
private MasterServices masterServices;
public MasterCoprocessorHost(final MasterServices services, final Configuration conf) {
super(services);
this.conf = conf;
this.masterServices = services;
// Log the state of coprocessor loading here; should appear only once or
// twice in the daemon log, depending on HBase version, because there is
// only one MasterCoprocessorHost instance in the master process
boolean coprocessorsEnabled = conf.getBoolean(COPROCESSORS_ENABLED_CONF_KEY,
DEFAULT_COPROCESSORS_ENABLED);
LOG.info("System coprocessor loading is " + (coprocessorsEnabled ? "enabled" : "disabled"));
loadSystemCoprocessors(conf, MASTER_COPROCESSOR_CONF_KEY);
}
@Override
public MasterEnvironment createEnvironment(final Class implClass,
final Coprocessor instance, final int priority, final int seq,
final Configuration conf) {
for (Object itf : ClassUtils.getAllInterfaces(implClass)) {
Class c = (Class) itf;
if (CoprocessorService.class.isAssignableFrom(c)) {
masterServices.registerService(((CoprocessorService)instance).getService());
}
}
return new MasterEnvironment(implClass, instance, priority, seq, conf,
masterServices);
}
public boolean preCreateNamespace(final NamespaceDescriptor ns) throws IOException {
return execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preCreateNamespace(ctx, ns);
}
});
}
public void postCreateNamespace(final NamespaceDescriptor ns) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postCreateNamespace(ctx, ns);
}
});
}
public boolean preDeleteNamespace(final String namespaceName) throws IOException {
return execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preDeleteNamespace(ctx, namespaceName);
}
});
}
public void postDeleteNamespace(final String namespaceName) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postDeleteNamespace(ctx, namespaceName);
}
});
}
public boolean preModifyNamespace(final NamespaceDescriptor ns) throws IOException {
return execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preModifyNamespace(ctx, ns);
}
});
}
public void postModifyNamespace(final NamespaceDescriptor ns) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postModifyNamespace(ctx, ns);
}
});
}
public void preGetNamespaceDescriptor(final String namespaceName)
throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preGetNamespaceDescriptor(ctx, namespaceName);
}
});
}
public void postGetNamespaceDescriptor(final NamespaceDescriptor ns)
throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postGetNamespaceDescriptor(ctx, ns);
}
});
}
public boolean preListNamespaceDescriptors(final List descriptors)
throws IOException {
return execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preListNamespaceDescriptors(ctx, descriptors);
}
});
}
public void postListNamespaceDescriptors(final List descriptors)
throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postListNamespaceDescriptors(ctx, descriptors);
}
});
}
/* Implementation of hooks for invoking MasterObservers */
public void preCreateTable(final HTableDescriptor htd, final HRegionInfo[] regions)
throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preCreateTable(ctx, htd, regions);
}
});
}
public void postCreateTable(final HTableDescriptor htd, final HRegionInfo[] regions)
throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postCreateTable(ctx, htd, regions);
}
});
}
public void preCreateTableHandler(final HTableDescriptor htd, final HRegionInfo[] regions)
throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preCreateTableHandler(ctx, htd, regions);
}
});
}
public void postCreateTableHandler(final HTableDescriptor htd, final HRegionInfo[] regions)
throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postCreateTableHandler(ctx, htd, regions);
}
});
}
public void preDeleteTable(final TableName tableName) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preDeleteTable(ctx, tableName);
}
});
}
public void postDeleteTable(final TableName tableName) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postDeleteTable(ctx, tableName);
}
});
}
public void preDeleteTableHandler(final TableName tableName) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preDeleteTableHandler(ctx, tableName);
}
});
}
public void postDeleteTableHandler(final TableName tableName) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postDeleteTableHandler(ctx, tableName);
}
});
}
public void preTruncateTable(TableName tableName) throws IOException {
ObserverContext ctx = null;
for (MasterEnvironment env: coprocessors) {
if (env.getInstance() instanceof MasterObserver) {
ctx = ObserverContext.createAndPrepare(env, ctx);
try {
((MasterObserver)env.getInstance()).preTruncateTable(ctx, tableName);
} catch (Throwable e) {
handleCoprocessorThrowable(env, e);
}
if (ctx.shouldComplete()) {
break;
}
}
}
}
public void postTruncateTable(TableName tableName) throws IOException {
ObserverContext ctx = null;
for (MasterEnvironment env: coprocessors) {
if (env.getInstance() instanceof MasterObserver) {
ctx = ObserverContext.createAndPrepare(env, ctx);
try {
((MasterObserver)env.getInstance()).postTruncateTable(ctx, tableName);
} catch (Throwable e) {
handleCoprocessorThrowable(env, e);
}
if (ctx.shouldComplete()) {
break;
}
}
}
}
public void preTruncateTableHandler(TableName tableName) throws IOException {
ObserverContext ctx = null;
for (MasterEnvironment env : coprocessors) {
if (env.getInstance() instanceof MasterObserver) {
ctx = ObserverContext.createAndPrepare(env, ctx);
try {
((MasterObserver) env.getInstance()).preTruncateTableHandler(ctx, tableName);
} catch (Throwable e) {
handleCoprocessorThrowable(env, e);
}
if (ctx.shouldComplete()) {
break;
}
}
}
}
public void postTruncateTableHandler(TableName tableName) throws IOException {
ObserverContext ctx = null;
for (MasterEnvironment env : coprocessors) {
if (env.getInstance() instanceof MasterObserver) {
ctx = ObserverContext.createAndPrepare(env, ctx);
try {
((MasterObserver) env.getInstance()).postTruncateTableHandler(ctx, tableName);
} catch (Throwable e) {
handleCoprocessorThrowable(env, e);
}
if (ctx.shouldComplete()) {
break;
}
}
}
}
public void preModifyTable(final TableName tableName, final HTableDescriptor htd)
throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preModifyTable(ctx, tableName, htd);
}
});
}
public void postModifyTable(final TableName tableName, final HTableDescriptor htd)
throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postModifyTable(ctx, tableName, htd);
}
});
}
public void preModifyTableHandler(final TableName tableName, final HTableDescriptor htd)
throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preModifyTableHandler(ctx, tableName, htd);
}
});
}
public void postModifyTableHandler(final TableName tableName, final HTableDescriptor htd)
throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postModifyTableHandler(ctx, tableName, htd);
}
});
}
public boolean preAddColumn(final TableName tableName, final HColumnDescriptor column)
throws IOException {
return execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preAddColumn(ctx, tableName, column);
}
});
}
public void postAddColumn(final TableName tableName, final HColumnDescriptor column)
throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postAddColumn(ctx, tableName, column);
}
});
}
public boolean preAddColumnHandler(final TableName tableName, final HColumnDescriptor column)
throws IOException {
return execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preAddColumnHandler(ctx, tableName, column);
}
});
}
public void postAddColumnHandler(final TableName tableName, final HColumnDescriptor column)
throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postAddColumnHandler(ctx, tableName, column);
}
});
}
public boolean preModifyColumn(final TableName tableName, final HColumnDescriptor descriptor)
throws IOException {
return execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preModifyColumn(ctx, tableName, descriptor);
}
});
}
public void postModifyColumn(final TableName tableName, final HColumnDescriptor descriptor)
throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postModifyColumn(ctx, tableName, descriptor);
}
});
}
public boolean preModifyColumnHandler(final TableName tableName,
final HColumnDescriptor descriptor) throws IOException {
return execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preModifyColumnHandler(ctx, tableName, descriptor);
}
});
}
public void postModifyColumnHandler(final TableName tableName,
final HColumnDescriptor descriptor) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postModifyColumnHandler(ctx, tableName, descriptor);
}
});
}
public boolean preDeleteColumn(final TableName tableName, final byte [] c) throws IOException {
return execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preDeleteColumn(ctx, tableName, c);
}
});
}
public void postDeleteColumn(final TableName tableName, final byte [] c) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postDeleteColumn(ctx, tableName, c);
}
});
}
public boolean preDeleteColumnHandler(final TableName tableName, final byte[] c)
throws IOException {
return execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preDeleteColumnHandler(ctx, tableName, c);
}
});
}
public void postDeleteColumnHandler(final TableName tableName, final byte[] c)
throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postDeleteColumnHandler(ctx, tableName, c);
}
});
}
public void preEnableTable(final TableName tableName) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preEnableTable(ctx, tableName);
}
});
}
public void postEnableTable(final TableName tableName) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postEnableTable(ctx, tableName);
}
});
}
public void preEnableTableHandler(final TableName tableName) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preEnableTableHandler(ctx, tableName);
}
});
}
public void postEnableTableHandler(final TableName tableName) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postEnableTableHandler(ctx, tableName);
}
});
}
public void preDisableTable(final TableName tableName) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preDisableTable(ctx, tableName);
}
});
}
public void postDisableTable(final TableName tableName) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postDisableTable(ctx, tableName);
}
});
}
public void preDisableTableHandler(final TableName tableName) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preDisableTableHandler(ctx, tableName);
}
});
}
public void postDisableTableHandler(final TableName tableName) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postDisableTableHandler(ctx, tableName);
}
});
}
public boolean preMove(final HRegionInfo region, final ServerName srcServer,
final ServerName destServer) throws IOException {
return execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preMove(ctx, region, srcServer, destServer);
}
});
}
public void postMove(final HRegionInfo region, final ServerName srcServer,
final ServerName destServer) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postMove(ctx, region, srcServer, destServer);
}
});
}
public boolean preAssign(final HRegionInfo regionInfo) throws IOException {
return execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preAssign(ctx, regionInfo);
}
});
}
public void postAssign(final HRegionInfo regionInfo) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postAssign(ctx, regionInfo);
}
});
}
public boolean preUnassign(final HRegionInfo regionInfo, final boolean force)
throws IOException {
return execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preUnassign(ctx, regionInfo, force);
}
});
}
public void postUnassign(final HRegionInfo regionInfo, final boolean force) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postUnassign(ctx, regionInfo, force);
}
});
}
public void preRegionOffline(final HRegionInfo regionInfo) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preRegionOffline(ctx, regionInfo);
}
});
}
public void postRegionOffline(final HRegionInfo regionInfo) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postRegionOffline(ctx, regionInfo);
}
});
}
public boolean preBalance() throws IOException {
return execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preBalance(ctx);
}
});
}
public void postBalance(final List plans) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postBalance(ctx, plans);
}
});
}
public boolean preBalanceSwitch(final boolean b) throws IOException {
return execOperationWithResult(b, coprocessors.isEmpty() ? null :
new CoprocessorOperationWithResult() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
setResult(oserver.preBalanceSwitch(ctx, getResult()));
}
});
}
public void postBalanceSwitch(final boolean oldValue, final boolean newValue)
throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postBalanceSwitch(ctx, oldValue, newValue);
}
});
}
public void preShutdown() throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preShutdown(ctx);
}
@Override
public void postEnvCall(MasterEnvironment env) {
// invoke coprocessor stop method
shutdown(env);
}
});
}
public void preStopMaster() throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preStopMaster(ctx);
}
@Override
public void postEnvCall(MasterEnvironment env) {
// invoke coprocessor stop method
shutdown(env);
}
});
}
public void preMasterInitialization() throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preMasterInitialization(ctx);
}
});
}
public void postStartMaster() throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postStartMaster(ctx);
}
});
}
public void preSnapshot(final SnapshotDescription snapshot,
final HTableDescriptor hTableDescriptor) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preSnapshot(ctx, snapshot, hTableDescriptor);
}
});
}
public void postSnapshot(final SnapshotDescription snapshot,
final HTableDescriptor hTableDescriptor) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postSnapshot(ctx, snapshot, hTableDescriptor);
}
});
}
public void preCloneSnapshot(final SnapshotDescription snapshot,
final HTableDescriptor hTableDescriptor) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preCloneSnapshot(ctx, snapshot, hTableDescriptor);
}
});
}
public void postCloneSnapshot(final SnapshotDescription snapshot,
final HTableDescriptor hTableDescriptor) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postCloneSnapshot(ctx, snapshot, hTableDescriptor);
}
});
}
public void preRestoreSnapshot(final SnapshotDescription snapshot,
final HTableDescriptor hTableDescriptor) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preRestoreSnapshot(ctx, snapshot, hTableDescriptor);
}
});
}
public void postRestoreSnapshot(final SnapshotDescription snapshot,
final HTableDescriptor hTableDescriptor) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postRestoreSnapshot(ctx, snapshot, hTableDescriptor);
}
});
}
public void preDeleteSnapshot(final SnapshotDescription snapshot) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preDeleteSnapshot(ctx, snapshot);
}
});
}
public void postDeleteSnapshot(final SnapshotDescription snapshot) throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postDeleteSnapshot(ctx, snapshot);
}
});
}
public boolean preGetTableDescriptors(final List tableNamesList,
final List descriptors) throws IOException {
return execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.preGetTableDescriptors(ctx, tableNamesList, descriptors);
}
});
}
public void postGetTableDescriptors(final List descriptors)
throws IOException {
execOperation(coprocessors.isEmpty() ? null : new CoprocessorOperation() {
@Override
public void call(MasterObserver oserver, ObserverContext ctx)
throws IOException {
oserver.postGetTableDescriptors(ctx, descriptors);
}
});
}
private static abstract class CoprocessorOperation
extends ObserverContext {
public CoprocessorOperation() {
}
public abstract void call(MasterObserver oserver,
ObserverContext ctx) throws IOException;
public void postEnvCall(MasterEnvironment env) {
}
}
private static abstract class CoprocessorOperationWithResult extends CoprocessorOperation {
private T result = null;
public void setResult(final T result) { this.result = result; }
public T getResult() { return this.result; }
}
private T execOperationWithResult(final T defaultValue,
final CoprocessorOperationWithResult ctx) throws IOException {
if (ctx == null) return defaultValue;
ctx.setResult(defaultValue);
execOperation(ctx);
return ctx.getResult();
}
private boolean execOperation(final CoprocessorOperation ctx) throws IOException {
if (ctx == null) return false;
boolean bypass = false;
List envs = coprocessors.get();
for (int i = 0; i < envs.size(); i++) {
MasterEnvironment env = envs.get(i);
if (env.getInstance() instanceof MasterObserver) {
ctx.prepare(env);
Thread currentThread = Thread.currentThread();
ClassLoader cl = currentThread.getContextClassLoader();
try {
currentThread.setContextClassLoader(env.getClassLoader());
ctx.call((MasterObserver)env.getInstance(), ctx);
} catch (Throwable e) {
handleCoprocessorThrowable(env, e);
} finally {
currentThread.setContextClassLoader(cl);
}
bypass |= ctx.shouldBypass();
if (ctx.shouldComplete()) {
break;
}
}
ctx.postEnvCall(env);
}
return bypass;
}
}